Hybrid Page: Tool + Decision Report
Arc Ferrite Magnets Suppliers Checker + Report
The arc ferrite magnets suppliers checker solves tool intent first: run a supplier screening with deterministic output, boundary notes, and next action. Lower sections add source-backed ranges, method, risk tradeoffs, and procurement controls so decisions are defensible.
Published: May 6, 2026
Evidence updated: May 6, 2026 (stage1b deep-enhance round 2: REACH Article 33 + SCIP + corrosion-test + adhesive-test + IATF governance evidence increment)
SERP reviewed: May 6, 2026
Review cadence: Re-verify SERP intent and evidence set every 6 months, or earlier when policy/material signals shift.
Distinct angle: one canonical URL for arc ferrite supplier mixed intent (checker + decision report), not split pages.
Tool Layer: Run The Supplier Fit Checker
Input geometry, duty, and assumption band. Output includes verdict, uncertainty, boundary notes, and minimum next step.
Input + Action
Defaults represent a common ferrite arc RFQ baseline. Any input change clears previous output to avoid stale decisions.
Empty state: run the checker to generate your result.
Output includes fit verdict, uncertainty, boundary conditions, and minimum continue path.
Report Summary: Core Conclusions With Numbers
Middle layer converts tool output into decision-ready conclusions, suitability boundaries, and evidence pointers.
SERP intent is transactional first, not theory-first
Top SERP is dominated by supplier listing and RFQ pages
The query pattern for arc ferrite magnets suppliers is mostly dimension + grade + quote workflows. Tool-first interaction is therefore mandatory before long-form explanation.
Suitable: Users needing a fast go/no-go signal before RFQ packaging.
Not suitable: Users expecting one fixed catalog SKU with no geometry or duty validation.
Evidence IDs: S1, S2, S3
Public ferrite grade bands do not equal supplier capability
ASTM A1054 envelope (Br about 0.2-0.5 T; HcJ 160-400 kA/m) is wider than this page default screening band
This page intentionally uses a narrower 0.40-0.45 T screening band for common motor-grade ferrite arcs. If supplier data is below that band, results can be optimistic and should be down-banded or moved to review-required.
Suitable: Teams that use grade tables as a first filter and still request lot-level process evidence.
Not suitable: Very high back-EMF density targets inside compact envelopes.
Evidence IDs: S4, S5, S6, S15
Rare-earth-free does not mean feedstock-risk-free
USGS 2026: U.S. strontium net import reliance is 100%; iron oxide pigments net import reliance is 84% (2025e)
USGS also reports strontium end-use share for ceramic ferrite magnets at 14% in the U.S., with concentrated import sources. Ferrite programs still need dual-source and timeline buffers at raw-material level.
Suitable: Programs with release milestones and supplier alternates designed up front.
Not suitable: Single-source programs that only optimize immediate unit price.
Evidence IDs: S13, S14
Compliance and material disclosure should be baked into RFQ
RoHS Annex II still applies by homogeneous material (0.1% / 0.01% Cd); ECHA Candidate List shows 253 entries (accessed May 5, 2026)
RFQ packages should include coating/binder declarations, homogeneous-material screening scope, and a dated SVHC monitoring checkpoint before pilot freeze.
Suitable: Teams with quality-gate ownership and traceable document control.
Not suitable: Projects that treat compliance as post-order paperwork.
Evidence IDs: S19, S20, S23
REACH communication, notification, and SCIP are separate obligations
Article 33 communication starts at >0.1% w/w (with 45-day consumer-response duty), while SCIP submissions have applied since January 5, 2021
Do not collapse Article 33 communication, Article 7(2) notification (>1 tonne/year), and SCIP submission into one checkbox. Supplier release should map all three with clear owner and date controls.
Suitable: Teams shipping into EU markets and needing auditable compliance handoff.
Not suitable: Projects that only request a generic REACH statement without timeline or threshold logic.
Evidence IDs: S20, S24, S25
Supplier acceptance depends on measurement method traceability
ASTM A977 warns different hysteresisgraph systems can yield non-identical results; it references IEC 60404-5 as the applicable international method
Supplier comparisons should include method ID, sensing setup, and specimen context. Br/Hcj values without method traceability are not release-decision grade evidence.
Suitable: Teams comparing multiple factories and lot-level qualification data.
Not suitable: Quote decisions based only on grade name or single-line datasheet values.
Evidence IDs: S15, S16, S17
Corrosion-hour and adhesive-MPa claims need method boundary
ISO 9227 / ASTM B117 do not set universal product pass criteria, and ASTM D1002 / D4896 treat single-lap values as comparative rather than structural design-allowable
Supplier claims such as "240 h salt spray" or single lap-shear MPa should be treated as screening signals only. Release gates still need matched specimen definition, acceptance criteria, and dynamic validation evidence.
Suitable: Teams comparing coated ferrite arc options across multiple suppliers.
Not suitable: Programs using one brochure hour value or one coupon MPa value as PO-release proof.
Evidence IDs: S26, S27, S28, S29
Secondary CTA: move from screening to action
If the checker output is directional but not release-ready, request a constrained boundary review before RFQ freeze.
Method, Evidence, And Assumptions
This section exposes how the checker logic is constructed, where data came from, and where uncertainty remains.
Method flow
Deterministic flow: inputs -> derived metrics -> boundary gates -> verdict -> action.
