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)

4.9.10 Chalking. Four 0.125 x 0.125 x 5 inch (3 by 3 by 125 mm) specimens shall be cut from a sheet of the sealing compound that has been cured as specified in 4.7.6. The specimens shall be suspended on nylon cord in a closed glass container with 900 ml of jet references fluid conforming to AMS 2629 type II so that the specimens are totally immersed in the fluid. Aluminum foil shall be used to seal the lids of the containers. No metal items shall be allowed to be in contact with the fluid or specimens during the immersion period. The specimens shall not touch each other, so that all sides are exposed to the fluid. The immersion temperature shall be 77°F (25°C). The tests shall be started on a Wednesday and the fluid changed on the following Friday. The specimens shall be examined for

chalking on the following Monday. Remove specimens from the fluid and allow the fluid to evaporate. The specimens are not to be blotted or wiped. Examine strips in a well lighted area. Use an original specimen for comparison with the specimens under test to detect chalking.

4.9.11 Air content (Class B only). The equipment used for the air content test shall be: Sealing Cartridge 3-1/2 ounce

2.5 inch (64 mm) nozzle with a 0.125 inch (3 mm) orifice

Dasher rod with valve assembly and separate plug and ramrod from a 6 inch sectional cartridge conforming to MIL-S-38714.

The test method shall conform to the following steps and shall refer to figure 3 for the various steps:

1. Test shall be performed at standard laboratory condition: as specified in 4.6

2. Test sealant material shall be stabilized at standard conditions for at least 8 hours prior to the test.

3. Fill sealant into cartridge being careful not to introduce air. Attach a 2.5 inch (64 mm) nozzle with a 0.125 inch (3 mm) orifice to the cartridge. Cut 1.125 inch (29 mm) off the tip of the nozzle. Extrude approximately two inch (50 mm) of sealant out, to remove entrapped air.

4. Prior to starting the test, the dasher rod should have the seal ring just contacting the dasher end and the valve is not closed.

5. Insert the tip of the filled cartridge firmly into the handle of the dasher rod and deliver sealant slowly until dasher is about 3/4 full. The sealant, however, should be filled completely into the handle end of the dasher.

6. Fill the wider flange side of the plug with sealant and place the plug in the rod behind the sealant with the wide flange side toward the sealant, taking care not to entrap air. Clean off excess sealant with a gauze pad wet with methyl ethyl ketone.