Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1986-08-12
1988-06-14
Noland, Tom
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73838, G01N 314, G01N 3344
Patent
active
047503696
ABSTRACT:
A method and device are disclosed for the determination of the environmental stress crack resistance (ESCR) of polymer articles made from polymers such as acrylonitrile-butadiene-styrene copolymers, polycarbonate, polystyrene and blends thereof. The method and device involve the external application of stress to an unstressed test article which has been exposed to a stress cracking agent. The stress is induced by means of a weight located below the horizontal plane of the plastic article. The time between the application of stress and the cracking of the test article is measured to compute a characteristic ESCR parameter and thereby evaluate the environmental stress crack resistance of the article.
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Fisher James H.
Jacoby Philip
Amoco Corporation
Magidson William H.
Modhurst Ralph C.
Noland Tom
Tungol Maria Parrish
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