Material Analysis
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Environmental stress cracking of high impact polystyrene products
Problem Phenomenon
Products crack when contacting specific chemical media while simultaneously bearing stress.
Cause Analysis
(1) Residual stress exists in the product, accelerated cracking under chemical media action
(2) Contact with incompatible chemical media (solvents, oils, etc.)
(3) Uneven product wall thickness, stress concentration areas easily crack
(4) Low material molecular weight, poor environmental stress cracking resistance
(5) High use environment temperature accelerates cracking
Solution
(1) Reduce product residual stress (annealing treatment)
(2) Avoid contact with incompatible chemical media
(3) Optimize product design, uniform wall thickness, reduce stress concentration
(4) Select high molecular weight grades
(5) Reduce use environment temperature
Key Takeaway
Environmental stress cracking is the result of the combined action of stress and chemical media.
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