MIL-DTL-10058J
rate and standard deviation. After average burn time and standard deviation is determined,
critical fuze length shall be set at an average minus standard deviation of four (4) sigma.
4.6.1.1 Inspection for critical fuze length. Cut fuzes shall be gaged and inspected 100%
plus verification level VII for compliance to the determined critical fuze length. Any fuze less
than critical fuze length shall be burned to determine the burn rate and if the burn rate is less than
five (5) seconds then critical defect and the lot shall be rejected. If the length of the fuze cord is
less than the determined critical length but not a short burn then it is a major defect.
4.7 Test methods and procedures.
4.7.1 Moisture content.
4.7.1.1 Whistle composition. The method of determining the percentage of moisture in
the whistle composition shall be in accordance with MIL-P-48239, except that the drying time
shall be for one hour in lieu of three hours.
4.7.1.2 Flash composition. Determination of moisture content of the flash composition
shall be performed by transferring a five (5) gram sample to a tared weighing dish. Weigh the
dish and the contents and then place in an oven maintained at a 212°F for three (3) hours. Cool
in a desiccator and weigh. Calculate the loss in weight of the dish and contents as percentage of
moisture in the sample.
4.7.1.2.1 Moisture content of flash composition. Moisture content shall be controlled as
specified in 4.5.1. For verification, a sample shall be taken from the contents of a "dummy: body
used in conjunction with the loading of the simulators. Moisture content shall be determined as
specified above.
4.7.1.3 Alternate method (for flash composition). The moisture content shall be
determined in accordance with Method T101.4 of MIL-STD-286. Timer shall be set to the
minimum time required to obtain constant readings. Temperature settings shall be 212°F +/-
41°F.
4.7.2 Granulation and composition.
4.7.2.1 Granulation. The particle size shall be determined in accordance with Method A3
of ISO 10070.
In order to avoid the dangerous operation of screening the flash composition, this test may be
performed by screening the individual ingredients prior to blending. Alternatively, particle size
can be verified by using the individual specification which is specific to the pyrotechnic powder.
4.7.2.2 Composition of flash powder.
4.7.2.2.1 Composition of KP/Al flash powder. The composition shall be determined in
accordance with MIL-P-48239.
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