Input-output norms for tyre retreading mandate specified input proportions and require imports to match declared export use.

Standard FTP Input-Output Norms specify the Butyl Rubber Curing Bag composition for tyre retreading (1 kg output: Butyl Rubber 0.48 kg; Carbon Black 0.32 kg) and note the item's suspension. Applicants must ensure imported goods correspond to the inputs used or required in the declared export product, with administrative verification of proportions.

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