Input-output norms require imported PVC tin-stabilizer inputs to match prescribed component proportions and intended export use. Input-output norms specify Shitastap 121 composition as about 34% mono octyl tin 2-ethylhexyl thioglycolate and 66% di octyl tin 2-ethylhexyl thioglycolate, and list per-kilogram input requirements: tetra octyl tin 0.293 kg, 2-ethylhexyl thioglycolate 0.673 kg, and tin tetra chloride 0.160 kg. Importers must ensure imported goods match these prescribed input proportions and are the actual inputs used or required in the manufacture of the export product; the SION for these norms is suspended by public notice.