Molds & Tooling
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White Stress Marks on PEEK Surface
Problem Phenomenon
White stress marks appear at ejection or assembly-stressed locations of PEEK products, common at deep-cavity corners and ejector pin positions, affecting appearance and strength evaluation.
Cause Analysis
Local stress exceeding material yielding causes microscopic crazing, and light scattering appears white; concentrated ejection force, unsmooth demolding, and assembly interference are typical inducements; when crystallization is insufficient, the material is more prone to stress whitening.
Solution
①Optimize the ejection layout to distribute the ejection force; ②Check draft angle and polishing to eliminate sticking; ③Ensure sufficient mold temperature for complete crystallization to improve toughness; ④Design the assembly structure to avoid interference stress.
Key Takeaway
PEEK stress whitening is a direct signal of local overload; check both the de'2079851475616104453 and the crystallization state; white-marked areas should be evaluated as key strength weak points.
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