MIL-PRF-23942A(AS)
b. Pour the sample into a 600-milliliter (mL) beaker, place in the water bath at 77°F or
100°F, and stir with a thermometer until the sample comes to the test temperature. Do not stir air
bubbles into the sample.
c. Lower the viscometer on the ring stand until the surface of the sample is in the narrow
section of the spindle. Level the viscometer and operate at 20 revolutions per minute (rpm) for
determinations in the 100 to 2,000 poise range. During operation maintain the spindle depth in
the sample so that the polymer level climbs midway up the narrowest section of the spindle.
d. Obtain a series of readings until the value is constant.
4.5.2 Calculations. Using the No. 7 spindle at 20 rpm, and reading the 0 to 100 scale,
calculate the viscosities as follows:
Viscosity at 77°F, poises = (20)(scale reading)
Viscosity at 100°F, poises = (20)(scale reading)
If a different spindle or speed is used, consult the chart accompanying the instrument for the
multiplying factor. Convert the resulting centipoises to poises by dividing by 100.
Calculate the ratio of the viscosities at 77°F and 100°F as follows:
Viscosity ratio, 77°F /100°F = Viscosity at 77°F, poises
Viscosity at 100°F, poises
4.5.3 Specific gravity. The specific gravity shall be determined in accordance with
ASTM-D1298.
4.5.4 Index of refraction. The index of refraction shall be determined in accordance with
ASTM-D1218.
4.5.5 Carboxyl content. The procedures for the determination of carboxyl content shall be as
follows:
4.5.5.1 Apparatus.
a. Buret.
b. 250-mL Erlenmeyer flask or equivalent.
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