Material Analysis
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Environmental Stress Cracking of Biaxially Oriented Polypropylene Film Products
Problem Phenomenon
The product cracks when it contacts a specific chemical medium while bearing stress.
Cause Analysis
(1) The product has residual stress, and cracking is accelerated under the action of chemical media
(2) Contact with incompatible chemical media (solvents, greases, etc.)
(3) The wall thickness of the product is uneven, and stress concentration parts are prone to cracking
(4) The molecular weight of the material is low, and the environmental stress cracking resistance is poor
(5) The service environment temperature is high, accelerating cracking
Solution
(1) Reduce the residual stress of the product (annealing treatment)
(2) Avoid contact with incompatible chemical media
(3) Optimize the product design with uniform wall thickness to reduce stress concentration
(4) Select a high molecular weight grade
(5) Reduce the service environment temperature
Key Takeaway
Environmental stress cracking is the result of the combined action of stress and chemical media.
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