Tariff classification amendment: substitution of polypropylene waste sub-heading changes excise tariff treatment accordingly. The Central Government, under sub-rule (1) of rule 8 of the Central Excise Rules, 1944, amends Notification No. 243/79-Central Excises by substituting the existing sub-heading No. 5401.10 with sub-heading No. 5401.90 for polypropylene waste, effecting a targeted change in the tariff classification applicable to that material.