TWO YEAR AGING OF ELASTOMERIC VULCANIZATES IN PANAMA, ALASKA AND ILLINOIS.

Vulcanizates prepared from commercially available elastomers, many of which have been introduced since 1955, were exposed outdoors at Ft. Wainwright, Alaska, Rock Island, Illinois and the Panama Canal Zone to compare the effects of arctic, temperate and tropic environments over a ten year period. Un...

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Bibliographic Details
Main Author: Bergstrom,E. W.
Other Authors: ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV
Format: Text
Language:English
Published: 1965
Subjects:
Elastomers and Rubber
(*ELASTOMERS
AGING(MATERIALS))
(*VULCANIZATES
PANAMA
ILLINOIS
ALASKA
ENVIRONMENTAL TESTS
EXPERIMENTAL DATA
ANTIOXIDANTS
OZONE
TEST METHODS
Arctic
Alaska
Online Access:http://www.dtic.mil/docs/citations/AD0626697
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0626697
Description
Summary:Vulcanizates prepared from commercially available elastomers, many of which have been introduced since 1955, were exposed outdoors at Ft. Wainwright, Alaska, Rock Island, Illinois and the Panama Canal Zone to compare the effects of arctic, temperate and tropic environments over a ten year period. Unstressed test pads and bent loop oxone specimens were used. Results after two years indicate that aging is generally more severe in Panama than in Alaska or Rock Island, although some vulcanizates have shown excellent aging resistance at all three exposure sites. SE 555U high strength silicone (if unpigmented) suffers a severe loss in tensile strength when aged outdoors. Bent loop specimens of EPM (MD460), Hycar 4021 and Genthane SR, all chemically saturated elastomers, have cracked within two years in Panama (all three types) and Rock Island (EPM and Hycar 4021). (Author)

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