Check part geometry and tooling allocation, then prepare an evidence-led factory inquiry. Supplier capability and pricing require confirmation.
By FerriteCustom Editorial Team. First recorded . Reviewed . This is an editorial procurement guide, not a factory audit report or a quotation. Public source abstracts and a manufacturer technical note support the cited scope; drawing-specific capabilities remain unknown.
Use this editorial workflow to ask who controls each operation. A factory may purchase powder or subcontract finishing; document that chain rather than assuming every operation must be owned on-site.
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| Operation | Evidence to request | Question to resolve |
|---|---|---|
| Powder sourcing / preparation | Chemical identity, powder supplier and batch record | Who makes the powder? If purchased, how is its lot retained? |
| Pressing and alignment | Part drawing, orientation and trial sample | Which process and magnetization direction can this plant support? |
| Sintering | Named kiln site, lot log and trial dimensional report | Which stages are subcontracted? What is the demonstrated lot capacity? |
| Grinding / finishing | Named ground faces, datums and inspection method | Which dimensions need grinding, and what is its quoted yield allowance? |
| Magnetizing / testing | Agreed pole pattern, material and assembly tests | How do sample measurements connect to the shipped lot? |
| Release / packaging | Lot CoA, retained sample and packing agreement | Who approves release and owns corrective action? |
Compare evidence and accountability across direct plants, distributors and trading firms. Request the actual production address and a lot-linked evidence pack before committing to a trial order.
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| Gate | Request | Boundary / next step |
|---|---|---|
| Site identity | Legal entity, actual production address and certificate scope | Independent verification against issuer records and a live/site audit |
| Process ownership | Process map with in-house and outsourced steps | Name each sub-tier; agree change notification and lot traceability |
| Kiln capacity | Schedule, recent lot logs and constraints for the actual part | A kiln photograph does not prove available production capacity |
| Tool ownership | Die number, matched drawing, maintenance and access terms | An existing die may still need modification or a setup charge |
| Measurement | Lot-linked reports, calibration and agreed method | Correlate buyer and factory measurement setups before acceptance |
| Quality response | Defect handling, containment and corrective action record | Define responsibility across all subcontracted steps |
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| Route | Use in the RFQ discussion | Limit |
|---|---|---|
| Wet aligned route | Discuss for a specified anisotropic target | Confirm orientation, achievable grade and actual cycle/quote on drawing |
| Dry unoriented route | Discuss for a specified isotropic target | Cannot promise an aligned target from an unoriented process |
| Other aligned routes | Ask the plant about its supported equipment | Wet/dry and isotropic/anisotropic are different dimensions; not an exhaustive process list |
| Unsure of target | Send assembly geometry, pole pattern and field needs | Keep route unresolved until magnetic requirements are agreed |
Define linear shrinkage for each measured axis as s = (Lgreen − Lfired) / Lgreen. Cavity scaling is Ltarget / (1 − s). For independent axes, volume loss is 1 − (1 − sx)(1 − sy)(1 − sz). These are geometric identities, not a firing recipe.
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| Input / calculation | Example result | Use / boundary |
|---|---|---|
| Target 100 mm, linear shrinkage 10% | Cavity = 100/0.9 = 111.11 mm | Example only; obtain measured per-axis trial shrinkage |
| 10% linear shrinkage in all three axes | Volume loss = 1 − 0.9³ = 27.1% | Cannot label 10% linear shrinkage as 10% volume loss |
| Actual anisotropic pressing and firing | Shrinkage by axis: not established | Plant must validate process, powder, orientation and dimensions |
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| Finish / feature | Specify | Cost or misuse risk |
|---|---|---|
| As-sintered | Ask whether trial dimensions meet the functional fit | Avoid finishing where proven unnecessary; do not assume universal percentages |
| Diamond ground | Name each face, tolerance and datum on the drawing | Add finishing cost only where it improves fit or assembly repeatability |
| Precision lapped | Specify flatness, parallelism and finish separately | Confirm the extra operation and inspection justify the cost |
| Edge condition | Agree chamfer/radius and allowable chip size | Test handling and assembly to reduce brittle-edge damage |
Use a material specification and an agreed measurement method. See IEC 60404-8-1:2023 and IEC 60404-5:2015 for their respective public scopes; the licensed standards and supplier data are needed for detailed contractual acceptance.
