Sealants

3M Aerospace Sealant AC-770 (Class B)

SKU: AC-770

Brand: 3M

Pricing on request

Specifications

Part Number	AC-770
Material	two-part, manganese dioxide-cured polysulfide, solvent-free
Compliance	Boeing BMS 5-142G, Type II, Class B (per SkyGeek distributor listings)

Description

A fast-cure, solvent-free, low-density polysulfide fuselage sealant and void filler. The manganese dioxide-cured, thixotropic paste is easily applied by extrusion, injection gun or spatula and is highly resistant to aviation fuel and other aerospace chemicals. Its ~25% lower density than traditional sealants reduces aircraft weight.

Angad Aviation supplies this 3M product with full traceability and documentation — request a quote for current pricing, pack sizes and lead time.

Brand: 3M
Part No.: AC-770
Chemistry: two-part, manganese dioxide-cured polysulfide, solvent-free
Density: low density (~25% lower than traditional sealants)
Color: base off-white, accelerator brown; mixed brown/beige
Mix ratio: ~100 base : 10 accelerator
Application life classes: B-1 (~1 h), B-2 (~2 h)
Cure: B-1 ~6 h, B-2 ~11 h
Form: thixotropic paste; extrusion/injection/spatula
Applications: fuselage sealing, void filling (also fuel-tank use)
Compliance: Boeing BMS 5-142G, Type II, Class B (per SkyGeek distributor listings)

Frequently asked

What are the key specifications?

Chemistry: two-part, manganese dioxide-cured polysulfide, solvent-free; Density: low density (~25% lower than traditional sealants); Color: base off-white, accelerator brown; mixed brown/beige; Mix ratio: ~100 base : 10 accelerator; Application life classes: B-1 (~1 h), B-2 (~2 h); Cure: B-1 ~6 h, B-2 ~11 h; Form: thixotropic paste; extrusion/injection/spatula; Applications: fuselage sealing, void filling (also fuel-tank use).

How do I get pricing and lead time?

Angad Aviation supplies this 3M product quote-first — request a quote and our team responds with current price, pack sizes, availability and lead time. Every order ships with full traceability and documentation.