Dear Mr. Rajesh Mendiratta,
Although all of the above respondants have given useful information, I would like to add that you should also consider the following fabric belt alternatives:
(1) Polyester/nylon reduced ply carcass;
(2) Single ply straight warp; and
(3) Two-ply straight warp.
Any of the above fabric carcass choices will provide less stretch than your nylon/nylon option. You can choose different strength ratings, depending on the ply strength and the number of plies.
Of course, if your application requires a high tensile belt, steel cord belts are a viable option.
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