Naftoseal MC-780 Class A is a two-component, manganese-dioxide cured polysulfide sealant designed for fuselage and fuel tank sealing. It provides excellent resistance to aviation gasoline, jet fuel, and chemicals used in aerospace.

It maintains flexibility and adhesion on metals (aluminum, steel, titanium), composites, and coatings under extreme conditions. Service temperature ranges from –55°C to +130°C, with short-term resistance up to +182°C.

Available in variants (A-1/2, A-1, A-2) with different working and curing times. Easy to apply by extrusion, spatula, or brush. Compatible with Techkit systems and automated mixing.

Compliant with aerospace standards, it is ideal for structural and fuel sealing applications.