Accession Number : AD0626697

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

Descriptive Note : Technical rept.,

Corporate Author : ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV

Personal Author(s) : Bergstrom,E. W.

Report Date : SEP 1965

Pagination or Media Count : 32

Abstract : 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)

Descriptors :   (*ELASTOMERS, AGING(MATERIALS)), (*VULCANIZATES, AGING(MATERIALS)), PANAMA, ILLINOIS, ALASKA, ENVIRONMENTAL TESTS, EXPERIMENTAL DATA, ANTIOXIDANTS, OZONE, TEST METHODS

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE