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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31

MIL-S-83318A(USAF)

7. Measure the length of the sealant in the dasher in millimeters. Measurements shall be between the interior bottom of the plug and the middle of the curve sealant bead at the other end of the dasher rod (length "X", as shown in figure 3).

8. Insert ramrod into the dasher rod and push until the valve is in full open position (as shown in figure 3).

9. Remove ramrod and clean off any remaining excess sealant at the handle end of the dasher rod.

10. Slowly push the valve body into the dasher, finally forcing a seal.

11. Lightly insert the ramrod again into the dasher until it just touches the top of the plug. Make a mark "B" on the ramrod at the handle end of the dasher.

12. Put firm hand pressure on the ramrod while the valve end of the dasher is held against a table edge. Make a second mark "C".

13. Measure the distance between the two marks on the ramrod. CALCULATION;

The percentage of air present in the sealant material can be calculated by determining the following ratio:

% air present = Distance of the 2 marks (BC) on the ramrod X 100% Original length of sealant in dasher rod

Three test runs should be made and results averaged. Use fresh equipment for each run. NOTE: Sample to be used for this compression test shall not be obtained from the sealant

at the top of each drum or container.

4.9.12 Weight loss and flexibility. Four 0.125 by 1 by 5-inch (3 by 25 by 125 mm) specimens shall be cut from a sheet of the sealing compound that has been cured for 14 days as per 4.7.6. The specimens shall be weighed and immersed in 900 ml of jet

reference fluid at 140°F (60°C) in a closed container for a period of seven days. At the end

of the exposure period, the specimens shall be removed from the fluid and air dried for 72 hours at 120°F (49°C). The specimens shall then be cooled to standard test condition in a desiccator and weighed. After weighing, the specimens shall be bent 180 degrees over a

0.125-inch (3 mm) mandrel and examined for evidence of cracking.