MIL-DTL-11414F
4.5.26 Reactivity. Determine the reactivity of the paint in contact with the explosives listed in table
III using the vacuum stability test as specified by Test 1, Procedure A of STANAG 4147. The
reactivity shall be determined before and after storage for 60 days at 71° C and ambient relative
humidity and at 71° C and 100 percent relative humidity. The 100 percent relative humidity test
shall not be made on the black powder which is deteriorated by moisture. Prepare the samples as
specified in 4.5.26.1.
4.5.26.1 Preparation of samples. A sufficient amount of the paint to provide approximately 140
grams of dried film shall be poured on glass or stainless steel plates. The films shall be air dried
under ambient conditions for 48 hours, or unti1 no longer tacky, and then peeled off with a sharp
edged tool in strips. These strips are then suspended on glass rods in an oven or cabinet with
circulating air at a temperature not to exceed 30 oC for 48 hours. If an air circulating oven is not
available, it wi11 be satisfactory to place the suspended strips before a fan in a warm room for 48
hours. The paint strips are then removed, cut into smaller pieces, and then ground in a mortar
fine enough to pass through a 16-mesh sieve. The explosives shall be reduced by grinding or
rasping to a fineness of 20 mesh or less. The black powder shall not be ground, but is to be used in
the granulation furnished for the test. Ten samples shall then be prepared consisting of 10 grams of
each of the explosives listed in table III (with the exception of black powder) with 10 grams of
the paint. With the black powder, 7.0 grams of each shall be mixed with 7.0 grams of paint. The
mixing shall be thorough using a wood spatula with the mixture on a piece of glazed paper. After
mixing, the mixtures shall be spread out on large watch glasses, and dried in a desiccator at room
temperature for 24 hours. They are then placed in dry glass bottles with rubber or cork stoppers
and reserved for tests. At the same time, 10-gram samples of each of the explosives and a 20-
gram sample of the paint are prepared and bottled in the same way. Samples are taken directly
from these bottles to make the initial vacuum stability and onset of decomposition tests as
required in sections 4.5.26.3 and 4.5.28. For the storage tests, the remainder of the mixed
samples and controls, after the initial tests, are divided into equal portions and placed in separate
bottles. One series of the samples is arranged, unstoppered, in individual Mason jars, sealed
under ambient conditions, and placed in a surveillance oven at 71° C. The other series of
mixtures and controls, except the black powder, is placed, also unstoppered, in individual Mason
jars, each containing a test tube with 10 cc of water. The bottles containing the samples are
protected in such a way that condensation from the top of the Mason jar will not fall into the
sample bottle. The jars are fitted with rubber gaskets, closed, and placed in a surveillance oven at
71° C. After 60 days, the samples of both series are removed, dried in a circulating oven or
cabinet at approximately 35° to 40° C for 48 hours, and tested according to sections 4.5.26.3 and
4.5.28.
4.5.26.2 Calibration. Calibration of the glass tube shall be as specified by Test 1, Procedure A of
STANAG 4147.
4.5.26.3 Testing procedure. The procedure shall be as specified by Test 1, Procedure A of
STANAG 4147. Two and one-half gram portions of the dried paint, as controls, shall be added
to each of two tubes~ and 2-1/2 grams of each of the explosives, also as controls, shall be added
to individual tubes. Five-gram samples of each of the mixtures of any one of the series prepared
under 4.5.26.1, after drying for 24 hours in a desiccator at room temperature, are placed in
individual tubes. After assembly, the test is run as specified by Test 1, Procedure A of STANAG
4147 for 40 hours at 100oC. All readings shall be made with the sample removed from the bath
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