MIL-DTL-81530B(OS)
means of a cloth wet with butyl acetate. The charged igniter assembly shall be dried at a temperature of
+100bF to +120bF for a minimum of 12 hours. After removal of the units from the drying equipment, if
more than 4 hours elapse before their assembly into ignition elements the units shall be dried at +100bF
to +120bF for a minimum of 4 hours immediately prior to their being assembled into ignition elements.
3.8.1 Ignition charge. The ignition charge shall be compounded by an improved method which
contains the weight composition of nonvolatile constituents prescribed on Drawing 1558439. The
finished ignition charge when ready for buttering into the igniter assembly shall be uniformly mixed
slurry in which all of the particles are wetted. The consistency shall be such that the liquid will not
separate from the mixture when the dish is tilted. Adjustments of the consistency may be obtained by the
addition of pure butyl acetate or by evaporation of the solvent. An advisory procedure for preparing and
loading the ignition charge is given in 6.4.
3.9 Ignition element inspection.
3.9.1 Visual inspection. The complete ignition element shall be free of visible defects noted in 4.6.5.
3.10 Bridgewire resistance. The bridge resistance of each completely assembled ignition element
manufactured, when measured electrically as specified in 4.6.4, shall be not less than 0.08 ohm nor more
than 0.14 ohm.
3.11. Tests.
3.11.1 Electrical sensitivity.
3.11.1.1 No-fire. The ignition element assembly shall not function when an electric current of 2.00
amperes is applied in accordance with 4.6.6.1. An ignition element which fires is considered defective
and is sufficient cause for rejection of the lot represented.
3.11.1.2 All-fire. The ignition assembly shall fire when an electric current of 3.00 ampheres is applied
in accordance with 4.6.6.2. An ignition element which does not fire is considered defective and is
sufficient cause for rejection of the lot represented.
3.11.2 Functioning. Ignition elements from each production lot selected in accordance with 4.6.7 shall
meet the requirements listed below when subjected to the test prescribed in 4.6.7.
3.11.2.1 Response time and output. When assembled in the firing test fixture prescribed in 4.6.7 the
ignition element shall fire in a period of time not to exceed 15 milliseconds. When fired as prescribed in
4.6.7, the ignition element shall cause the puncture of a brass diaphragm 0.008 inch thick, Drawing
2302112, and subsequent thereto, successfully ignite a charge of approximately 0.080 gram of double
base propellant, Drawing 838AS100. An ignition element which fails to fire in the prescribed time or to
meet the output requirements shall be considered defective and shall cause rejection of the lot
represented.
3.12 Workmanship. Ignition elements shall be constructed and finished in a manner to assure
compliance with all requirements of this specification. Particular attention should be directed to
dimensions, finishes and coatings.
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