<h1>Standard Input-Output Norms require imported inputs to match prescribed proportions for exported chemical products, ensuring actual use in manufacture.</h1> Standard input-output norms prescribe allowable imported inputs and required proportions for specified export products. The SION for Ferrous Fumarate lists the export product with the corresponding import item and proportional quantity required for manufacture. Applicants must ensure imported inputs correspond to those actually used or required in the exported product, and the SION entry was incorporated by public notice.