Material Analysis
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CMC product long-term storage dimensional change
Problem Phenomenon
After the CMC product is stored for 3 months, the size changes ±2-3%, exceeding the ±0.5% requirement
Cause Analysis
Physical aging relaxation of CMC causes continuous dimensional changes; secondary crystallization slowly changes the density and size; low-molecular substances slowly migrate and change the local density
Solution
1) Anneal the product at 80°C/4h before leaving the factory to stabilize the size; 2) Select high-molecular-weight grades to reduce low-molecular substances; 3) Slight crosslinking to reduce molecular chain mobility and inhibit aging; 4) Control the storage environment temperature at 23±2°C to reduce the influence of temperature changes
Key Takeaway
Dimensional change is caused by physical aging; annealing treatment and slight crosslinking are the measures to stabilize the size
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