Material Analysis
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Glass Fibre product dimensional change during long-term storage
Fenómeno do problema
Glass Fibre product after 3 months storage dimensional change ±2-3%, exceeding ±0.5% requirement
Análise das causas
Glass Fibre physical aging relaxation causes continuous dimensional change; secondary crystallization slowly changes density and dimensions; low-molecular substances slowly migrate, changing local density
Solução
1) Anneal product at 80°C/4h before leaving factory to stabilize dimensions; 2) select high molecular weight grade to reduce low-molecular substances; 3) slight crosslinking to reduce molecular chain mobility and suppress aging; 4) control storage environment temperature at 23±2°C to reduce temperature change influence
Conclusão principal
Dimensional change is caused by physical aging; annealing treatment and slight crosslinking are measures to stabilize dimensions
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