ASTM D 5419 Standard Test Method for Environmental Stress Crack Resistance (ESCR) of Threaded Plastic Closures
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ASTM D 5419 Document Information:
Title
Standard Test Method for Environmental Stress Crack Resistance (ESCR) of Threaded Plastic Closures
ASTM International
Publication Date:
Nov 10, 1995
Scope:
This test method determines the susceptibility of threaded plastic
closures to failure due to
environmental stress cracking (ESC).
Threaded plastic closures in use may contact agents that appreciably
reduce the stress at which
cracks form. Examples of such agents are: soaps, detergents, oils, and
liquid bleaches.
Other major factors that influence environmental stress crack
resistance (ESCR) of threaded plastic
closures are the closure material(s), closure design, molded-in
stress, and applied stress.
This procedure applies particularly to closures made from plastics
based on polypropylene (PP) or
polystyrene (PS). It may also apply to other polymers.
The values stated in SI units are to be regarded as the standard.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. Specific
precautionary statements are given in Section 8 and Note 2.
NOTE 1 - There are no ISO standards covering the primary subject of
this test method.
Keywords:
- closures
- environmental stress crack resistance (ESCR)
- failure
- plastic
- stress crack
- threaded plastic closures
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