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Lab Instruments
3M AC-645 B-2 Aerospace Sealant
Categories: Polymer; Thermoset

Material Notes: 3M Aerospace Sealant AC-645 B-2 is a low density, two-component, manganese dioxide cured, liquid polysulfide polymer system. It is suitable for use in fuel tanks, fuselage hole filling, cavity filling and fuel tank filleting applications. It has outstanding resistance to jet fuel, as well as resistance to chemicals, and petroleum products common to the aircraft industry. 3M AC-645 B-2 Sealant maintains its flexibility and bond strength on most meal substrates such as aluminum, titanium, steel, stainless steel, and many coatings under extremes of temperature, weathering and stress. The mixed compound is a thixotropic paste easily applied by extrusion, injection gun or spatula. It has excellent tooling properties.

Information provided by 3M

Available Properties
  • Density, STM 40-107, cured 14 days @ 50% RH
  • Volatiles
  • Brookfield Viscosity, Accelerator, RVF #7 sp @ 10 rpm
  • Brookfield Viscosity, Base, RVF #7 sp @ 2 rpm
  • Hardness, Shore A, STM 40-107, cured 14 days @ 50% RH
  • Tensile Strength at Break, STM 40-107, Standard Cure
  • Tensile Strength at Break, STM 40-107
  • Elongation at Break, STM 40-107, Standard Cure
  • Elongation at Break, STM 40-107
  • Peel Strength, STM 40-107, Dry-Std, Alclad
  • Peel Strength, STM 40-107, JRF, Alclad
  • Peel Strength, STM 40-107, JRF, Alclad
  • Maximum Service Temperature, Air, STM 40-107, cured 14 days @ 50% RH
  • Minimum Service Temperature, Air, STM 40-107, cured 14 days @ 50% RH
  • Cure Time
  • Tack-Free Time
  • Shelf Life
Property Data

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Aluminum Castings
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