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)

4.7.2.2 Quantity of sealing compound. Unless otherwise specified, the quantity of sealing compound required for qualification conformance tests shall be prepared by machine mixing sectional-type (MIL-S-38714) containers in accordance with the manufacturer's instructions.

4.7.3 Cleaning of test panels.

4.7.3.1 Cleaning of all test panels. All test panels shall be cleaned by scrubbing and rinsing using MIL-C-38736 solvent and AMS 3819 cleaning cloths which are free of sizing or any other contaminant. The panels shall be wiped dry immediately with clean AMS 3819 cloths.

NOTE: When organic coatings specified for the test panels, the coatings shall be fully cured as defined by the applied coating specification before cleaning. The applied coatings shall be at least 14 days old and a maximum of 6 months old when stored at ambient indoor temperatures.

4.7.3.2 Special cleaning of stainless steel and titanium peel strength panels. Stainless steel panels and titanium panels that are used for peel strength testing have to receive special cleaning. The special cleaning shall be scrubbing with abrasive mats and MIL-C-38736 solvent. After scrubbing, the panels shall be rinsed using MIL-C-38736 solvent and clean gauze. The panels shall be wiped dry. The abrasive mats shall conform to MIL-A-9962, type I, class I, grade A for the stainless steel and MIL-A-9962, type III, Class 1, grade A for the titanium.

4.7.4 AMS 3100 adhesion promoter. When specified, the panel surface shall be treated with AMS 3100 adhesion promoter. This shall be done immediately after the panel has been cleaned. The adhesion promoter shall be applied by wetting a clean AMS 3819 cloth with adhesion promoter and wiping the surface. Allow the AMS 3100 to air dry at least 30 minutes but not more than two hours before applying sealant. If more than two hours have elapsed, re-clean and re-apply the AMS 3100 before applying sealant.

4.7.5 Application of sealing compound. Unless otherwise specified herein, test panels shall be given an application of sealing compound to produce a coating having total thickness of

0.125 inch +0.016 (3 +0.5mm) cured.

4.7.6 Cure of sealing compound. The sealing compound shall be cured for 14 days at 77°F (25°C) and 50 +5 percent relative humidity. Tests on the cured sealing compound shall commence not more than 2 days after completion of the specified cure

4.8 Jet reference test fluid. The jet reference fluid (JRF) required for conducting fluid immersion tests shall conform to AMS 2629. Type I fluid shall be used for conducting all tests requiring fluid except for the chalking test. Type II fluid shall be used for the chalking test.