Polyester was selected for the warp or tensile member of the carcass due to high-modulus, low elongation features that reduce belt stretch and provide a more stable base. This stability allows for minimum take up lengths and eliminates the necessity of "breaking in" a belt prior to installing a vulcanized splice. It also eliminates the reinstallation of splices to eliminate start-up elongation and the resultant down time. Polyester also does not absorb as much moisture as other carcass materials, providing higher wet adhesions and a higher percentage of dry-tensile strength where the belt must operate in extremely wet or submerged conditions.

The lower modulus of Nylon allows more elongation; making it the ideal material for the weft or crosswise yarns in a belt carcass. The higher stretch allows the belt to trough under a lighter load than high-modulus polyester, resulting in better tracking characteristics. The elongation also provides shock absorption that yields higher fastener retention and higher longitudinal tear resistance. 

Utilizing 110, 125, 150, 200, 250, 300 and 400 pound per ply PIW, 10:1 Service Factor fabrics, U.S. Rubber is capable of producing Heavy-Duty fabric-plied belt specifications from 2 ply 220 pound PIW working tension up to 4 ply 1600 pound PIW working tension.

Top Cover:

Any thickness from 1/32"  to 1 1/2"

Carcass: 

1 to 10 plies 

Skims:

Heavy and high adhesion skim 

Bottom Cover:

Any thickness from 1/32" to 1"

Bare back also available (0.8-25.4mm)