Tool layer assumptions
Uses ferrite arc property bands, temperature coefficient approximation, gap penalty, and retention screening to produce transparent early-stage verdicts.
Report layer role
Adds source credibility, policy context, and risk controls so users can justify next engineering and procurement actions.
Evidence register
Public sources used in this page. Data uncertainty is shown explicitly instead of hidden.
| ID | Source | Key data | Context | Date |
|---|---|---|---|---|
| S1 | AOMAGNET product page (arc ferrite listing pattern) | SERP-leading listing style uses custom-size inquiry and grade matrix, indicating RFQ-style user intent. | Supports tool-first structure and explicit input fields (OD/ID/angle/grade/duty). | Accessed May 5, 2026 |
| S2 | YOHO Magnet product listing | Supplier pages request custom dimensions, tolerance class, and process details before quote. | Confirms transactional intent and need for structured input rather than generic article-first flow. | Accessed May 5, 2026 |
| S3 | supermagnete ferrite grade explanation (standard context) | Explains ferrite grade naming under Chinese SJ standard context and cross-standard mapping caveat. | Used to justify explicit uncertainty messaging for grade-name equivalence across suppliers. | Accessed May 5, 2026 |
| S4 | Eclipse / Bunting ferrite datasheet (PDF) | Publishes Chinese and IEC ferrite property bands including ferrite arc and temperature coefficients. | Used for checker data-band defaults and thermal coefficient assumptions. | Accessed May 5, 2026 |
| S5 | Stanford Magnets ferrite properties summary | Provides grade-based Br/Hcb/Hcj/(BH)max ranges with conversion table presentation. | Used as secondary cross-check for ferrite arc band reasonableness and disclosure of range variance. | Accessed May 5, 2026 |
| S6 | Newland sintered ferrite property table (PDF mirror) | Contains multi-grade ferrite property ranges and standard cross-reference blocks. | Used to keep conservative/typical/aggressive data-band switch explicit on-page. | Accessed May 5, 2026 |
| S7 | USGS Mineral Commodity Summaries 2026 - Rare Earths | U.S. rare-earth compounds/metals net import reliance reached 67% (2025e). Import sources (2021-24): China 71%, Malaysia 13%, Japan 5%, Estonia 5%. | Used to quantify concentration exposure and trigger buffer/re-quote cadence by calendar events. | Published February 2026 (MCS 2026 updated through April 2026) |
| S8 | IEA Global Critical Minerals Outlook 2025 (overview of key minerals) | In 2035 STEPS, top-three nickel supply is projected at 85% (up from 75% in 2024); China is projected near 80% of battery-grade graphite and rare-earth refining; N-1 coverage for graphite/rare earths is only 35-40%. | Provides counterexample to base-case comfort: globally supplied does not mean resilient under largest-supplier disruption. | Published 2025, accessed May 5, 2026 |
| S9 | European Commission C(2023)7088 final (RoHS delegated directive) | States Annex II currently restricts 10 substance groups and explicitly reiterates homogeneous-material thresholds including Lead 0.1% and Cadmium 0.01%. | Used to define compliance threshold boundaries directly in RFQ and release-gate checklists. | Issued October 25, 2023, accessed May 5, 2026 |
| S10 | European Commission SWD(2023)760 (RoHS evaluation working document) | Confirms 10-substance Annex II set and concentration thresholds (0.1% for most restricted substances, 0.01% for cadmium) in homogeneous materials. | Used to separate component-level declarations from homogeneous-material lab scope. | Published December 7, 2023, accessed May 5, 2026 |
| S11 | ECHA Candidate List table (REACH Article 59 publication) | Table shows 253 Candidate List entries (accessed May 5, 2026), includes n-hexane on February 4, 2026, and notes transition to ECHA CHEM with parallel maintenance until July 2026. | Used to set SVHC refresh cadence and prevent stale declaration packets in long-cycle RFQs. | ECHA table accessed May 5, 2026 |
| S12 | ECHA Registry of SVHC intentions (n-hexane detail record) | n-hexane record shows MSC agreement date (December 9, 2025) and Candidate List inclusion date (February 4, 2026). | Used for dated compliance checkpoints and to justify quarterly declaration refresh as minimum cadence. | Accessed May 5, 2026 |
| S13 | USGS Mineral Commodity Summaries 2026 - Strontium | U.S. net import reliance is 100% (2025e). Estimated U.S. end-use split includes ceramic ferrite magnets at 14%; total import sources (2021-24) are Mexico 64%, Germany 31%, other 5%. | Adds ferrite-specific feedstock risk instead of relying only on rare-earth proxy signals. | Published February 2026 (MCS 2026 ver. 1.2 through April 2026) |
| S14 | USGS Mineral Commodity Summaries 2026 - Iron Oxide Pigments | U.S. net import reliance is 84% (2025e). Iron oxide pigments list ferrites as end use, with synthetic import sources led by China 44% and Germany 30% (2021-24). | Complements strontium data with ferrite-relevant oxide feedstock concentration signals. | Published February 2026 (MCS 2026 ver. 1.2 through April 2026) |
| S15 | ASTM A1054 (Standard Specification for Sintered Ferrite Permanent Magnets) | Scope states ferrite permanent magnets with Br from 0.2 T up to about 0.5 T and HcJ from 160 to 400 kA/m; references measurement via A977 method. | Used to define the concept boundary between standard material envelope and this page’s narrower screening band. | ASTM page accessed May 5, 2026 |
| S16 | ASTM A977/A977M (High-coercivity permanent magnet test method using hysteresigraphs) | Scope includes initial/demag/recoil curves and warns different test systems may produce non-identical values; method is suitable for bulk magnets, not thin films or unusual shapes. | Used to justify method-traceability requirements in RFQ acceptance gates. | ASTM page accessed May 5, 2026 |
