Molding Process
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Deformation of PBT Products Under Static Load (Cold Flow)
Problem Phenomenon
PBT products undergo permanent deformation (cold flow/creep) under long-term static stress.
Cause Analysis
PBT still has a certain creep behavior at temperatures below Tg, and the molecular chains slowly slip under long-term stress.
Solution
Reduce the design stress level; use glass fiber reinforcement to reduce creep; select materials such as PPS when necessary.
Key Takeaway
PBT cold flow is a design consideration for long-term applications.
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