COMPRESSION SET OF ELASTOMERS AT ELEVATED TEMPERATURES

Abstract

Compression set tests (constant deflection method of ASTM D395-55) were carried out on heat re sistant rubber vulcanizates for periods as long as twenty-eight days at temperatures up to 500 F. It was found that some silicone rubbers did not have set values at elevated temperatures as low as might be expected from their excellent resistance to heat aging. Cure time was found to have a significant effect on the set of iso butylene/isoprene vulcanizates. Increased cure time resulted in lower set even though the orig inal cure time may have been optimum for other properties. Certain metal oxide additives sig nificantly lowered the set of some silicones. No one additive was found, however, which lowered the set of all four types of silicones; namely, dimethyl, methyl vinyl, fluoro and high strength. Additives which had been found previously to im prove the heat resistance of silicones proved to be ineffective in lowering set.

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Document Details

Document Type
Technical Report
Publication Date
Mar 14, 1963
Accession Number
AD0403305

Entities

People

  • E. W. Bergstrom

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Alkenes
  • Barium Oxides
  • Calcium Hydroxide
  • Department Of Defense
  • Elastomers
  • High Temperature
  • Jet Propulsion
  • Magnesium Compounds
  • Materials Laboratories
  • Materials Testing
  • Metal Oxides
  • Military Research
  • Physical Properties
  • Rubber
  • Test Methods

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Polymer Science and Engineering.
  • Snow Cover Descriptors for Reptiles and Their Illustrations.