Accession Number : AD0849345

Title :   Five Year Aging of Elastomeric Vulcanizates in Panama, Alaska and Illinois.

Descriptive Note : Interim technical rept. on ten year program,

Corporate Author : ARMY WEAPONS COMMAND ROCK ISLAND IL SCIENCE AND TECHNOLOGY LAB

Personal Author(s) : Bergstrom, Edward W.

Report Date : DEC 1968

Pagination or Media Count : 42

Abstract : Vulcanizates prepared from commercially available elastomers were exposed outdoors in Alaska; Rock Island, Illinois; and the Panama Canal Zone to compare the effects of exposure to arctic, temperate, and tropic environments. Aging data collected on pads exposed as long as five years are presented as part of a planned ten year program. Results show that aging is generally more severe in Panama than in Alaska or Rock Island, although some vulcanizates showed excellent aging resistance at all three sites. Unstressed polyester urethane vulcanizates, even those containing hydrolysis inhibitors, deteriorate completely within five years in Panama. Polyether urethane vulcanizates remain relatively unaffected. (Author)

Descriptors :   *VULCANIZATES, AGING(MATERIALS), ELASTOMERS, POLYESTER PLASTICS, ISOCYANATES, PLASTICS, ENVIRONMENTAL TESTS, TROPICAL DETERIORATION, ALASKA, PANAMA, ILLINOIS, OZONE, ELONGATION, STRAIN(MECHANICS).

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE