Method and apparatus for determining the environmental stress cr

Details Method and apparatus for determining the environmental stress cr Method and apparatus for determining the environmental stress cr

1990-02-27

1991-03-26

Myracle, Jerry W.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73 37, G01N 1908

Patent

active

050019350

ABSTRACT:
A method and apparatus for determining the environmental stress crack resistance of plastic articles, such as polyethylene terephthalate containers, are provided. In accordance with the method of the invention, the internal chamber of a hollow plastic article is pressurized, the exterior of the base is then exposed to an environmental stress cracking agent, and it is then determined if crazing and/or changes in the base clearance of the plastic article have occurred. Subsequent increases in pressure and subsequent exposures and determinations yield information on the environmental stress cracking characteristics of the container.

REFERENCES:
patent: 3710616 (1973-01-01), Smith et al.
patent: 4107979 (1978-08-01), Saeda et al.
patent: 4285230 (1981-08-01), Hartness
patent: 4829839 (1989-05-01), Fisher et al.
ASTM-D-2561-70, "Standard Test Method for Environmental Stress-Crack Resistance of Blow-Molded Polyethylene Containers", pp. 302-307 (Reapproved 1984).

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