MIL-PRF-27404D
APPENDIX B
B.2.1.2 Calculation. Calculate the non-volatile residue of the propellant as follows:
�2 - �1
��/� ��� = �
� 1 × 106
�
where,
W 1 = Weight of clean vessel in grams (g).
W 2 = Weight of residue and vessel in g.
V
= Volume of sample used in mL.
Report the averaged result of duplicate NVR determinations.
B.2.1.3 Equipment. The following equipment shall apply as test conditions of B.2.1.
a. Components described in Figure B-1.
b. Tubing polyethylene, ½ inch OD; borosilicate glass, ½ inch OD.
c. Clamps hose, to fit ½ inch OD tube.
d. Five decimal place analytical balance (semi-micro balance).
B.2.2 Hot plate. This method involves the gradual evaporation of a MMH sample on an
explosion proof hot plate in a fume hood. The difference in weight before and after evaporation is
calculated as NVR.
WARNING
Avoid the flammable MMH vapors from coming in contact with any
source of ignition by utilizing a certified explosion proof hot plate and a
high efficiency fume hood.
B.2.2.1 Procedure. Place three clean borosilicate glass or platinum evaporation dishes in an
oven at 110°C for 30 minutes. Label one as a blank and the others as samples 1 and 2. Remove
evaporation dishes from the oven and place in a desiccator to cool for one hour. Weigh each clean, dry
evaporating dish to the nearest 0.0001 g until the weight remains constant to ± 0.1 mg. Record the
sample evaporating dish weight as A and the blank evaporating dish weight as C. Transfer 40 mL of the
MMH sample into the evaporating dishes marked 1 and 2. Add 40 mL of water to each sample of MMH in
evaporating dishes 1 and 2. Add the same volume of purified water into the blank evaporating dish as
was added to the sample dish. Place each evaporating dish on a hot plate which is set to a temperature
of 150 - 200°C. Evaporate to dryness, but do not bake. Remove the evaporating dishes from the
explosion-proof hot plate and place them in an oven set at 110°C for 30 minutes. Remove dishes from
the oven and place in a desiccator for one hour to cool. Weigh each evaporating dish as before to a
constant weight while monitoring the room temperature with a narrow range viscosity thermometer
(dishes must be weighed at the same temperature). Record the sample evaporating dish weight as B
and the blank evaporating weight as D.
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