MIL-S-83318 Sealing Compound, Low Temperature Curing, Quick Repair Integral Fuel Tanks And Fuel Cell Cavities S/S By Sae-Ams-S-83318This specification covers a two component, temperature??resistant ??65??F to +250??F ??54??C to +120??C, low temperature 20??F minimum curing synthetic rubber compounds for quick repair of aircraft integral fuel tanks and fuel cell cavities. During application, the sealing compounds shall be a suitable, fluid consistency.

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MIL-S-83318A(USAF)

TABLE I. Curing Conditions

3.3.8  Fluid immersed curing time.  When tested in accordance with 4.9.8, the sealing compound shall have a hardness of not less than Shore A-25 after curing for 6 hours and not less than Shore A-35 after curing for 24 hours.

3.3.9  Peel strength  When tested in accordance with 4.9.9, the cured sealing compound shall have a minimum peel strength of 10 pounds per inch width for 7 day immersion and 5 pound per inch width for 70 day immersion. It shall exhibit 100 percent cohesive failure, expect for failures due to bubbles, knife cuts, and other causes that are obviously not the fault of the sealing compound.

3.3.10  Chalking.  The rating criteria for sealant chalking are:

Slight Chalk - Initial observation of white or light gray formation, usually starting at edges of the sealant.

Moderate Chalk - The white or light gray formation has spread to about 1/4 to 1/2 of the surface area.

Heavy Chalk - The white or light gray formation has spread to about 3/4 or more of the surface.

The sealant shall not chalk to a moderate or heavier level, when tested in accordance with

4.9.10 in less than 5 days.

3.3.11  Air Content (Class B only).  When tested in accordance with 4.9.11 the sealing compound shall have an air content of not more than 4 percent(%).

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