Chemetall Naftoseal® MC 780 C-1/3, Fuselage and Fuel Tank Sealant, Polysulfide Solvent, Beige

Naftoseal® MC-780 Class C is a two-component, manganese-dioxide cured polysulfide polymer system with reduced density providing excellent fuel tank and fuselage seals. It is designed for interfay surface sealing and wet riveting of fuselage components and has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to the chemicals and petroleum products used in the aircraft industry. Additionally, it was developed for a service temperature between -55 °C (-67 °F) to +130 °C (+ 266 °F) and withstand a shortterm temperature of +182 °C (+360 °F).
Naftoseal® MC-780 Class C maintains its flexibility and bond strength on most metal substrates like aluminum, stainless steel, steel, titanium, composite and many coatings under extremes of temperature, weathering and stress. Naftoseal® MC-780 Class C can be mixed by MCI-Mixer or by appropriate 2-component mixing and dosing systems.
Part number 50561596 has a minimum application time of 20 minutes. Naftoseal® MC-780 Class C combines low viscosity, for ease of mixing, with a high thixotropy giving good application characteristics. It can be effectively applied by extrusion, by injection gun, or by using a roller coating technique. The low viscosity means that it is easily squeezed from interfaying surfaces during the assembly process. It has a unique "self-filleting“ characteristic. The curing time may be reduced considerably by increasing the temperature (up to 60°C or 140°F max).

TECHNICAL INFORMATION

• FAA-NR Approved

SPECIFICATIONS

• Series: MC-780 C-1/3
• Color: Beige
• Odor/Scent: Polysulfide Solvent
• Specific Gravity: 1.35 g/cc
• Viscosity: 250 pa-s
• Temperature Rating: -67 to 266 deg F
• Shelf Life: 6 Months
• Application Time: 20 min
• Domestic/Import: Import