Material Analysis
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Bubbles in PU elastomer casting
Problem Phenomenon
Internal bubbles of 0.5-2mm in PU elastomer cast products
Cause Analysis
Insufficient mixing and degassing; casting temperature too low, viscosity high, bubbles difficult to discharge
Solution
1) Vacuum degassing for 5-10min after mixing; 2) Increase casting temperature to 60-80°C to reduce viscosity and discharge bubbles; 3) Cast slowly to avoid air entrapment
Key Takeaway
PU casting bubbles are caused by insufficient degassing; vacuum degassing is key
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