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Master Bond adhesives
3M AC-370 Class B-1/2 Aerospace Sealant
Categories: Polymer; Thermoset; Polysulfide Sealant/Adhesive

Material Notes: 3M Aerospace Sealant AC-370 Class B are fast cure, low density polysulfide sealants suitable for fuel tank and fuselage applications. These two-component, manganese dioxide cured sealants are solvent free and have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum product common to the aircraft industry. 3M AC-370 Class B Sealants maintain flexibility and bond strength on most metal substrates like aluminum, titanium, stainless steel, 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. They have excellent tooling properties.

Information provided by 3M

Vendors:
Available Properties
  • Density, cured 14 days @ 50% RH
  • Volatiles
  • Brookfield Viscosity, RVF #7 sp @ 2 rpm
  • Hardness, Shore A, cured 14 days @ 50% RH
  • Tensile Strength at Break, 12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I
  • Tensile Strength at Break, Standard Cure
  • Tensile Strength at Break, Standard heat cycle (AMS)
  • Tensile Strength at Break, 12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I + 24 hrs air dry @ 49°C + standard heat cycle (AMS)
  • Tensile Strength at Break, 72 hrs at standard temperature in AMS 3021
  • Tensile Strength at Break, 72 hrs at standard temperature in AMS 3020
  • Elongation at Break, Standard heat cycle (AMS)
  • Elongation at Break, 12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I + 24 hrs air dry @ 49°C + standard heat cycle (AMS)
  • Elongation at Break, 12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I
  • Elongation at Break, Standard Cure
  • Elongation at Break, 72 hrs at standard temperature in AMS 3021
  • Elongation at Break, 72 hrs at standard temperature in AMS 3020
  • Maximum Service Temperature, Air, cured 14 days @ 50% RH
  • Maximum Service Temperature, Air, Short term, cured 14 days @ 50% RH
  • Minimum Service Temperature, Air, cured 14 days @ 50% RH
  • Cure Time
  • Tack-Free Time
  • Shelf Life
  
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Manufacturer Notes:
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Category Notes
Plastic

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