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)

c. Immediately transfer the cleaned panels to a deoxidizing solution consisting of the following:

Butyl alcohol - 35 percent by weight

Distilled or deionized water - 22 percent by weight

Isopropyl alcohol - 25 percent by weight

(H3PO4) 85 by weight - 18 percent by weight

Acid deoxidizer conforming to MIL-C-38334 may also be used. Allow the panels to remain in the above solution for 3 to 5 minutes. Rinse the panels thoroughly under flowing tap water.

4.7.1.3 Coating application (immersion). Transfer the deoxidized panels immediately to the chemical conversion coating solution conforming to MIL-C-81706. Immerse the panels in the solution at standard temperature for 3 to 5 minutes or until a light straw color develops. (Color development time will vary with aluminum alloy being conversion coated.) After removal from conversion coating solution, immediately rinse thoroughly in flowing distilled or deionized water. Arrange the panels in an upright position to permit them to drain dry.

Apply test materials to the conversion coated surfaces within 48 hours.

NOTE: Mix the conversion coating solution in either 18-8 stainless steel, polyethylene or other compatible plastic containers. DO NOT MIX IN GLASS CONTAINERS.

4.7.2 Preparation of sealing compound

4.7.2.1 Sealing compound preparation. Sealing compound shall be prepared by machine mixing sectional-type (MIL-S-38714) containers in accordance with the manufacturers instructions, for the following tests:

a. Application time b. Tack-free time c. Cure time

d. Fluid immersion curing time

e. Fluid rupture resistance f. Accelerated storage

The rest of the samples shall be prepared from the 3 quarts of the sealing compound and shall be hand mixed in accordance with the manufacturer's instructions. The mixed sealing compound shall have a minimum inclusion of air. Where applicable, the sealing compound, immediately after mixing, shall be placed into cartridges for extrusion from a sealant gun.