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| Data item | What to request | Decision risk |
|---|---|---|
| Ba/Sr chemistry | Named composition / supplier declaration | Commercial grade labels alone do not verify chemical identity |
| Br | Minimum remanence in mT at stated temperature | Not the same measurement as air-gap or surface flux |
| Hcb and Hcj | Separate minima in kA/m and demagnetization curves | Avoid treating normal and intrinsic coercivity as interchangeable |
| (BH)max | Minimum energy product in kJ/m³ with method | Compare like-for-like measurement conditions |
| Assembly test | Field/flux or functional result at agreed positions | Validate the intended circuit, clearances and pole pattern |
Hard-ferrite intrinsic coercivity decreases as temperature falls. That makes cold-start reverse fields a relevant check; it does not establish a fixed failure temperature or a safe permeance coefficient for every part. The supplier’s grade-specific curves and an assembly test are the next step. Basis: Arnold TN 0302: Using Permanent Magnets at Low Temperature.
Tooling allocation = buyer-entered tooling quote ÷ first-batch quantity. Annual demand remains a forecast. The tool does not infer a material-price benchmark, manufacturing margin, MOQ or lead time. Blank tooling cost means unknown; an explicit zero means the buyer entered a zero-fee quote.
Compare recurring part cost, tooling/setup, finishing, inspection, packaging, freight and duties separately using a named delivery term and place. Commodity background such as USGS Mineral Commodity Summaries 2026 cannot replace a magnet-grade supplier quote.
Prepare your factory RFQ with the evaluatorHypothetical examples show how the tool handles inputs. These are not customer case studies, measured plant yields or commercial quotations.
Sources checked 2026-10-27. Public summaries establish topic scope only. Commercial and audit actions on this page are editorial recommendations; the sources do not verify FerriteCustom’s plant ownership or certifications.
Publication / version: 2023-09-20
Publisher summary covers permanent-magnet property specifications and dimensional tolerances.
Limit: The public abstract does not verify this supplier, any Ba/Sr grade equivalence or specific part tolerance.
Publication / version: 2015-04-16
Publisher summary identifies methods for magnetic measurements, demagnetization curves and recoil lines.
Limit: Agree the test temperature, specimen and acceptance limits. No universal test uncertainty is asserted here.
Publication / version: rev.2015a
Manufacturer technical note explains that hard-ferrite intrinsic coercivity decreases in the cold.
Limit: General hard-ferrite behavior; obtain the chosen barium grade’s curves. It does not establish a universal safe load line.
Publication / version: 2024-02-18
Explains assessment of contaminants contributed by water-contact materials and components.
Limit: This overview is not a certification of a magnet or encapsulated assembly. Verify the applicable current edition and listing.
Publication / version: 2025-11-26; application dates must be checked
Sets out toy-safety requirements, material-category migration limits and transition provisions.
Limit: Confirm the applicable legislation, transition dates and test method with the destination-market laboratory. Composition alone cannot establish conformity.
Publication / version: 2026-02-06
Industry and mineral-supply context, including barite.
Limit: Not a quote for magnet-grade barium carbonate, finished magnets or a fixed savings percentage against strontium.
Publication / version: Regulation 2025/2509; general application 2030-08-01
Explains the transition from Directive 2009/48/EC to Regulation (EU) 2025/2509, generally applicable from 1 August 2030.
Limit: The regulation entered into force on 1 January 2026; some provisions apply earlier. Confirm the applicable product and shipment requirements with the destination-market laboratory.