| S17 | IEC 60404-5:2015 (Magnetically hard material measurement standard) | IEC webstore lists edition 3.0 published on April 16, 2015 (stability date 2028); ASTM A977 cites IEC 60404-5 as the applicable international standard. | Used to keep cross-supplier magnetic property comparison tied to internationally recognized method naming. | IEC page accessed May 5, 2026 |
| S18 | Web search snapshot (arc ferrite magnets suppliers query) | Top returned pages are predominantly supplier listings, catalog pages, and RFQ-oriented directories, indicating do-intent dominance in first-page behavior. | Used to add a structured SERP evidence table instead of relying on a few anecdotal supplier URLs. | Query run May 5, 2026 |
| S19 | ECHA news: Candidate List update (4 February 2026) | ECHA states the Candidate List now contains 253 entries and names n-hexane among additions on February 4, 2026. | Used as dated compliance baseline to avoid stale SVHC assumptions in long RFQ cycles. | Published February 4, 2026 |
| S20 | ECHA REACH Article 7(2) / substances in articles notification page | Notification conditions are explicit: above 0.1% w/w in articles and above 1 tonne/year, with notification deadline no later than six months after Candidate List inclusion. | Used to convert generic SVHC caution text into executable notification gating in supplier release checklists. | Accessed May 5, 2026 |
| S21 | IAOB About Us (IATF 16949 certification governance) | IAOB describes oversight of the IATF 16949 certification scheme and operation of a central IATF strategic database for scheme management. | Used to justify certificate-governance checks as a sourcing risk-control gate, not a marketing checkbox. | Accessed May 5, 2026 |
| S22 | AIAG PPAP 4 overview | AIAG defines PPAP as the industry standard to ensure engineering design and specification requirements are consistently met during actual production runs at production rates. | Used to add a production-consistency gate that separates sample success from repeatable supplier capability. | Accessed May 5, 2026 |
| S23 | EUR-Lex consolidated RoHS text (Directive 2011/65/EU) | Article 4 ties compliance to Annex II maximum concentration values by homogeneous material; Annex II includes 0.1% limits for most substances and 0.01% for cadmium. | Used to anchor RoHS thresholds to primary legal text rather than secondary commentary. | Consolidated text as of January 1, 2025; accessed May 5, 2026 |
| S24 | ECHA REACH Article 33 communication in the supply chain page | For Candidate List substances above 0.1% w/w in articles, suppliers must communicate safe-use information (at least substance name); consumer requests must be answered within 45 days free of charge. | Used to separate Article 33 communication duty from Article 7(2) notification duty in supplier-release workflows. | Accessed May 6, 2026 |
| S25 | ECHA SCIP overview and dissemination notices | Articles above 0.1% w/w Candidate List substance on EU market require SCIP submission since January 5, 2021; ECHA also posted dissemination delays dated January 29, 2026. | Used to add SCIP applicability boundary and dated operational-risk notes for evidence-trace workflows. | Accessed May 6, 2026 |
| S26 | ISO 9227:2022 page (salt spray tests) | ISO 9227 defines salt-spray apparatus/procedure but does not set universal specimen dimensions, exposure period, or result interpretation; these belong to product specs. | Used to avoid overclaiming cross-supplier comparability from generic hour statements. | ISO page accessed May 6, 2026 |
| S27 | ASTM B117-26 page (salt spray apparatus practice) | ASTM B117 scope excludes product-specific specimen/exposure/interpretation requirements and states stand-alone correlation to natural environment performance is often weak. | Used as U.S.-standard complement to ISO 9227 for corrosion-claim boundary controls. | ASTM page accessed May 6, 2026 |
| S28 | ASTM D1002-10(2019) single-lap adhesive shear page | ASTM D1002 marks single-lap shear as primarily comparative and warns misuse as structural design-allowable stress can cause failure; suitability across different joints requires caution. | Used to constrain direct extrapolation from adhesive coupon MPa values to rotor retention release decisions. | ASTM page accessed May 6, 2026 |
| S29 | ASTM D4896 guide for single-lap test result use | ASTM D4896 states single-lap specimens are practical/comparative but warns against using such strengths as allowable structural design stresses. | Used to reinforce dynamic-validation requirements when adhesive-only retention is considered. | ASTM page accessed May 6, 2026 |
| S30 | IATF Global Oversight: About IATF Oversight Offices | IATF lists five Oversight Offices plus Beijing administrative office and states these offices manage the IATF database and certification-body monitoring. | Used to anchor governance checks to IATF official oversight structure, not only supplier-provided certificate snapshots. | Accessed May 6, 2026 |
| S31 | IATF Global Oversight: Under Contract certification bodies | IATF states recognized certification bodies under contract are authorized to conduct IATF 16949 certification activity. | Used to add a release gate requiring active CB-status and certificate validity checks before supplier approval. | Accessed May 6, 2026 |
| S32 | IATF Stakeholder Communique SC-2026-001 (March 2026) | IATF announced formation of IATF AISBL and stated no impact to current IATF 16949 certified organizations, with certifications and oversight continuing unchanged. | Used to distinguish governance-entity updates from certificate-validity state and to prevent unnecessary requalification churn. | Issued March 2026 |
Stage1b gap audit: what changed in this round
This audit tracks prior weak spots, concrete information increments, and remaining uncertainty that is still pending confirmation.
