Ad valorem duty on silicones imposed, adding a new tariff entry and amending a customs notification under section 25. The Central Government, exercising powers under Section 25(1) of the Customs Act, 1962, amends Notification No.36 Customs (1 March 1983) by inserting after Sl. No. 2 a new Sl. No. 3 in the annexed table: 'Silicones 150 per cent ad valorem,' thereby adding a tariff entry for silicones to the schedule of miscellaneous exemption notifications.