Material Analysis
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CEF product dimensional change during long-term storage
Fenómeno do problema
CEF products change dimension ±2-3% after 3 months of storage, exceeding the ±0.5% requirement
Análise das causas
CEF physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; slow migration of low-molecular substances changes local density
Solução
1) Annealing treatment 80°C/4h before product shipment to stabilize dimensions; 2) Select high molecular weight grades to reduce low-molecular substances; 3) Micro-crosslinking to reduce molecular chain mobility and suppress aging; 4) Storage environment temperature controlled at 23±2°C to reduce temperature change effects
Conclusão principal
Dimensional change is caused by physical aging, annealing treatment and micro-crosslinking are measures to stabilize dimensions
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