Molds & Tooling
7 views
Product stress cracking
Problem Phenomenon
Fine cracks appear on the surface of PEI products during placement or use
Cause Analysis
Large internal stress generated during molding; mold temperature too low <120°C, quenching freezes the stress; the product geometry has stress concentration features such as sharp corners
Solution
Increase the mold temperature to 150-180°C to slow cooling; anneal the product after demolding at 200°C/2h to eliminate internal stress; optimize product design to avoid sharp corners and abrupt cross-section changes
Key Takeaway
Annealing is an effective method to eliminate internal stress and prevent cracking in PEI products
Was this helpful?
0 people found this helpful
Thank you for your feedback!