3M Aerospace Sealant AC-350 Class B is a fast-cure, intermediate-density, manganese dioxide cured two-component polysulfide sealant for fuel tank and fuselage applications. It is solvent free, has outstanding resistance to aviation gasoline, jet fuel and chemicals common in the aircraft industry, and maintains flexibility and bond strength on aluminium, titanium, steel, stainless steel, glass and many coatings. The mixed compound is a thixotropic paste applied by extrusion, injection gun or spatula, with superb tooling properties.
Features
- Class B-2: application life min. 2 hours; tack-free and cure time 7–8 hours (25 °C, 50% RH)
- Mix ratio 100 base : 10 accelerator by weight; mixed colour dark grey
- Solvent free; non-volatile content 98%
- Hardness 50–55 Shore A; tensile strength 260 psi, elongation 500%
- Service temperature -54 °C to +121 °C; short term up to +182 °C
- No corrosion; no crazing on acrylic or polycarbonate
Applications
- Sealing integral fuel tanks
- Repairing integral fuel tanks
- Sealing fuselages
Notes
- Heat up to 60 °C may be applied to accelerate cure.
- Shelf life: 9 months from date of packaging when stored below 27 °C in the original unopened container.
| Packing | 2 OZ or 3.5 OZ or 6 OZ or 1 Pint or 1 Qt |