HCS2407-324 – 3M Surface Pre-Treatment AC 770 B-1

HCS2407-324 – 3M Surface Pre-Treatment AC 770 B-1

The 3M™ Aerospace Sealant AC-770 B-1 is a fast curing, low density, two-component, polysulfide sealant and is suitable for fuselage sealing and filling voids. This manganese dioxide cured sealants has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals, hydraulic fluids and petroleum products commonly used in the aircraft industry.

Manufacturer Specifications:
  • BMS5-142


The 3M™ Aerospace Sealant AC-770 B-1 is a fast curing, low density, two-component, polysulfide sealant and is suitable for fuselage sealing and filling voids. This manganese dioxide cured sealants has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals, hydraulic fluids and petroleum products commonly used in the aircraft industry.

The sealant maintains flexibility and bond strength on most metal substrates such as: aluminium, titanium, steel, stainless steel, and many coatings under extremes of temperature, weathering and stress. The mixed compound is a thixotropic paste, easily applied by spatula, extrusion gun or injection gun and exhibits superb tooling properties.

Features Include:

  • Low density
  • Fast curing
  • Less shrinkage due to low solvent formulation
  • Easy to tool

Specifications Available:

Spec OEM Name Type Class Grade Rev
BMS5-142 Boeing 2 B-1 G

Specifications Overview:

  • Manufacturer #: 3M AC770 B-1
  • Color Part A: Brown
  • Color Part B: Off-white
  • Storage: Below 80°F (27°C)
  • MSDS & Manufacturer’s Certification provided

We offer the 3M™ Surface Pre-Treatment AC-770 B-1 in the following:

  • AC 770 B-1 3.5oz two-part kit

Depending on order, packaging can vary.

  • Standard corrugated, 100% recyclable cardboard boxes (sizes vary)
  • Suspended cores (when necessary)
  • Necessary documentation for certified material

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