Injection Molding
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Stress corrosion cracking of pump casings
Problem Phenomenon
Cracks and leakage appear in chemical pump casings
Cause Analysis
Large internal stress from injection, contact with chemicals (ESC), and abrupt wall thickness changes
Solution
Annealing 140C 2h, uniform wall thickness transition, select high molecular weight
Key Takeaway
Annealing is an effective means to eliminate stress
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