MIL-DTL-82633A (OS)
4.4.5.2 Procedure. Use the following procedure to determine gel time.
a. Weigh 100 grams (g) of each component into individual containers, and slowly stir each
component separately by hand with a wooden paddle for 3 minutes, avoiding the entrapment of air.
b. Combine each 100 g component into an appropriate sized mixing container in the recommended
ratio.
c. Start the stopwatch, and mix the components thoroughly for 3 minutes, avoiding air entrapment by
slow agitation with a stirring rod or mixing paddle. To avoid transfer of heat, do not hold the container
by hand during the mixing operation. Record the start of mixing as the "starting time."
c. Place the sample container on a nonconducting surface in still air at the test temperature.
d. Every 15 seconds, probe the center surface of the reacting mass with the applicator stick
perpendicular to the material surface.
e. When the reacting material no longer adheres to the end of a clean probe, record the gel time as the
elapsed time from the start of mixing.
4.4.6 Slump test. For 1 minute, thoroughly hand-mix 100 g of component A with 100 g of
component B. Pour mixture immediately into a 3-ounce ointment can or other suitable container (2
inches (in) in diameter by 1 in deep) filling to within in of top. Measure time from start of mixing.
After 15 minutes, place container on its side. Reacting mixture shall not have slumped beyond the edge
of the container when observed 30 minutes after start of mixing. Conduct entire procedure at an ambient
temperature of 75 ± 5 ºF.
4.4.7 Alkalinity. Break or dice into small pieces (approximately 1/16 by 1/16 in) the cured material
retained from the slump test of 4.4.6. Weigh accurately approximately 10 g of the sample into a 250-ml
beaker. Add 100 ml of distilled water and boil for 30 to 45 minutes. Wash down sides of beaker with
10 to 20 ml of distilled water. Allow to cool to room temperature. Test the solution with red litmus
paper. If paper does not become blue (pH 7), consider the sample have no alkalinity. Proceed with the
acidity test of 4.4.8.
4.4.8 Acidity. Add 5 drops of phenolphthalein to the solution from 4.4.7. Titrate with 0.01N sodium
hydroxide to the end point. Pink color should last for 30 seconds. Run a blank. Calculate percent acidity
4.9
(as H2SO4) as follows.
Where:
A = ml of sodium hydroxide for the sample
B = ml of sodium hydroxide for the blank
N = normality of the sodium hydroxide
W = weight of sample, g
4.4.9 Stability. For the stability test, use the test specimens of the compression set tests of 4.4.11a.
After heat treating at 160 ºF for 48 hr, examine the specimens for evidence of oil or other materials
leaching out.
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