Use the tool first to get an actionable recommendation. Then use the report layer to verify assumptions, compare alternatives, and lock a safer RFQ path.
Allowed range: 10 to 120 mm.
Allowed range: 0.3 to 4.0 mm.
Allowed range: -40 to 260°C (NdFeB boundary alert above 220°C).
Allowed range: 1 to 120 kg.
Allowed range: 1 to 60 months.
US snapshot March 25, 2026 for "rubber coated neodymium magnets".
"black color rubber coated neodymium magnet" remains an alias merge to one URL.
Goudsmit product guidance for normal use envelope.
Published by Goudsmit for temporary heating impact.
Arnold catalog table spans N52/N55 at 60°C up to AH grades at 220°C.
REACH Annex XVII Entry 27 boundary for prolonged skin-contact articles.
2023 Commission Communication under REACH Annex XVII Entry 27.
Directive 2011/65/EU Annex II homogeneous material limit.
Use for comparative corrosion method, not direct life guarantee.
ISO 7619-1 is withdrawn; ISO 48-4 is the published replacement.
FDA guidance to reduce magnetic interference near implanted devices.
Source set reviewed in window 2006 to 2026.
You should size with pull derating in mind and then validate hold behavior on the real coated surface, not bare steel assumptions.
Intent, product scope, and decision workflow are identical, so keeping a single canonical URL prevents duplicate-thin content and keeps decision context intact.
Arnold catalog examples show N52 (60°C, 51 MGOe) versus N35AH (220°C, 34 MGOe): thermal headroom and magnetic energy are a deliberate tradeoff, not a free upgrade.
Define RoHS scope (EEE vs non-EEE), nickel-release test method set (EN 1811/EN 12472), and salt-test pass criteria in writing before sampling.
This page always returns next actions, including non-magnetic alternatives when substrate or thermal limits make magnetic mounting unreliable.
Use this table to pick the first candidate stack before pilot testing.
| Dimension | Rubber coated | Bare Ni-Cu-Ni | Epoxy coated | Encapsulated |
|---|---|---|---|---|
| Surface protection | High (soft interface reduces paint scratching) | Low | Medium | High |
| Direct pull force on same core | Reduced by interface gap | Highest baseline | Slightly reduced | Reduced by full shell |
| Shear/slip resistance on paint | Usually higher | Lower slip control | Medium | Medium to high |
| Typical corrosion robustness | Medium to high (depends on edge integrity) | Low to medium | Medium to high | High |
| Repositioning cycle suitability | Strong fit | Weak fit | Medium fit | Medium fit |
| Best procurement use case | Anti-scratch mounting and removable fixtures | Maximum pull with no surface sensitivity | General corrosion control | Harsh splash/wet environments |
| Stage | Check | Pass rule | If fail |
|---|---|---|---|
| Input freeze | Define substrate, duty temperature, load axis, and service months. | All constraints are numeric and testable. | Do not issue RFQ; complete requirement map first. |
| Sample spec | Lock grade, overmold hardness band, and tolerance window. | Drawing + material stack approved internally. | Run design review before tooling commit. |
| Pilot test | Run pull/shear retention and vibration checks on real substrate. | Retention above target with approved safety factor. | Increase diameter or move to higher-grade/risk-control stack. |
| Environment check | Expose to expected wash/splash/salt cycle profile. | No edge failure, no unacceptable drift, corrosion within rule. | Escalate sealing strategy or switch coating family. |
| Compliance gate | Collect RoHS/REACH declarations and any customer-specific limits. | Declarations and test evidence complete for project scope. | Hold PO until evidence package is complete. |
| Scale release | Freeze QC plan: hardness, dimensions, pull baseline, visual defects. | Incoming + outgoing QC checklist signed off. | Re-open pilot with corrected process controls. |
Use this matrix to decide which standard applies, where it breaks, and what to do next.
