MIL-DTL-81530B(OS)
is removed by decantation or by siphoning. Approximately 25 milliliters of ethanol are added and the
mixture is stirred gently, allowed to settle, and the water siphoned off. An additional 25 milliliters of
ethanol are added and the stirring, settling, and siphoning procedure repeated. The remaining mixture is
air dried at ambient temperature for 2 hours and then oven dried for 12 hours at 90!F. The dry weight of
the styphnate is then determined. In a separate container, dry cellulose nitrate equivalent to 2.0 percent of
the dry weight of the lead styphnate is mixed with butyl acetate to make an approximate 0.5 percent
solution. (A weighted quantity of gravimetrically standardized stock solution of approximately 0.5
percent cellulose nitrate concentration may be used to obtain the 2.0 percent of cellulose nitrate
required.) This solution is added to the dry styphnate and mixed until the styphnate is thoroughly wetted.
6.4.2 Segregation and handling of ignition charge. The ignition charge is transferred to loading
dishes in 2-gram batches. The loading dish should be constantly checked to prevent the mixture from
becoming too dry, particularly around the edges and on top of the dish. If necessary, the operator may
add butyl acetate and work the mixture to the proper buttering consistency. A maximum of 2 grams of
mix should be present at each loading station and then only when an operator is present. Any spilled
charge should be cleaned immediately with a cloth that has been wet with butyl acetate. The soiled cloth
should be placed in a special explosives waste disposal container.
6.4.3 Operating precautions.
6.4.3.1 Lead styphnate. Dry lead styphnate is characterized by unusual sensitivity to electrical
discharge. Except when absolutely necessary to obtain accurate weights, lead styphnate should never be
handled in a dry state. Bulk lead styphnate should be stored under water or under butyl acetate. All
loading, mixing, and handling of lead styphnate or compositions containing lead styphnate should be
conducted in rooms kept at a relative humidity of 80 percent minimum.
6.4.3.1.1 Ignition charge and grounding. All mixing and loading of ignition charge should be done
behind an approved safety shield. Fixture, equipment, benches, and floors should be properly grounded to
prevent accidental ignition due to static discharge. This applies also to spatulas used in buttering
operations which should be grounded by means of a wire connected directly to a grounded bus bar.
6.4.3.1.2 Butyl acetate. Butyl acetate, when used as a wetting agent, affords a degree of resistance to
the initiation of the lead styphnate. Although not as effective as water, butyl acetate volatilizes rapidly to
reduce the drying period. However, it should be note that this chemical is flammable and produces vapor
which in itself is a fire hazard. Use of an exhaust system is recommended when performing buttering
operations involving butyl acetate.
6.5 Gages. The contractor should provide himself with whatever gages are necessary to ensure that the
material to which this specification applies will meet the dimensional requirements shown on the
applicable drawings.
6.6 Subject term (keyword) listing.
Ejection systems, aircrew
Emergency escape systems, aircrew
Escape systems, aircrew
Life-saving systems, aircrew
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