Material Analysis
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Unstable impact strength between batches of high impact polystyrene products
Problem Phenomenon
Impact strength test results of different product batches fluctuate greatly, sometimes qualified sometimes unqualified.
Cause Analysis
(1) Raw material batch differences, different molecular weight or rubber content
(2) Processing temperature fluctuation, different degrees of material degradation
(3) Inconsistent regrind ratio, performance fluctuation
(4) Different product internal stress, 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 regrind ratio
(4) Optimize process parameters, reduce internal stress
(5) Unify test conditions and sample preparation methods
Key Takeaway
Impact strength stability depends on raw material consistency and process stability.
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