An ISO 9001 logo on the supplier's website tells you almost nothing — the certificate may be expired, scoped to a different product line, or issued by a non-accredited body. This 12-item checklist is what serious procurement teams use before issuing the first PO for engineering plastics. Run through it, score the supplier, and decide whether to qualify them for production volumes or limit them to spot purchases.
Why ISO 9001 alone is not enough
ISO 9001 certifies that the supplier has a documented quality management system — it does NOT certify the product. A supplier can hold ISO 9001 and ship inconsistent material if the QMS scope excludes the production you care about. Always ask for the certificate scan, verify the issuing body is IAF-accredited, and confirm the scope covers your product (e.g. 'manufacture and CNC machining of UHMWPE and HDPE engineering plastics').
12-item pre-PO checklist
Score each item Pass/Conditional/Fail. 10+ Pass = qualify; 7-9 = conditional with audit; <7 = decline.
| # | What to verify | What to ask for | Acceptable answer |
|---|---|---|---|
| 1 | ISO 9001 certificate (current, scoped) | Scanned certificate + scope statement | Certificate < 3 years old, scope includes your product, IAF-accredited body |
| 2 | Material Test Report (MTR) per batch | Sample MTR from a recent shipment | Density, MW grade, batch heat number, ISO 9001 inspection sign-off |
| 3 | Density and molecular weight grade declaration | Spec sheet + MTR sample | Density 0.93–0.94 g/cm³ for PE-1000; MW ≥3.1×10⁶ g/mol declared |
| 4 | FDA / EU 10/2011 for food contact | Compliance letter on letterhead | Reference to FDA 21 CFR 177.1520 + EU Regulation 10/2011 |
| 5 | RoHS / REACH SVHC compliance | RoHS Declaration of Conformity + REACH SVHC statement | Latest SVHC list date (updated 2× per year), no listed substances above 0.1% w/w |
| 6 | Batch traceability via heat number | Sample batch label + traceability procedure | Heat number printed on each sheet, recorded in shipping documents |
| 7 | CoA (Certificate of Analysis) on shipment | Confirm CoA ships with goods | CoA per batch, with results vs spec, signed by QC manager |
| 8 | Tolerance declaration on cut sheets | Cut sheet sample with tolerances | DIN 16742 TG6 or equivalent stated; no 'industry standard' vague phrasing |
| 9 | CNC tolerance class (DIN 16742) | Sample machined part with FAIR | TG6 standard, TG5 on request; FAIR (first article inspection report) per part |
| 10 | Packaging and humidity protection | Packing list + photo of packaging | Sealed plastic film, edge protection, desiccant for PEEK/PA |
| 11 | Lead time guarantee in writing | Quote with lead time + late-delivery penalty clause | Lead time stated in business days from PO receipt; penalty clause acceptable |
| 12 | Incoterm clarity (FOB / CIF / DDP) | Quote with Incoterm 2020 reference | Specific port named (FOB Qingdao); responsibility split clearly stated |
Sample CoA and MTR you should receive
A proper Material Test Report (MTR) is one page per batch and includes: supplier name, product description, batch heat number, test date, density (ISO 1183), molecular weight grade declaration, tensile strength (ISO 527), notched impact (ISO 179 Charpy), abrasion index (ISO 15527), and inspector signature. A Certificate of Analysis (CoA) ships with each PO and references the relevant MTR by heat number. Both documents are part of the standard ISO 9001 quality record retention — a supplier that cannot produce them on request fails item 7 of this checklist.
Frequently Asked Questions
How do I verify the ISO 9001 certificate is genuine?
Check the issuing body's website using the certificate number. Major IAF-accredited bodies (TÜV, SGS, Bureau Veritas, BSI, DNV) all have public lookup tools. Reject certificates from unknown bodies — fake certificates are common.
What if the supplier refuses to send a sample MTR?
Decline immediately. Withholding MTR is a red flag — either the QMS does not exist, or the product fails spec. A genuine ISO 9001 supplier provides a redacted sample MTR within 24 hours.
Do I need all 12 items for a sample order?
For a sample (1–10 pieces), items 1, 2, 4 (if food contact), 7 and 12 are essential. Full checklist applies before first production PO.
Are these requirements specific to UHMWPE?
Items 1, 2, 5, 6, 7, 8, 9, 10, 11, 12 apply to all engineering plastics. Item 3 (density/MW) is UHMWPE-specific. Item 4 (FDA) applies if food contact. Substitute relevant standards for PEEK, PTFE, PA, POM.
How long should I keep the MTR and CoA?
Minimum: lifetime of the asset using the part. For pressure vessels, food equipment and pharma equipment: 10 years from last shipment, per typical regulatory requirements.