Input-output norms require specified raw-material composition for PVC electrical fittings; imported inputs must match declared usage. Standard Input-Output Norms for PVC electrical and allied fittings set required constituent inputs per kilogram of finished product - PVC resin, impact modifier, non-tin stabilizer, flow promoter and plasticizers - and a schedule mandates determination of permissible input proportions. Applicants/importers must ensure imported goods correspond to inputs actually used or required in the export product, establishing a verification obligation that aligns imports with declared manufacturing use.