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)

3.3.14            Tensile strength and elongation

3.3.15            Low temperature flexibility

3.3.16            Hydrolytic stability

3.3.17            Corrosion

3.3.18            Repairability

3.3.19            Accelerated storage stability

3.3.20            Long term storage b.   Application requirements:

3.3.3              Viscosity of base compound

3.3.4              Flow (Classes B material only)

3.3.5              Application time

3.3.6              Tack-free time

3.3.7              Cure time

3.3.8              Fluid immersed curing time

3.3.1  Specific gravity.  When tested in accordance with 4.9.1, the specific gravity of the cured sealing compound shall be 1.65 maximum.

3.3.2  Nonvolatile content.  When tested in accordance with 4.9.2, the nonvolatile content of the freshly mixed sealing compound shall be 87 percent  by weight for Class A and 92 percent by weight for Class B, minimum.

3.3.3  Viscosity of base compound.  When tested in accordance with 4.9.3, the viscosity of the base compound shall be 1000 to 4000 poises (100 to 400 Pa.s) for Class A material and

8000 to 14000 poises (800 to 1400 Pa.s) for Class B material.

3.3.4  Flow (Classes B material only)  When tested in accordance with 4.9.4, freshly mixed sealing compound shall exhibit an initial flow within the limits of 0.1 inch to 0.75 inch (2.5 to

19.0 mm).

3.3.5  Application time.  When tested in accordance with 4.9.5, the mixed sealing compound shall have an application time consistent with their dash number classifications. Application time is defined as that time after which the compound extrusion rate drops to 100 grams per minute for Class A and 15 grams per minute for Class B material.

3.3.6  Tack-free time.  When tested in accordance with 4.9.6, the mixed sealing compound shall cure to a tack-free condition in not more than the time in hours specified in table I.

3.3.7  Cure time.  When tested in accordance with 4.9.7. the mixed sealing compound shall have a hardness of not less than Shore A-30 after curing at the temperature and times specified in table I.

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