Sealants

3M Aerospace Sealant AC-251 (Black, Class B)

SKU: AC-251

Brand: 3M

Pricing on request

Specifications

Part Number	AC-251
Material	two-part, manganese dioxide-cured polysulfide, solvent-free
Compliance	Boeing MAT-587 qualified (Class B-1/2, B-2) per distributor listing

Description

A two-part, quick-curing, solvent-free polysulfide sealant formulated for sealing aircraft windshields, canopies and windows and for exterior mold-line applications. Supplied as a black, non-sag thixotropic paste that holds its shape on vertical and overhead surfaces, does not craze, and gives excellent adhesion plus UV/weather and fuel resistance on acrylic, glass and polycarbonate transparencies.

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-251
Chemistry: two-part, manganese dioxide-cured polysulfide, solvent-free
Color: black
Form: non-sag thixotropic paste; injection gun or spatula
Application life classes: B-1/2, B-1, B-2 (~0.5 / 1 / 2 h)
Cure: ~4 h / 7 h / 9 h respectively
Substrates: acrylic, glass, polycarbonate transparencies (does not craze)
Applications: windshield, canopy and window sealing; exterior mold line
Compliance: Boeing MAT-587 qualified (Class B-1/2, B-2) per distributor listing

Frequently asked

What are the key specifications?

Chemistry: two-part, manganese dioxide-cured polysulfide, solvent-free; Color: black; Form: non-sag thixotropic paste; injection gun or spatula; Application life classes: B-1/2, B-1, B-2 (~0.5 / 1 / 2 h); Cure: ~4 h / 7 h / 9 h respectively; Substrates: acrylic, glass, polycarbonate transparencies (does not craze); Applications: windshield, canopy and window sealing; exterior mold line.

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.