Accession Number : AD0869573

Title :   Improved Hydrofluorocarbon Integral Fuel Tank Sealants.

Descriptive Note : Technical rept. Apr 66-Dec 68,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Anspach, W. F.

Report Date : DEC 1969

Pagination or Media Count : 38

Abstract : High temperature integral fuel tank filleting sealants based on a variety of hydrofluorocarbon polymers have been prepared. These sealants exhibit good mechanical properties at high and room temperatures both before and after aging in hydrocarbon fuel and fuel vapors at temperatures up to 550 F. Adhesion to metal substrates is good and samples have resisted loss of adhesion and rupture when pressurized at 500 F for 1000 hours. The limitations of the sealants are also discussed with emphasis on the susceptibility of titanium substrates to stress corrosion while in contact with the sealant. Efforts to minimize these problems through compounding and polymer modification are described. Whereas early sealants cracked Ti-13-11-3 alloys in laboratory evaluations in 10 to 15 hours, new compounds withstand stress cracking for 300 to 400 hours in an accelerated test. (Author-PL)

Descriptors :   (*SEALING COMPOUNDS, FUEL TANKS), (*FUEL SEALS, HALOGENATED HYDROCARBONS), MECHANICAL PROPERTIES, FLUORINE COMPOUNDS, TEMPERATURE, AGING(MATERIALS), VAPORS, SUBSTRATES, ADHESION, TITANIUM ALLOYS, STRESS CORROSION, POLYMERS, COMPATIBILITY, FUELS, HYDROCARBONS, HIGH TEMPERATURE, REINFORCING MATERIALS, FILLING, AIRCRAFT EQUIPMENT, HEAT RESISTANT MATERIALS, PROPENES, GELS, COPOLYMERIZATION, LOW TEMPERATURE, MOLECULAR WEIGHT, CURING AGENTS, VISCOSITY, SYNTHETIC RUBBER.

Subject Categories : Adhesives, Seals and Binders
      Containers and Packaging

Distribution Statement : APPROVED FOR PUBLIC RELEASE