| Gap | Before | Increment added | Remaining uncertainty | Evidence IDs |
|---|---|---|---|---|
| Ferrite feedstock risk was inferred from rare-earth proxies | Page had concentration risk framing but lacked ferrite-specific feedstock metrics. | Added USGS 2026 ferrite feedstock data: strontium net import reliance 100% with concentrated import sources, and iron oxide pigment net import reliance 84% with ferrite listed as end use. | Program-specific lead-time impact is still pending confirmation / 暂无可靠公开数据 without supplier contract terms. | S13, S14 |
| Material class boundary lacked standards envelope | Checker default band appeared standalone without explicit standards envelope context. | Added ASTM A1054 envelope context (Br and HcJ range) and clarified that page defaults are a narrower screening subset. | Supplier grade-code to A1054-class mapping remains pending confirmation in many quote packets. | S15 |
| Cross-supplier BH comparisons lacked method-traceability control | Supplier magnetic values could be compared without explicit test-system comparability checks. | Added ASTM A977 and IEC 60404-5 method references plus a standards-vs-heuristics table to separate certified method scope from tool heuristics. | Historic datasheets with missing test fixture/sensing details remain pending confirmation. | S16, S17 |
| Stress-case resilience boundary needed explicit counterexample | Base-case market comfort could be overread as disruption resilience. | Kept IEA N-1 counterexample (2035 graphite/rare-earth supply only 35-40% of N-1 demand) to separate base-case balance from disruption readiness. | Exact pass/fail under each customer demand profile requires internal demand forecasts not publicly available. | S8 |
| Compliance section lacked legal threshold precision | RoHS/REACH guidance was directional and not tied to numeric homogeneous-material limits. | Added RoHS Annex II threshold references (0.1% for most substances, 0.01% for cadmium) and 10-substance scope disclosure. | Per-layer lab decomposition plans for each supplier remain pending confirmation before release. | S9, S10 |
| SVHC timing was generic and not release-gate ready | Candidate List mention existed without dated update anchors for review cadence. | Added dated SVHC evidence markers (n-hexane inclusion on February 4, 2026) and current Candidate List size marker (253 entries, accessed May 5, 2026). | Future list additions are unknown; quarterly refresh is minimum and may need higher frequency on regulatory alerts. | S11, S12 |
| SERP intent evidence relied on a few supplier pages only | Intent framing was correct directionally but lacked first-page distribution evidence. | Added a structured SERP snapshot table showing that top returned pages are dominated by supplier/catalog or directory surfaces for this exact query. | SERP composition can shift by region/time and should be rechecked at least quarterly. | S18 |
| REACH section did not operationalize Article 7(2) notification triggers | SVHC messaging focused on list growth but did not separate communication duty from notification duty. | Added explicit trigger boundary: >0.1% w/w plus >1 tonne/year and six-month notification deadline after inclusion. | Exact threshold applicability per article still needs BOM-level mass and composition calculation. | S20 |
| Supplier release flow lacked standardized production-consistency gate | Page focused on engineering/compliance screening but not on PPAP-style production repeatability gate. | Added PPAP and IATF certification-governance references to define minimum release gates beyond quote-stage claims. | Supplier-specific PPAP level, run-at-rate evidence, and audit findings remain pending confirmation per project. | S21, S22 |
| REACH duty model still under-specified for execution | Page separated Article 7(2) notification but lacked explicit Article 33 timing and SCIP applicability boundary. | Added Article 33 communication boundary (including 45-day consumer-response duty) and SCIP applicability since January 5, 2021 for >0.1% w/w Candidate List substances on EU market articles. | BOM-level concentration and EU-market placement mapping remains pending confirmation / 暂无可靠公开数据 until project-specific material declarations are validated. | S24, S25 |
| Corrosion and adhesive claims had weak test-context boundaries | Supplier salt-spray hours and lap-shear MPa could be overread as direct lifecycle/release proof. | Added ISO 9227 + ASTM B117 boundaries for corrosion interpretation and ASTM D1002 + D4896 boundaries for single-lap adhesive data misuse. | Program-specific dynamic durability and acceptance-criteria harmonization still need project testing before release claims. | S26, S27, S28, S29 |
| IATF certificate checks lacked governance-state detail | IATF/PPAP mention existed, but process did not explicitly bind approval to active oversight and authorized CB status. | Added IATF oversight-structure evidence, under-contract CB authorization reference, and March 2026 governance communique boundary. | Supplier-specific certificate-scope matching and validity snapshots remain pending confirmation / 暂无可靠公开数据 until procurement archive is complete. | S30, S31, S32 |
SERP intent evidence snapshot (May 5, 2026)
Query-level result structure is converted into explicit page design decisions instead of anecdotal assumptions.
| Rank slice | Dominant domain type | Examples | Decision signal |
|---|---|---|---|
| 1-3 | Supplier / catalog | aomagnet.com, yohomagnet.com, couragemagnet.com | Users are usually trying to screen suppliers and move toward RFQ, not read theory-only content. |
| 4-7 | Supplier / catalog | hsmagnets.com, mpcomagnetics.com, stanfordmagnets.com | Comparison intent appears at supplier capability/detail level rather than generic definition level. |
| 8-10 | Supplier + industrial directory | aomagnet category pages, thomasnet listing pages | Directory + product-list blends indicate shortlisting behavior before formal qualification. |
Evidence ID: S18. Search-result composition is time/region sensitive and must be periodically re-validated.
