MIL-C-47244A (MI)
TABLE I. Hardness requirements.
Curing conditions
Hardness value
Not less than 40
Shore D
Cond 1: Room temperature for 24 ± 2 hours
Not less than 55
Shore D
Cond 2: Room temperature for 7 days
Not less than 55
Shore D
Cond 3: Room temperature for 3 hours,
followed by 66 ± 1ºC for 3 hours, followed by
room temperature for not less than 3 hours
3.3.6 Low temperature stability. The cured resin system shall withstand
exposure to a temperature of -54º ± 3ºC without cracking, checking, or loss of
adhesion.
3.3.7 Humidity and heat resistance. The cured resin system shall withstand
simultaneous exposure to a relative humidity of not less than 90 percent and
temperature cycling as follows:
a.
A temperature of 49º ± 3ºC for 3 days
b.
Returned in not less than 3 hours to -12º ± 3ºC and maintained at this
temperature for not less than 30 minutes
c.
Uncontrolled stabilization at room temperature
d.
Increase to 88º ± 3ºC in not less than 50 minutes, and maintained at this
temperature for 4 hours.
No softening, sponging, blistering, checking, shrinking, or loss of adhesion shall occur.
Weight of the resin system shall not increase more than 5 percent. Thickness of the
resin system shall not increase or decrease more than 5 percent.
3.3.8 Tread resistance. The cured resin system, after continuous exposure for
72 hours (minimum) to a temperature of 88º ± 3ºC, shall show no evidence of surface
degradation or loss of adhesion as a result of foot traffic.
3.3.9 Low temperature impact resistance. The cured resin system, when
stabilized at the temperature specified in 3.3.6, shall not shatter when impacted by a
0.5 pound steel ball dropped from heights up to 20 feet.
3.3.10 Flammability. The cured resin system shall be self extinguishing.
3.3.11 Hydrocarbon resistance. The cured resin system shall not have any loss
of adhesion or be adversely affected after exposure to hydrocarbons. The
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