MIL-PRF-23942A(AS)
a = 100 A
bcd
Where:
a = absorptivity to be determined
A = appropriate baseline absorbance
b = cell thickness in cm
c = polymer concentration, g/L
d = percent concentration of the unsaturation type being
measured as determined by the complete method
Several polymers should be used as secondary standards. The average absorbtivity for each type
of unsaturation is then substituted in the equation given under calculations (see 6.4.4).
4.5.7 Volatile materials determination. Volatile materials shall be determined by vacuum
evaporation at 200°F and 1 millimeter (mm) of mercury. Twenty grams of sample (W1) shall be
weighed to the nearest 0.1 mg in a previously tared 250-mL flask. The flask shall be attached to
an appropriate evaporation system capable of maintaining a vacuum of 1 mm of mercury. The
flask shall be submerged to the neck in an oil bath maintained at 200°F. The evaporation process
shall continue for 15 minutes after the vacuum reaches 1 mm of mercury. The flask shall be
cooled, then reweighed (W2) (gram of volatile material lost). Percent volatile material shall be
determined as follows:
Volatile, wt % = W2 (in grams) X 100
W1 (in grams)
4.5.8 Moisture content.
4.5.8.1 Apparatus.
a. Electrometric titration apparatus described in ASTM-D1159.
b. A three necked, flat bottomed, 500-mL capacity titration flask may be used. The three
necks are used for insertion of the sealed buret tip, electrode assembly, and sample and solvent
introduction. If other titrations vessels are used, provision for exclusion of atmospheric moisture
shall be provided.
c. Stirrer. A Teflon (TFE), or equivalent, covered magnetic stirring bar.
d. Stopwatch or timer.
11
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business