Supplier release gates beyond quote match
These gates reduce false-positive supplier decisions by separating catalog fit from compliance and production-readiness evidence.
| Gate | Why it matters | Pass condition | Minimum evidence | Evidence IDs |
|---|---|---|---|---|
| SERP-intent alignment gate | If top-query behavior is transactional, a narrative-only page can miss conversion-critical user jobs. | Tool-first checker stays above fold and outputs explicit next actions by verdict state. | Snapshot showing top-result concentration in supplier/catalog surfaces for the target query. | S18 |
| IATF governance gate | Certificate badges without governance traceability can hide audit-scope or site-level mismatch risk. | Supplier certification path is tied to current IATF oversight governance, active under-contract CB status, and auditable certificate records. | IATF oversight structure references, under-contract CB status confirmation, and project-side certificate/scope validity checklist. | S30, S31, S32 |
| PPAP production-consistency gate | Sample pass does not guarantee that mass production will hold the same capability window. | Supplier can show PPAP-level evidence that design/spec requirements are consistently met at production rates. | PPAP expectation, control-plan alignment, and run-at-rate evidence in RFQ/qualification packet. | S22 |
| REACH notification boundary gate | SVHC list awareness alone is insufficient when legal notification thresholds are crossed. | Article 33 communication duty, Article 7(2) notification duty, and SCIP submission duty are explicitly separated and time-tracked in release workflow. | 0.1% w/w communication evidence, >1 tonne/year notification logic, and SCIP submission identifiers where applicable. | S19, S20, S24, S25 |
| RoHS legal-threshold gate | Component-level declarations can mask non-compliance at homogeneous-material level. | Release package cites Annex II homogeneous-material thresholds and test/declaration scope. | Primary legal text mapping (Directive 2011/65/EU Article 4 + Annex II) with material-layer evidence plan. | S23 |
| Corrosion/adhesion claim comparability gate | Brochure salt-spray hours and single-lap MPa values can be misused as lifecycle or release-proof claims. | Supplier claim must be mapped to named standard method plus product-specific specimen, exposure, and acceptance criteria. | ISO 9227 / ASTM B117 test-context disclosure and ASTM D1002 / D4896 interpretation boundary notes in RFQ packet. | S26, S27, S28, S29 |
Policy timeline signals with dates
Date-stamped events are translated into executable sourcing actions.
| Date | Signal | Decision impact | Action | Evidence IDs |
|---|---|---|---|---|
| 2024 (announced, USGS reporting) | Defense Production Act investment program included strontium nitrate/oxalate/peroxide domestic manufacturing targets. | Near-term supply can still depend on imports while domestic projects ramp. | Track project commissioning milestones and avoid single-source assumptions during ramp years. | S13 |
| 2025 (USGS strontium events) | Global strontium carbonate supply was disrupted by reduced output in China, a port explosion in Iran, and plant fire damage in Mexico. | Ferrite programs can see feedstock lead-time noise even when design assumptions stay unchanged. | Add feedstock-specific buffer and escalation triggers to RFQ and PO release plans. | S13 |
| 2025e (USGS strontium chapter) | U.S. strontium net import reliance remains 100% with concentrated import source mix. | Single-source plans can inherit upstream concentration risk despite acceptable part-level quotes. | Require at least one alternate-qualified material flow before SOP lock. | S13 |
| 2025e (USGS iron oxide pigments chapter) | Iron oxide pigments show 84% U.S. net import reliance; ferrites are listed end uses. | Ferrite programs depend on more than one upstream mineral stream and should not treat supply as single-variable. | Track both strontium and oxide exposure in procurement risk reviews. | S14 |
| 2035 scenario view (published 2025) | In IEA N-1 assessment, graphite/rare-earth remaining supply covers only 35-40% of N-1 demand. | Global balance can look adequate while disruption resilience is still weak. | Add N-1 resilience review as a separate release gate from engineering fit. | S8 |
| February 4, 2026 (ECHA update date) | ECHA Candidate List moved to 253 entries, with legal communication and notification obligations tied to inclusion date. | Compliance timelines can shift inside ongoing RFQ programs even when engineering assumptions stay fixed. | Add dated REACH checkpoint and six-month notification clock tracking in supplier release governance. | S19, S20 |
| January 29, 2026 (ECHA SCIP operational notice) | ECHA reported severe delays in SCIP dissemination process due to technical problems. | Lack of immediate public SCIP visibility is not reliable proof that no submission was made. | Request submission confirmation IDs and keep dated evidence trails in project compliance packets. | S25 |
| March 2026 (IATF stakeholder communique) | IATF announced formation of IATF AISBL and stated no change to current certified-organization validity, audit activities, or oversight model. | Governance-entity updates should not trigger unnecessary supplier requalification when certificate validity is unchanged. | Keep certificate validity checks focused on active CB status, scope match, and current certificate state. | S32 |
Compliance thresholds and applicability
Scope and numeric thresholds are separated from unknown items that still require lab or supplier evidence.
