Method and device for determining the environmental stress cracking resistance of plastic articles
US4750369A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1986 |
| Grant date | Jun 14, 1988 |
| Priority date | — |
| Expiry date | Aug 12, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0688
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.