Molding Process
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Impact strength of PBT products decreases at low temperature
Problem Phenomenon
The impact strength of PBT products decreases significantly at low temperatures of -30°C to -40°C, becoming brittle.
Cause Analysis
The glass transition temperature of PBT is about 45-60°C; at low temperatures, the movement of molecular chain segments is severely restricted and the toughness decreases significantly.
Solution
Use toughened modified PBT grades (PBT/elastomer blends); avoid sharp corners and notches in product design; consider the safety factor for low-temperature applications.
Key Takeaway
PBT low-temperature brittleness is a key consideration for automotive parts.
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