MIL-C-47244A(MI)
FIGURE 2. Tread resistance test setup.
4.6.11.2 Resistance to test fluid. The remaining half of each of the test panels
shall be immersed in hydrocarbon test fluid conforming to TT-S-735, Type I, for not
less' than 25 minutes. Upon removal, the test panel shall be allowed to air-dry for not
less than 30 minutes. The test specified in 4.6.11.1 shall be repeated except that the
flame shall be applied to the portion of the resin system that had been immersed in the
test fluid.
4.6.12 Blast erosion. The blast erosion test shall be performed using a
combustion chamber capable of generating exhaust products having the composition
and characteristics specified in 3.3.12. The nozzle of the combustion chamber shall
have an exit-to-throat area ratio of 5.5 ± 0.1. A test panel having a known resin system
thickness shall be placed in a temperature chamber controlled at 94° ± 3°C and allowed
to remain at this temperature until stabilized. Within 5 minutes after removal from the
temperature chamber, the test panel shall be exposed to the exhaust emanating from
the combustion chamber for not less than 90 milliseconds. During exposure, the test
panel shall be securely positioned, so that the surface of the resin system is
downstream from and normal (± 5 degrees) to the flow from the combustion chamber
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