- 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
Fast-curing window and canopy sealant AC-251 is formulated to resist UV degradation in service3M™ Aerospace Sealant AC-251 is designed to create an aesthetically pleasing and highly effective seal. Its formulation prevents crazing on adjacent transparent surfaces, making our black, non-sagging product look as good as it performs. AC-251 is designed for optimal performance when used with
3M™ Adhesion Promoter AC-137.
When mixed, 3M Aerospace Sealant AC-251 is a thixotropic paste formulated for easy application by injection gun or spatula. AC-251 provides superb tooling properties and quick cure times to help meet a wide range of production process needs. It is available as a two-part product in both kit and bulk-packaging forms, to meet a variety of application requirements. AC-251 is ideal for sealing out moisture and corrosive elements. It is available in 1/2, 1 and 2 hour work lives and typical cure times of 4, 7 and 9 hours, respectively.