A rubber conveyor belt is a composite structure. The carcass provides tensile strength and dimensional stability, while the rubber covers protect the carcass from the material being carried on the top side and from the conveyor structure on the bottom. The carcass is built from layers of woven fabric — typically polyester, nylon, or a polyester-nylon combination — bonded together with rubber compound between each ply. Steel cord carcasses replace fabric plies in long-distance, high-tension applications where stretch control is critical.

Cover grade determines how the belt holds up against the specific abuse its application delivers. General-purpose grades handle moderate abrasion from dry, non-aggressive materials. Heavy-duty abrasion-resistant grades are used in quarrying, mining, and crushed stone handling where angular, sharp material contacts the belt surface repeatedly at high impact. Heat-resistant grades maintain structural integrity when carrying hot materials like clinker, coke, or foundry castings. Oil-resistant compounds are specified wherever petroleum products, oilseeds, or chemical residues contact the belt surface.

Belt width and speed, combined with the trough angle of the carrying idlers, determine volumetric throughput. Wider belts running at moderate speed often move more material per hour with less mechanical stress than a narrower belt pushed to high speed. Trough angles of 20, 35, or 45 degrees shape how much material the belt cross-section can carry without spillage on the sides.

For buyers sourcing rubber conveyor belts in volume, the key specification parameters are: belt width, carcass type and ply rating, cover grade and thickness on top and bottom faces, and any special compound requirements. Getting these defined before requesting quotations avoids mismatched proposals and ensures the belt delivered matches the operating environment it will run in.