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Propellant ballistic test, Critical defect |
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|  MIL-S-13261G(AR)
4.4.3.3 Propellant ballistic test, Critical defect. 50 signals
per propellant sub-lot of loose propellant composition are to be
ballistically tested in fully loaded signals at hot temperature in
accordance with 4.5.2.1 and 4.5.12. Upon successfully meeting the
requirements as classified in Table III of 4.4.3.2 the propellant
composition used and the method of manufacture of the propellant
assembly shall be considered adequate for production. All
production will then utilize the spacer, propellant part no. 8797936
in the aft end anti the slotted spacer propellant, part no. 9328587
in the forward (delay assembly end) section of the tube, casing,
part no. 8797921.
4.4.4 Inspection equipment. The inspection equipment required
to perform the examinations and tests prescribed herein is described
in the "Paragraph Reference/Inspection-Method" column in the tables
starting with paragraph 4.4.2.1. The contractor shall submit for
approval inspection equipment Section 6 of MIL-A-48078 and 6.2
herein.
4.5 Test methods and Procedures.
4.5.1 Moisture content.
4.5.1.1 Black powder. The moisture content of the black powder
shall be determined in accordance with MIL-P-223.
4.5.1.2 Illuminant composition. The Karl Fischer Method as
stated in MIL-STD-1234, Method 101.2 up to paragraph 5.3 shall be
used. A fifty gram sample plus or minus 0.1 gram shall be added to
a 500 milliliter (ml) volumetric flask containing approximately 300
to 400 ml of methanol and 25 grams of dry sodium nitrate. The flask
shall be stoppered and the contents swirled cautiously for several
minutes until the material is thoroughly dispersed. The sample
shall be allowed to remain in contact with the methanol for
approximately two hours. Then the 500 ml volumetric flask shall be
filled up to the 500 ml mark with methanol and swirled again. A
blank without the sample shall be put through the same procedure.
After the sample has settled, a 50 ml aliquot of the clear
supernatant liquid shall be withdrawn and immediately, transferred
to the standard titration vessel containing approximately 100 ml of
methanol which has just been titrated to the preliminary end point
as described in MIL-STD-1234, Method 101.2, paragraph 5.1. The
final end point shall be reached in 3.5 minutes in the manner
described in MIL-STD-1234, Method 101.2 paragraph 5.4. A 50 ml
aliquot of the blank shall be titrated in the same manner. The
water content shall be calculated as follows:
Percent water equal (VR-S) - (V'R-S')
Multiply the result by 100F and divide by W
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