Material Analysis
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Unstable impact strength between batches of polystyrene products
Fenómeno del problema
Impact strength test results of different batches fluctuate greatly, sometimes qualified and sometimes unqualified.
Análisis de la causa
(1) Raw material batch differences, with different molecular weight or rubber content
(2) Processing temperature fluctuation, with different degrees of material degradation
(3) Inconsistent regrind proportion, causing performance fluctuation
(4) Different product internal stress, causing impact strength differences
(5) Inconsistent test conditions
Solución
(1) Establish raw material incoming inspection standards
(2) Strictly control processing temperature within the 180-240°C range
(3) Unify the regrind proportion
(4) Optimize process parameters to reduce internal stress
(5) Unify test conditions and specimen preparation methods
Conclusión clave
Impact strength stability depends on raw material consistency and process stability.
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