Excise duty exemption caps levy on margarine-type goods to a fixed per tonne rate, limiting duty above that cap. The notification limits excise duty on goods under sub heading No. 1508.90 by exempting from levy any portion of the duty specified in the tariff Schedule that exceeds a fixed per tonne cap, exercised under sub rule (1) of rule 8 of the Central Excise Rules and referencing the Central Excise Tariff Act Schedule.