Sealants

3M Aerospace Sealant AC-770 Class B

SKU: AC-770 B

Brand: 3M

Pricing on request

Specifications

Part Number	AC-770 B
Compliance	Meets AMS-S-8802; also listed to Boeing BMS 5-142 (Type II, Class B-2, Form K) by distributors

Description

A two-component, low-density, fast-curing manganese-dioxide-cured polysulfide sealant with outstanding resistance to aviation gasoline, jet fuel and other aircraft chemicals. The Class B (extrudable/fillet) grade is a thixotropic paste applied by extrusion, injection gun or spatula and is used for fuselage sealing, fuel-tank sealing, floorboard sealing and void filling, maintaining flexibility and bond strength on aluminium, titanium and steel.

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 B
Type: two-part polysulfide, manganese-dioxide cure
Class: B (extrudable/fillet sealant), thixotropic paste
Color: brown (e.g. B-2)
Grades: B-1 ~1 h application life (~6 h cure); B-2 ~2 h application life (~11 h cure)
Resistance: aviation gasoline, jet fuel, petroleum products
Substrates: aluminium, titanium, steel, stainless steel and many coatings
Compliance: Meets AMS-S-8802; also listed to Boeing BMS 5-142 (Type II, Class B-2, Form K) by distributors

Frequently asked

What are the key specifications?

Type: two-part polysulfide, manganese-dioxide cure; Class: B (extrudable/fillet sealant), thixotropic paste; Color: brown (e.g. B-2); Grades: B-1 ~1 h application life (~6 h cure); B-2 ~2 h application life (~11 h cure); Resistance: aviation gasoline, jet fuel, petroleum products; Substrates: aluminium, titanium, steel, stainless steel and many coatings.

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.