Molds & Tooling
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PETG product stress cracking
Problem Phenomenon
Cracks appear in PETG products during storage or use, especially when contacting solvents or subjected to bending stress.
Cause Analysis
Molding internal stress too large (cooling too fast or mold temperature too low), stress concentration at abrupt wall thickness changes, environmental stress cracking (ESC).
Solution
Increase the mold temperature to 30-50°C; design the product to avoid sharp corners and abrupt wall thickness changes; anneal at 60-70°C for 2-4h.
Key Takeaway
PETG environmental stress cracking sensitivity needs management from mold temperature, product design and post-processing.
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