Input proportion limits govern precured tread rubber composition, specifying component shares and restricting antioxidant imports relative to rubber chemicals.

Input-output norms set allowable component weight shares for precured tread rubber manufacture, listing natural/synthetic rubbers and PBR, carbon black, and rubber chemicals (including anti oxidants and other additives). Importers must ensure imported inputs correspond to those used in the export product. The schedule stipulates that anti oxidant imports shall not exceed fifty percent of the total rubber chemicals allowed and serves as the determinative basis for eligible input proportions.

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