MIL-P-85489(AS)
4.5.3 Procedure. Weigh a 0.012 gram sample onto a 4- by 4-inch glass
plate. Add one drop of Twitchell Base 8240 surfactant, or equal. Paste
the sample for 2 minutes with a steel spatula. The resultant paste
should be a uniform dispersion. Transfer the paste to the MSA feed
chamber by means of a sharpened steel spatula. Add approximately
0.8 to 1.0 milliliter (ml) of feed liquid. Hold the chamber between
the thumb and index finger and shake to bring the sample into suspen-
sion. Introduce the sample into the 1.0-millimeter (mm) MSA tube (pre-
filled to the mark with chlorobenzene) and start the analysis schedule.
Determine the weight mean diameter, and report value to the nearest
0.1 micron.
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4.6 External moisture. The Karl Fischer (KF) method shall be used
with any suitable apparatus. The general procedure for total moisture
content shall be by titration of a solution of the sample in a 3:1 mix-
ture of pyridine and methanol. The surface moisture is determined by
titration of a slurry of the solid sample in a solution or liquid med-
ium saturated with ammonium perchlorate. The end point may be deter-
mined either visually or electrometrically by means of either a direct
or back titration of a measured excess of KF reagent. The direct titra-
tion shall be in accordance with ASTM-E-203 and the back titration shall
be in accordance with ASTM-D-1348. The standardization of the KF
reagent shall be performed daily in accordance with ASTM-E-203. All
the standard precautions shall be taken to protect the specimens against
change in moisture content and to protect all reagents, solvents and the
titration mixture against the entry of water. During all the titrations,
the stirring action shall be at the highest speed which will not cause
splashing or bubble formation.
PACKAGING.
5.
5.1 Packing and storage. Strands shall be packed in conductive
plastic with no more than one pound of strands to a container. Strands
shall be packed parallel and straight. Precaution shall be taken to
prevent bending or deforming of strands. The plastic shall be sealed
with moisture-proof tape conforming to L-T-100 and placed in moisture-
proof containers with a one-third unit (or larger) of desiccant con-
forming to MIL-D-3464, Type I. The lid of the container shall either
be moisture proof or sealed with moisture-proof tape. The sealed con-
tainers shall be stored in the temperature range of 5 to 32°C.
5.2 Marking. Marking shall be in accordance with MIL-STD-129 and
shall include the following information:
a.
Propellant designation
b.
Mix number
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