MIL-DTL-45301E
3.4.3 Class 3. Unless otherwise specified (see 6.2), the tread elastomer shall be furnished
in sheet form, 16.00 + 2.00 in. (406 + 50 mm) wide, 0.38 + 0.13 in. (9.6 + 3 mm) thick and
60.00 + 12.00 in. (1524 + 305 mm) in length (see 4.8).
3.4.4 Class 4. Tread elastomer shall be furnished in sheet form as two sheets (sheet 1 and
sheet 2) whose relative cross sectional areas shall be regulated by the manufacturer so that equal
lengths may be mixed and successfully processed. Sheets shall be 18 in. (457 mm) wide, 0.50 in.
(13 mm) thick and 72 in. (1829 mm) in length (see 4.8).
3.4.5 Class 5. Tread elastomer shall be furnished in strip form, 0.44 +0.03, -0.00 in.
(11.1 +0.8, -0.0 mm) thick by 2.75 +0.13, -0.00 in. (70 +3, -0.0 mm) wide suitable for use in a
cold feed extruder and injection molding (see 4.8).
3.4.6 Class 6. The masterbatch tread elastomer shall be furnished in preweighed or
presized blocks or sheets of elastomer with the curing agents and chemical additives packaged in
premeasured quantities sufficient for mixing on a 42 in. (1067 mm) elastomer mill at one time
(see 4.8).
3.5 Operating requirements.
3.5.1 Performance.
3.5.2 Physical properties. The physical properties of the tread elastomer and the tie gum
shall be as specified in table III for all groups. Curing characteristics shall be as specified in
table IV. Special physical properties are specified for group B elastomer when furnished in the
P-12 material (see 4.9.1.1).
3.5.3 Adhesion. The tread elastomer shall be such that, when vulcanized onto the wheel
with the user's approved bonding agent and processes, the adhesion of the tire shall be complete.
There shall be no areas of deficient adhesion. The load required to separate the tread from a base
band or wheel, per in. of width on any line of separation around the circumference, shall be not
less than the following when the different materials are used (see 4.9.1.2):
Group A
- 100 pounds (lb) [45 kilograms (kg)]
Group B
- 130 lb (59 kg), 150 lb (68 kg) average
Group B, P-12 material
- 130 lb (59 kg)
3.5.4 Resistance to blowout. When assembled, the roadwheel (tire) shall withstand
6 hours continuous running at 30 miles per hour (mph) [48 kilometers per hour (km/h)] on a
rotating steel wheel drum without evidence of cracking, chunking, blowout, separation, blistering,
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