| Decision question | Verified baseline | Applies when | Counterexample / limit | Action now |
|---|---|---|---|---|
| Can ISO 9227 hours be treated as field-life months? | ISO 9227 specifies NSS/AASS/CASS methods for comparative corrosion testing. | Comparing candidate coatings under one controlled protocol. | No universal direct conversion from chamber hours to service-life across all outdoor environments. | Use ISO 9227 for ranking and gate decisions, then bind pass/fail to your own application profile. |
| Should we keep high-energy grade at elevated temperature? | Arnold catalog example: N52 is listed at 60°C (51 MGOe), while N35AH is listed at 220°C (34 MGOe). | Thermal duty approaches grade ceiling or dwell time is long. | Picking a higher Br low-temperature grade near motor heat zones drives demagnetization risk. | Select grade from worst-case continuous temperature first, then resize geometry to recover force margin. |
| Do RoHS limits always apply to every magnet shipment? | RoHS governs electrical and electronic equipment (EEE) and currently lists 10 restricted substances. | Magnet assemblies are placed on the EU market within EEE scope. | Standalone industrial parts outside EEE scope can require a different compliance basis. | Confirm end-product category at RFQ stage and request declaration text mapped to customer market scope. |
| Which nickel-release standards should be named in RFQ? | Commission Communication C/2023/1604 references EN 1811:2023 and EN 12472:2020 under REACH Annex XVII Entry 27. | Articles may have direct and prolonged skin contact during normal use. | If skin contact is not direct/prolonged, the same release workflow may not be the right first gate. | State contact profile and test path explicitly; avoid generic “REACH compliant” wording without method IDs. |
| Is there a handling boundary for users with implants? | FDA advises keeping magnetized consumer devices at least 6 inches (15 cm) from implanted medical devices. | Operators or nearby users may carry pacemakers/ICDs. | Ignoring this in installation/maintenance instructions can create avoidable safety incidents. | Add implant-interference warning and distance rule to site SOP and maintenance instructions. |
| Topic | Status | Why still open | Action |
|---|---|---|---|
| Universal friction coefficient baseline | N/A (public cross-vendor standard not found) | Friction varies by paint chemistry, contamination, and overmold texture. | Use project-specific coefficient measured on the target substrate. |
| One-size-fits-all pull derating factor | N/A | Derating depends on thickness, geometry, and contact flatness. | Treat selector band as planning estimate and confirm with pilot tests. |
| Field-life conversion from salt spray hours | N/A | Salt spray methods are comparative, not direct life predictors. | Map hours to internal qualification gate by application class. |
| Latest consolidated REACH Entry 27 detailed wording | Pending legal confirmation | Automated extraction of the latest consolidated CELEX text is unstable at clause level in this stage. | Before PO release, legal/compliance should verify the exact current Entry 27 wording in CELEX:02006R1907. |
| Path | Best for | Main risk | Control point |
|---|---|---|---|
| Marketplace multi-vendor sourcing | Fast sample discovery and broad SKU scan. | Spec quality and QC variation across suppliers. | Use strict incoming validation and reject vague spec sheets. |
| Specialist coated-magnet supplier | Defined overmold controls and tighter risk handling. | Higher upfront alignment effort and document requirements. | Lock pilot acceptance criteria before commercial negotiation. |
| Local distributor / reseller | Short lead time for low-volume repeat SKUs. | Limited control over core grade and overmold customization. | Confirm source traceability and acceptable substitutions. |
| OEM co-development route | Custom geometry and controlled program scale-up. | Longer pre-production cycle and tooling dependency. | Stage-gate prototype and PPAP-like reviews for critical programs. |
| Risk | Trigger | Impact | Mitigation |
|---|---|---|---|
| Thermal demagnetization drift | Operating above selected grade window. | Unexpected force loss and fixture failure. | Select correct grade band and validate continuous + peak temperature. |
| False confidence from pull-only data | Ignoring shear/vibration behavior on coated surfaces. | Field slip despite acceptable static pull test. | Add shear and dynamic tests in pilot protocol. |
