Accession Number : AD0747769

Title :   Carbon Black as a Heat Stabilizer in Silicone Rubber Vulcanizates.

Descriptive Note : Technical rept.,

Corporate Author : ARMY WEAPONS COMMAND ROCK ISLAND ILL WEAPONS LAB

Personal Author(s) : Williams,John A.

Report Date : APR 1972

Pagination or Media Count : 20

Abstract : This work was conducted to develop silicone rubber vulcanizates with improved heat-aging resistance for use in the fabrication of weapon components and accessories. Carbon black of different particle size was added to various types of silicone rubber; the resulting compounds were vulcanized with peroxides unaffected by the presence of carbon black. Heat stability was significantly improved by the use of SAF, FEF, FT and MT carbon black fillers in one pphr quantities. The use of small sized particles of carbon black (SAF) produced silicone vulcanizates that retained upward to 80 percent of the original tensile strength of these vulcanizates after heat aging for seven days at 600 F. A silicone vulcanizate with three pphr ferric oxide in place of carbon black retained upward to 65 percent of the original tensile strength after heat-aging seven days at 600 F. A SILICONE VULCANIZATE WITHOUT A HEAT STABILIZER CRUMBLED TO AN ASHEN RESIDUE AFTER HEAT AGING FOR THREE DAYS AT 600 F. (Author, modified-PL)

Descriptors :   (*SILICONES, *VULCANIZATION), (*CARBON BLACK, *VULCANIZATES), (*HEAT RESISTANT PLASTICS, *ELASTOMERS), ADDITIVES, PARTICLE SIZE, MECHANICAL PROPERTIES, COMPOSITE MATERIALS, TENSILE PROPERTIES, IRON OXIDES

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE