MIL-DTL-3100H
3.4 Physical and mechanical properties.
3.4.1 Hardness. The hardness [durometer Shore A or International Rubber Hardness
Degrees (IHRD)] of elastomer compounds shall be 70 +7 when tested in accordance with 4.6.3.
3.4.2 Accelerated aging characteristics. After aging 166 hours at 158 degrees
Fahrenheit (°F), within any one specimen, the change in tensile strength shall be not more than
+25 percent (%) and the change in elongation shall be not more than +35% when tested in
accordance with 4.6.3.
3.4.3 Low temperature flexibility. At a temperature of -40°F, the specimen shall show
no evidence of cracks, fissures, or holes visible to the naked eye, or complete separation into two
or more pieces when tested in accordance with 4.6.3.1.
3.5 Performance.
3.5.1 Endurance requirements. The wheel assembly shall evidence no internal or external
failure after rolling under the following conditions; however, no one sample shall be required to
withstand operation under both condition sets a and b (see 4.6.4).
a. For 48 continuous hours at not less than 10 miles per hour (mph) under 100% load
specified in table I and tested as specified in 4.6.4.1.
b. For 6 continuous hours at not less than 30 mph under 120% load specified in
table II and test as specified in 4.6.4.2.
The tires shall exhibit no cracking, chunking, blowout, separation, blister, contamination,
porosity, delamination, or lack of adhesion. Any undercutting shall be not more than 0.25 inch
(in.) deep.
TABLE I. Wheel assembly loads - 10 mph. 1/
Assembly
Pounds per inch
100% load total
Size (nominal)
Part number
of width
pounds (min.)
11 x 3
5636637
385
1155
11 x 3-7/16
12296928
385
1155
12-1/2 x 2-1/2
12292059
452
1582
13-1/2 x 3-1/2
8763030
495
1732
13-1/2 x 3-3/4
8706067
495
1856
22 x 1-3/4
10925778
885
1548
23 x 1-1/4
9092158
935
1168
24 x 2-1/8
11678270
985
2093
24 x 2-1/8
8763350
985
2093
5
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