Material Analysis
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Unstable impact strength between batches of polystyrene products
Problem Phenomenon
Impact strength test results of different batches fluctuate greatly, sometimes qualified and sometimes unqualified.
Cause Analysis
(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
Solution
(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
Key Takeaway
Impact strength stability depends on raw material consistency and process stability.
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