Sealants

3M Aerospace Sealant AC-370 (Class B)

SKU: AC-370

Brand: 3M

Pricing on request

Specifications

Part Number	AC-370
Material	two-part, manganese dioxide-cured polysulfide, solvent-free

Description

A quick-curing, solvent-free, two-component polysulfide sealant for repairing/sealing integral fuel tanks and sealing fuselages. It is a manganese dioxide-cured thixotropic paste that maintains flexibility and bond strength on aluminum, titanium, steel, stainless steel and many coatings. 3M has since rationalized its sealant range and this product is now listed as discontinued by several distributors.

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-370
Chemistry: two-part, manganese dioxide-cured polysulfide, solvent-free
Specific gravity: max 1.30 (standard density)
Color: base off-white, accelerator brown, mixed dark gray
Mix ratio: 100 base : 12.5 accelerator
Application life: B-1/2 (~0.5 h) and B-2 (~2 h) at 77 degF / 50% RH
Cure to 30 Shore A: B-1/2 ~6-7 h, B-2 ~8-10 h
Hardness: 50-55 Shore A
Service temperature: -65 to +250 degF (-54 to +121 degC); intermittent to +360 degF (182 degC)

Frequently asked

What are the key specifications?

Chemistry: two-part, manganese dioxide-cured polysulfide, solvent-free; Specific gravity: max 1.30 (standard density); Color: base off-white, accelerator brown, mixed dark gray; Mix ratio: 100 base : 12.5 accelerator; Application life: B-1/2 (~0.5 h) and B-2 (~2 h) at 77 degF / 50% RH; Cure to 30 Shore A: B-1/2 ~6-7 h, B-2 ~8-10 h; Hardness: 50-55 Shore A; Service temperature: -65 to +250 degF (-54 to +121 degC); intermittent to +360 degF (182 degC).

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.