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| Risk / missing information | Current evidence | Minimum next action |
|---|---|---|
| Plant capability / yield | Unknown until drawing trial and capacity review | Run a representative lot; agree scrap, sampling and acceptance terms |
| Unit price / tooling / lead time | Supplier quote required; no live quote feed | Request dated currency, validity, die fee, finishing, minimum batch and delivery place |
| Ba versus Sr cost advantage | No verified fixed percentage or carbonate benchmark | Compare equivalent drawings and validated grades on contemporaneous quotes |
| Magnetic temperature limits | Grade, geometry and reverse-field dependent | Request hot/cold curves and assembly verification; no universal safe Pc or service temperature |
| Toy / water-contact compliance | End use, accessibility, market and final assembly dependent | Obtain current applicable testing; substitution or overmolding needs its own evaluation |
| Freight and duties | Unknown route, shipment date and destination | Obtain a lane-specific quote; use a named delivery term and place |
For toy or water-contact use, confirm the applicable market and final assembly requirements. Neither RoHS/REACH conformity, toy safety nor drinking-water suitability follows automatically from the ceramic formula. Substitution with strontium and encapsulation are design options to evaluate, not automatic approval. Scope references: EU Toy Safety Regulation (EU) 2025/2509; NSF: Drinking Water System Components — Health Effects.
For EU toys, Regulation (EU) 2025/2509 entered into force on 1 January 2026 and generally applies from 1 August 2030, with specified provisions applying earlier. Check the transition from Directive 2009/48/EC for the intended shipment. See the European Commission: Toy safety in the EU overview.
Send a dimensioned drawing, pole direction, magnetic minima, operating temperatures and quantities. Ask the manufacturer to identify the production site, outsourced operations, lot-linked test records, tooling terms and a dated quote. Use the evaluator to prepare the geometry and tooling-allocation portion of that RFQ.
As an editorial procurement checklist, verify the entity, production address, process map, named subcontractors and a lot’s path from kiln to inspection report. Independently check any certificate scope. A photo alone cannot establish ownership, capacity or product quality.
Potentially, if your purchasing policy allows it and responsibilities, actual producer identity, change control and lot evidence are clear. Evaluate demonstrated control; kiln or calciner ownership is not a universal quality guarantee.
No. Request the supplier’s current certificate, verify the issuer, site and scope, and agree customer-specific documentation. A checklist or selected PPAP request is not evidence that the supplier is certified.
Do not assume equivalence or barium chemistry from a label. Compare the actual supplier datasheets, composition and agreed magnetic minima. The tool asks for the required orientation rather than inventing a grade conversion.
Start with the magnetic target. The tool suggests a wet aligned route for anisotropic requests and a dry unoriented route for isotropic requests. This is a discussion aid; other aligned processes exist and the supplier must validate the drawing and grade.
Linear shrinkage is (green dimension − fired dimension) / green dimension. A target fired dimension requires a green dimension of target/(1 − shrinkage). Determine each axis from trial data; linear and volumetric shrinkage are different quantities.
No. Service approval depends on the grade, temperature-dependent demagnetization curve, magnetic circuit and opposing fields. Ask for application-specific hot and cold testing rather than treating a Curie point as a safe operating limit.
No. It calculates nominal volume and illustrative mass for fully defined simple solids, plus tooling allocation from a quote you enter. Actual unit price, MOQ, die availability and lead time require a dated supplier response.
Annual demand is a forecast, not a committed order. Dividing a tooling fee by first-batch pieces shows an explicit allocation assumption. Change the batch to match your contract; separate recurring piece costs and other charges.
No automatic conformity is established here. Request the material declaration and applicable current product/market evidence. Toy accessibility, material category and final assembly matter; substituting strontium or adding plastic does not alone establish safety.
Have the final product, materials and exposure conditions reviewed against the destination market’s applicable requirements. Request evidence for the actual assembly and any encapsulation. The NSF overview explains the health-effects scope; it does not certify this magnet or establish the current applicable edition.
Include the full drawing, pole direction, magnetic minima, operating temperature range, first batch, annual forecast, destination and documentation needs. Request a dated quote and a plant evidence pack; capability, availability and certification must be confirmed in the response.
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