Standard Input-Output Norms define permitted import inputs for chemical export products and require strict use linkage in manufacture. Standard Input-Output Norms prescribe the export product and permitted import input for NAS-5((2-Diazo-1-Napthol-5-Sulfonic Acid, Sodium Salt) under the Chemical and Allied Products schedule. The norms specify that 1 kg of the export product is linked to 0.70 kg of Tobias Acid, with a minimum purity of 97%, as the admissible import item. Applicants must ensure that the goods sought for import and actually imported are those used or required in the export product.