| Gate | Requirement | Boundary | Minimum action | Evidence IDs |
|---|---|---|---|---|
| RoHS threshold gate | Apply Annex II concentration limits by homogeneous material for EEE components. | Most restricted substances 0.1% by weight; cadmium 0.01% by weight. | Require supplier declaration plus test method/scope statement before pilot freeze. | S23 |
| Restricted-substance scope gate | Check full Annex II set, including four phthalates, rather than legacy six-substance-only checklists. | Current Annex II scope is 10 restricted substances/groups. | Use checklist templates that explicitly enumerate all 10 restricted entries. | S10, S23 |
| Magnetic test-method traceability gate | Do not compare Br/Hcj/(BH)max values across suppliers without declaring measurement method and sensing setup. | ASTM A977 notes that different hysteresigraph systems may produce non-identical results; ASTM A1054 points to A977 for ferrite-property characterization. | Make A977/IEC 60404-5 method identifiers and specimen context mandatory in RFQ/test reports. | S15, S16, S17 |
| SVHC freshness gate | Treat REACH Candidate List as a moving target with dated review cadence. | Evidence markers: Candidate List size 253 entries (accessed May 5, 2026) and n-hexane inclusion dated February 4, 2026. | Set quarterly minimum declaration refresh and trigger immediate recheck after official updates. | S19, S20 |
| REACH Article 33 communication gate | For articles above 0.1% w/w Candidate List substance, communicate safe-use information down supply chain immediately after inclusion and respond to consumer requests. | Minimum communicated element is substance name; consumer response timeline is within 45 days, free of charge. | Add Article 33 communication template and response-SLA owner in release checklist. | S24 |
| SCIP submission gate | For EU-market articles above 0.1% w/w Candidate List substance, submit SCIP information to ECHA. | SCIP duty applies since January 5, 2021; dissemination delays can occur and do not automatically invalidate successful submission. | Require SCIP submission identifiers and timestamped submission evidence in compliance packet. | S25 |
| Open-data evidence boundary | Do not claim release-ready compliance without lot-level binder/coating evidence. | Public sources do not provide supplier-lot decomposition or fatigue-lifecycle compliance proof for your exact BOM. | Label as pending confirmation / 暂无可靠公开数据 and run targeted lab validation before SOP. | S4, S5, S6, S9, S10, S26, S27, S28, S29 |
Standards-backed boundary vs heuristic boundary
This split prevents screening thresholds from being mistaken for release-certified limits.
| Dimension | Standards-backed statement | Boundary / condition | Page action | Evidence IDs |
|---|---|---|---|---|
| Ferrite material class envelope | ASTM A1054 scope covers commercially available sintered ferrite permanent magnets. | Published envelope in scope: Br about 0.2-0.5 T and HcJ 160-400 kA/m. | Treat this page 0.40-0.45 T band as a narrower screening subset, not a full standards envelope. | S15 |
| Magnetic property measurement comparability | ASTM A977 defines hysteresigraph method and explicitly warns that different systems can yield non-identical results. | Bulk-magnet focused scope; thin films and unusual shapes are out of scope. | Require test method details (sample geometry + sensing setup) before comparing factories. | S16 |
| International method naming | ASTM A977 points to IEC 60404-5 as an applicable international standard; IEC edition 3.0 is current on webstore metadata. | IEC publication metadata is stable to 2028, but supplier reports can still use mixed historical method names. | Force RFQ template fields for method ID and revision to reduce quote-to-quote ambiguity. | S16, S17 |
| Checker gates in this page | Thermal margin >=30 C, tip speed <=55 m/s, and retention margin >=3 MPa are screening heuristics in this tool. | No single public ASTM/IEC document defines these exact pass/fail cutoffs as universal release thresholds. | Keep these gates as stage-1 filters and label release claims as pending confirmation / 暂无可靠公开数据 until project tests close. | S4, S5, S6, S15, S16 |
| Corrosion-hour claim interpretation | ISO 9227 and ASTM B117 define controlled salt-spray environments and apparatus/procedure for corrosion testing. | Neither standard provides universal product exposure duration/pass criteria or robust stand-alone long-term life prediction. | Treat "96h/240h" values as screening inputs only and bind release decisions to product-specific acceptance criteria. | S26, S27 |
| Adhesive lap-shear value interpretation | ASTM D1002 and ASTM D4896 describe single-lap adhesive data as comparative and caution against direct structural design-allowable use. | Small coupon values can shift with adherend, process, environment, and joint geometry differences. | Keep adhesive MPa as stage-1 indicator and require dynamic retention validation for release decisions. | S28, S29 |
Boundary table
Fit/caution/fail windows define how verdict states are assigned and recovered.
| Gate | Fit | Caution | Fail | Minimum action |
|---|---|---|---|---|
| Thermal margin (screening) | >= 30 C | 15 to <30 C | < 15 C | Adjust cooling path, duty, or geometry before lock-in; do not proceed to RFQ freeze. |
| Tip speed at OD | <= 55 m/s | >55 to 75 m/s | > 75 m/s | Increase mechanical retention depth and revalidate adhesive + fixture strategy. |
| Back-EMF gap versus target | |gap| <= 10% | >10% to 18% | > 18% | Re-open pole/geometry assumptions; do not rely on grade-only change. |
| Retention margin | >= 3 MPa | 1.5 to <3 MPa | < 1.5 MPa | Move from adhesive-only to mechanical retention-backed architecture. |
| Demag risk index | <= 40 | >40 to 65 | > 65 | Collect BH loop validation and broaden supplier data before release decision. |
Known vs unknown
Unknown fields are surfaced explicitly to prevent overconfidence.