| Corrosion at edge or damaged overmold | Salt/wet exposure with weak sealing discipline. | Core corrosion and rapid reliability decay. | Tighten edge-quality criteria and set inspection cadence. |
| Compliance documentation gap | Missing REACH/RoHS declarations at PO stage. | Shipment hold or customer rejection. | Put compliance evidence as mandatory RFQ attachment. |
| Geometry mismatch | Small diameter requested to carry high shear load. | High local stress and unstable retention. | Increase contact area or split load across multiple magnets. |
| Misuse on non-ferrous surface | Assuming painted aluminum behaves like steel. | No meaningful hold path. | Run magnetic substrate check before design lock. |
| Scenario | Assumptions | Process | Result | Next step |
|---|---|---|---|---|
| Industrial panel fixture, weekly reposition | Painted flat steel, 45°C continuous, medium vibration, 12 kg shear target. | Tool output + 7-day pilot + one cleaning cycle. | Rubber-coated path accepted with 2.5x safety factor control. | Issue RFQ with hardness and pull baseline criteria. |
| Outdoor marine-adjacent equipment | Salt spray profile, 60°C, medium-to-high vibration. | Boundary-aware result + extended pilot to 14 days with corrosion checks. | Viable only with stricter sealing and inspection cadence. | Escalate to higher corrosion-control stack if failure appears in pilot. |
| Lightweight vehicle body trim area | Painted aluminum panel, 8 kg target shear. | Tool returns immediate boundary state. | Magnetic route rejected before sampling cost is consumed. | Switch to adhesive plate or mechanical mount option. |
| High-temperature near-motor bracket | 180°C peak cycles, high vibration, steel surface. | Thermal grade escalation + risk caution + pilot requirement. | Only UH/EH/AH route considered, with thermal dwell validation. | Run material-system review if profile approaches 220°C boundary. |
| Source | Decision use | Date marker |
|---|---|---|
| ISO 9227:2022 (Edition 5) | Defines NSS, AASS, and CASS salt spray methods for comparative corrosion assessment. | Reviewed April 21, 2026 |
| ISO 9227:2022/Amd 1:2024 | Amendment publication tracking for the same salt-spray framework. | Reviewed April 21, 2026 |
| Arnold Neo Catalog (PDF) | Grade temperature windows and representative BHmax tradeoff examples (N52 vs AH family). | Reviewed April 21, 2026 |
| RoHS Directive page (European Commission) | Scope boundary: RoHS applies to EEE and identifies the current 10 restricted substances. | Reviewed April 21, 2026 |
| SWD(2023)760 (European Commission, PDF) | Concentration-limit list used in practice context (0.1% common, cadmium 0.01%). | Reviewed April 21, 2026 |
| Commission Communication C/2023/1604 | Nickel testing standards under REACH Entry 27 (EN 1811:2023, EN 12472:2020, EN 16128:2015). | Reviewed April 21, 2026 |
| REACH consolidated text location (CELEX:02006R1907-20250901) | Current legal text location used for final clause verification before release. | Reviewed April 21, 2026 |
| Nickel Directive 94/27/EC (historical baseline, no longer in force) | Historical legal wording for the 0.5 µg/cm²/week skin-contact release threshold and coating condition. | Reviewed April 21, 2026 |
| Goudsmit rubberized pot magnets page | Temperature and practical force-change notes for rubberized magnets. | Reviewed April 21, 2026 |
| K&J Magnetics FAQ | Physical explanation for pull-force reduction from coating gap. | Reviewed April 21, 2026 |
| FDA implant-interference guidance | Handling boundary (6 in / 15 cm) for magnets near implanted medical devices. | Reviewed April 21, 2026 |
| ASTM B117-19 | Salt-spray apparatus and procedure baseline used in many supplier labs. | Reviewed April 21, 2026 |
| ASTM D2240-15(2021) | Shore hardness method reference for rubber overmold QC. | Reviewed April 21, 2026 |
| ISO 48-4:2018 | Current ISO durometer-method standard for Shore hardness. | Reviewed April 21, 2026 |
| ISO 7619-1:2010 | Marked withdrawn and points to ISO 48-4 as the newer published version. | Reviewed April 21, 2026 |
Time-sensitive references are marked with review date April 21, 2026. If your compliance scope changed after that date, re-run the verification before production approval.
Include in RFQ
Substrate type, load direction, service temperature, cycle count, and acceptance rule.
Control boundaries
Define pass/fail criteria for pull, shear, corrosion, and compliance before PO.
Keep one canonical URL
Reference this page for both canonical and alias intent to avoid split signals.