Material Drying
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PBT injection molded product dimensions change with ambient humidity
Problem Phenomenon
The dimensions of PBT products change in humid environments, and the insertion and extraction force of electrical connectors fluctuates.
Cause Analysis
Although PBT has a low moisture absorption rate (<0.1%), it still has a certain moisture absorption expansion in high-humidity environments, and the product thickness and shape affect the dimensional change.
Solution
Use glass fiber reinforced PBT to reduce moisture absorption expansion; conduct environmental testing and verification on key dimensions; use alternative materials such as PPS when necessary.
Key Takeaway
Although PBT moisture absorption expansion is not large, precision applications still need attention.
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