| Topic | Known | Unknown | Treatment |
|---|---|---|---|
| Ferrite arc magnetic property ranges | Public tables consistently show usable ferrite arc Br/Hcb/BHmax bands. | Exact delivered values per vendor lot, sintering route, and process capability. | Use conservative band by default until incoming data confirms uplift. |
| Thermal coefficient behavior | Public ferrite datasheets provide temperature-coefficient guidance. | Real rotor thermal gradient under end-use duty cycle. | Run thermal instrumentation before release freeze. |
| Retention durability lifecycle | Static shear benchmarks exist for adhesive systems. | Long-cycle fatigue performance for the exact rotor surface and process window. | Label as pending confirmation and execute accelerated durability validation. |
| Supply resilience over program horizon | USGS 2026 quantifies ferrite-relevant feedstock exposure (U.S. strontium import reliance 100%; iron oxide pigments import reliance 84%). | Future lead-time and pricing under regional shocks. | Maintain dual-sourcing and periodic re-plan checkpoints. |
| Cross-supplier Br/Hcj comparability | ASTM A977 states different hysteresigraph systems can return non-identical values, even on the same specimen. | Whether all supplier reports were measured with equivalent fixtures, sensing methods, and specimen context. | Require method traceability (A977/IEC 60404-5, sensing setup, sample geometry) in every quote pack. |
| RoHS homogeneous-material verification depth | RoHS Annex II thresholds apply by homogeneous material (most 0.1%, cadmium 0.01%). | Full lab decomposition coverage for each coating/binder layer is often missing at RFQ stage. | Mark as pending confirmation / 暂无可靠公开数据 until supplier test scope and lot trace are delivered. |
| SVHC list drift during long RFQ cycles | ECHA Candidate List shows 253 entries (accessed May 5, 2026), including n-hexane added on February 4, 2026. | Which additional SVHC entries may be added before SOP for the exact binder/coating chemistry. | Require quarterly declaration refresh and event-triggered recheck after official list updates. |
| Supplier production-consistency evidence | AIAG positions PPAP as the industry standard to demonstrate consistent compliance with design/spec requirements at production rates. | Actual PPAP depth, run-at-rate outcome, and audit observations for each shortlisted supplier. | Keep supplier release status as pending confirmation / 暂无可靠公开数据 until project-side PPAP and site evidence are reviewed. |
| Salt spray hour comparability across suppliers | ISO 9227 and ASTM B117 define controlled salt-spray test environments but leave product-specific exposure duration and pass/fail interpretation to product specifications. | Whether different supplier "hours passed" claims are based on comparable specimens, acceptance criteria, and evaluation methods. | Mark as pending confirmation / 暂无可靠公开数据 until test plans and acceptance criteria are harmonized across suppliers. |
| IATF certificate governance and validity checks | IATF oversight offices manage database/governance and only IATF-recognized CBs under contract are authorized for IATF 16949 activity. | Whether each shortlisted supplier certificate is current, scope-matched, and linked to an active authorized CB at release time. | Require project-side validity checks and archive dated evidence before PO release. |
Pending-confirmation boundary
Supplier-lot Cpk distribution, full coating/binder layer decomposition, and long-cycle retention fatigue evidence are not reliably available in public datasets. They remain pending confirmation / 暂无可靠公开数据 until project-specific validation is completed.
Comparison And Tradeoffs
Compare ferrite arc path with nearby options before locking architecture or procurement assumptions.
Material and architecture comparison
Data bands and recommendations are screening-level and must be validated per supplier lot.
| Option | Br band | (BH)max band | Thermal behavior | Cost signal | Use when | Avoid when |
|---|---|---|---|---|---|---|
| Single-supplier ferrite arc path | 0.40-0.45 T | 31-38 kJ/m3 | Can be robust when hotspot margin and retention process are tightly controlled | Low unit price, higher concentration risk | Program volume is moderate and supplier process capability is already validated | Program has tight launch windows with no qualified backup source |
| Dual-supplier ferrite arc path | 0.38-0.40 T | 27-31 kJ/m3 | Stable if both suppliers align on thermal and magnetization tests | Slightly higher coordination cost | Need schedule resilience and policy-shock buffer | Tooling package is incomplete or tolerance handoff is not controlled |
| Barium-substitution fallback path | Project-specific | Project-specific | USGS notes barium can substitute for strontium in ferrite magnets but with reduced maximum operating temperature. | Context dependent; can diversify feedstock but may increase thermal derating cost | Supply continuity risk is dominant and duty temperature allows verified derating. | Thermal margin is already tight or high-temperature duty is mandatory. |
| Ferrite arc + finishing partner | Supplier dependent | Supplier dependent | Depends on coating/cure consistency and incoming inspections | Medium | Need coating flexibility and shorter finishing lead-time | No clear ownership for coating qualification and cure windows |
| Ferrite + rare-earth split architecture | Mixed by subsystem | Mixed by subsystem | High where needed, ferrite economics where possible | Medium to high | Need compact high-density nodes plus cost-controlled auxiliaries | Program cannot manage multi-material validation complexity |
Scenario outcomes
Scenario-based interpretation keeps the checker actionable across real operating contexts.
