Injection Molding
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Stress Cracking of PCTG Injection Molded Products
Problem Phenomenon
Cracks appear in PCTG products during use or when contacting chemicals.
Cause Analysis
Excessively fast molding cooling produces internal stress, the product design has stress concentration, and PCTG is sensitive to stress cracking by certain solvents.
Solution
Increase the mold temperature to 30-50°C; avoid sharp corners and abrupt wall thickness changes in product design; anneal at 60-70°C/2-4h after molding.
Key Takeaway
PCTG stress management is the guarantee of long-term use reliability.
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