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Naftoseal MC-238 Class B is a two-component, manganese-dioxide cured polysulfide polymer system providing excellent fuel tank and fuselage seals. The B-1/2 denotes that this product has a 1/2 hour application time.

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Naftoseal MC-238 B-1/2 Fuel Tank & Fuselage Sealant

GracoRoberts P/N: V00875
From $54.14

Naftoseal MC-238 Class B is a two-component, manganese-dioxide cured polysulfide polymer system providing excellent fuel tank and fuselage seals. The B-1/2 denotes that this product has a 1/2 hour application time.

Technical Information

  • Product Type Fuel Tank Sealant

Product Information

It has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to the chemicals and petroleum products used in the aircraft industry.

Naftoseal MC-238 Class B 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. The mixed compound is a thixotropic paste easily applied by extrusion, injection gun or spatula and it has excellent tooling properties.

The curing time may be reduced considerably by increasing the temperature (up to 60 °C / 140 °F max).

Surface Preparation:

To obtain good adhesion, clean surfaces with appropriate cleaners (e.g. Chemetall's Ardrox products like Ardrox 5529 or Ardrox 5575) to remove dirt, grease and processing oils just prior to sealant application. Use lint-free rags or paper towels that are free of oil. Always pour cleaner on the cloth to avoid contamination of the cleaner supply. Clean one small area at a time, quickly wiping it dry before the cleaner's solvent evaporates to prevent redeposition of oil, wax or other contaminants. Usually, in the case of most epoxy resin primers, surfaces need not be additionally prepared with an adhesion promoter to improve adhesion. PUR and EP topcoats as well as composite components should be pre-treated by the Naftoseal MC-110 Adhesion Promoter.

Data Sheets

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Product Properties

Brand
Chemetall Naftoseal
Product Type
Fuel Tank Sealant

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