Material Analysis
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Environmental stress cracking of polystyrene products
Fenómeno do problema
The product cracks when contacting specific chemical media while simultaneously bearing stress.
Análise das causas
(1) The product has residual stress, which accelerates cracking under the action of chemical media
(2) Contact with incompatible chemical media (solvents, oils and greases, etc.)
(3) Product wall thickness is uneven, and stress concentration areas crack easily
(4) Material molecular weight is low, and environmental stress cracking resistance is poor
(5) High service environment temperature accelerates cracking
Solução
(1) Reduce product residual stress (annealing treatment)
(2) Avoid contact with incompatible chemical media
(3) Optimize product design, with uniform wall thickness to reduce stress concentration
(4) Select high molecular weight grades
(5) Lower the service environment temperature
Conclusão principal
Environmental stress cracking is the result of the combined action of stress and chemical media.
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