| Scenario | Input pattern | Likely outcome | Next action |
|---|---|---|---|
| Baseline supplier-ready RFQ pack | OD72/ID54, arc24deg, 12 segments, 3600 rpm, explicit tolerance + test scope | Usually fit when thermal and retention margins are healthy and tolerance ownership is explicit. | Package RFQ with tolerance and magnetization-direction details. |
| High-ambient duty with rushed timeline | OD84/ID62, 4200 rpm, ambient55C, rise90C, target lead-time < 30 days | Often review-required due to compressed thermal margin and schedule risk. | Prioritize cooling-path assumptions and retention architecture before PO timing. |
| Compact high-speed architecture | OD66/ID52, 6800 rpm, narrow gap, high adhesive requirement | Tip-speed and demag-risk may trigger not-fit unless geometry or duty is relaxed. | Evaluate geometry resize or NdFeB/hybrid fallback in parallel. |
| Supplier switch without full process transfer | Supplier transfer attempted with incomplete process-capability and coating validation pack | Result often lands in review-required because lot consistency evidence is missing. | Run transfer-PFMEA, lot capability checks, and first-article gate before PO release. |
| Single-source plan under policy shock (counterexample) | Engineering fit is acceptable, but procurement assumes one approved source with no timeline buffer | Execution risk can still be high when feedstock disruptions or largest-supplier shock scenarios are applied; schedule slips may appear even without geometry changes. | Run dual-source qualification and define re-quote trigger points tied to policy and feedstock updates. |
Risk Register
Decision risk is mapped by probability, impact, trigger, and executable mitigation path.
Risk matrix
Visual priority map for engineering and sourcing teams.
High impact/high probability risks should be converted into release gates, not advisory notes.
Risk details
| Risk | Probability | Impact | Trigger | Mitigation |
|---|---|---|---|---|
| Grade label mismatch across supplier standards | Medium | High | Ferrite arc grade declared without full Br/Hcb/Hcj report and batch statistics | Request BH data with test conditions and accept/reject limits. |
| Thermal demag under real duty | Medium | High | Hotspot or rotor-surface temperature higher than model assumptions in sustained duty | Instrument prototype, validate margin under worst-case ambient and duty cycle. |
| Adhesive-only retention failure at high speed | Low | High | Retention margin below 3 MPa or cure-window/process variability | Add mechanical retention features and process control checkpoints. |
| Policy-driven procurement disruption | Medium | High | Feedstock disruption events or policy shocks while U.S. strontium import reliance remains 100% and iron-oxide imports remain high | Dual-source strategy, timeline buffers, and feedstock-level re-quote cadence tied to dated events. |
| False confidence from global base-case supply headlines | Medium | High | Program planning reads base-case balance only and ignores feedstock concentration plus disruption scenarios | Run N-1 procurement drills and keep validated fallback BOM paths plus alternate feedstock flow checks. |
| Compliance disclosure gaps | Medium | Medium | Missing RoHS/REACH declarations for coating or binder systems | Make declaration pack a release gate in RFQ checklist. |
| Sample-to-mass-production drift | Medium | High | Supplier sample passes, but process capability at production rate is not evidenced or controlled. | Require PPAP-grade submission, run-at-rate evidence, and update control plan before volume release. |
| Corrosion-hour claim over-interpretation | Medium | High | Supplier comparison uses only "96h/240h salt spray" claims without aligned specimen type, acceptance criteria, and chamber control context. | Tie acceptance to product-specific corrosion criteria and aligned ISO 9227/ASTM B117 test definitions. |
| Certification governance blind spot | Low | High | Approval relies on static certificate screenshots without checking active CB under-contract status or certificate validity scope. | Run IATF certificate validity and CB-status checks in every release cycle and record evidence IDs in RFQ pack. |
Risk disclosure
This page is a screening and decision-support surface. It does not replace full electromagnetic, thermal, mechanical, reliability, and compliance validation.
FAQ By Decision Intent
Grouped FAQ keeps mixed do+know intent actionable across engineering, procurement, and compliance workflows.
Intent Clarification (Do + Know)
Engineering Boundaries
Sourcing, Compliance, And Execution
Related internal pages
Contextual links strengthen discoverability and prevent duplicate route fragmentation.
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Arc ferrite magnet factory checker and report
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Arc earth magnets checker and report
90 degree arc magnets intent checker
89mm arc magnets neodymium checker
Main CTA: send your supplier RFQ package
Include checker result, geometry drawing, tolerance, duty-cycle assumptions, and compliance declarations in one request.
Minimum package: OD/ID/axial length, angle, segment count, magnetization direction, tolerance, and coating/binder details.
If thermal margin is under 30 C, include measured hotspot assumptions and cooling path in the same inquiry.
If back-EMF gap exceeds ±10%, mark it as architecture review required before quote lock.
Attach RoHS/REACH declarations and lot test expectation to avoid late-stage compliance delays.
Minimum continue path when blocked
If inputs or evidence are incomplete, use the smallest executable path: lock conservative assumption band, validate thermal and retention checkpoints, rerun checker, and submit a constrained RFQ.
Need adjacent context before RFQ?