3M AC-251 B-2 Aerospace Sealant

3M Aerospace Sealant AC-251 Class B is a two-part, manganese dioxide cured, polysulfide based sealant for aircraft windshields, canopies and windows. This quick curing product is easy to tool, and the non-sag formula holds its shape on vertical and horizontal surfaces. It is effective for acrylic, glass, and polycarbonate aircraft transparencies and exterior mold line applications.

Technical Information

Product Type Specialty Sealant
Product Form Liquid

Product Information

Features:

Maintains flexibility and bond strength for reliable performance on aircraft transparencies
Contains no added solvents to prevent crazing on transparent surfaces
Formulated to resist UV degradation
Black color provides clean exterior mold lines
Non-sag formula is easy to mix and apply by injection dispenser or spatula for fast application time
Qualified to multiple aerospace material specifications