Chemetall Naftoseal® MC 238 A-2, Fuselage and Fuel Tank Sealant, Polysulfide, Liquid, Cream

Naftoseal® MC-238 class A is a two-component, manganese dioxide cured, liquid polysulfide polymer system providing excellent fuel tank and fuselage seals. It has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. Naftoseal® MC-238 class A maintains its flexibility and bond strength on most metal substrates like aluminum, stainless steel, steel, titanium and many coatings under extremes of temperature, weathering and stress. The mixed compound is a pourable, slightly thixotropic liquid easily applied by extrusion, injection gun, spatula or brush. It has excellent tooling properties.

Features
• Free of chrome and solvents/low in solvent content
• Low temperature flexibility
• Fast tack-free and cure times
• Good adhesion to various substrates
• Excellent chemical resistance
• High elasticity and resilience
• Good thixotropic properties, no slump

Technical Information
• AIMS 04-05-001 and 04-05-002
• MDL 6057
• NTA 65361

Specifications
• Series: MC-238 A-2
• Base Type: Polysulfide
• Form: Liquid
• Color: Cream
• Curing Time: 48 hr
• Specific Gravity: 1.5 g/cc
• Viscosity: 200 Pa-s
• Tensile Strength: 1.8 to 2.2 N/sq-mm
• Applicable Materials: Aluminum, Stainless Steel, Steel, Titanium
• Temperature Rating: -55 to 130 deg C Service
• Elongation: 270 to 330 %
• Non-Volatile Content: 92 %
• Shelf Life: 6 months
• Application Time: 2 hr
• Tack-Free Time: 14 hr

Applications
• For sealing integral fuel tanks repairing integral fuel tanks sealing fuselages