Material Analysis
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Inspection Dispute of PEEK Aerospace Parts
Problem Phenomenon
The supplier and buyer of PEEK aerospace parts have inconsistent crystallinity determination results — the supplier's self-inspection passes while the customer's re-inspection fails — and delivery falls into dispute.
Cause Analysis
Inconsistent sampling positions, heating rates, and interpretation standards of DSC testing lead to divergent results; the crystallinity of different parts of the product itself has gradients, and single-point sampling is insufficiently representative.
Solution
①Both parties agree on the DSC test standard method and sampling position map; ②Take multi-point samples at critical cross-sections and judge by the worst value; ③Use third-party laboratory arbitration testing; ④Write the test specification into the technical agreement.
Key Takeaway
For PEEK crystallinity determination, the test standard must first be unified before discussing qualification; multi-point sampling reflects the true gradient; pre-agreement in the technical agreement can avoid delivery disputes.
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