MIL-PRF-87895A(USAF)
4.5.2 Viscosity.
The viscosity of the compound shall be determined in accordance with ASTM D 2196, except
that the temperature of the sample shall be 375 ±1°F and a No. 3 spindle at 20 rpm shall be
used.
4.5.3 Softening point.
The softening point of the compound shall be determined in accordance with ASTM E28.
4.5.4 Penetration.
The penetration values of the compound shall be determined in accordance with ASTM D937.
4.5.5 Flash and fire points.
The open cup flash and fire points of the compound shall be determined in accordance with
ASTM D92.
4.5.6 Volatile content.
The volatile content of the compound shall be determined in accordance with ASTM D2369.
4.5.7 Ash content.
The ash content of the compound shall be determined in accordance with ASTM D1208, Sec
2.
4.5.8 Acidity or alkalinity.
Dissolve 5 gm sample of the compound in 10 mL of toluene, which is neutral to
phenolphthalein. Shake the solution with 100 mL of distilled water in a 250 ml separatory
funnel for at least five minutes. Filter and titrate with N/100 H2SO4 or N/100 NaOH as
necessary using phenolphthalein as indicator. A blank shall be run on an equal volume of the
water used. Calculate the acidity or alkalinity of the sample as follows:
4.9 (C - B) N
Acidity as sulfuric acid, percent by weight =
W
4.0 (A - B) N
Alkalinity as sodium hydroxide, percent by weight =
W
Where:
A = mL of H2SO4 solution required for the titration of sample.
B = mL of standard solution required for the blank.
C = mL of NaOH solution required for the titration of sample.
N = normality of the standard H2SO4 or NaOH
W = weight of sample in grams
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