Mandatory BIS certification requires specified products to meet Indian Standards before import or marketing, ensuring regulatory conformity. A catalogue of products subject to compulsory conformity to Indian Standards, grouped by statutory or quality control order. It lists food and infant nutrition items, cement and steel products, electrical equipment and accessories, batteries, clinical thermometers, steel tubes, oil stoves, solvent extracted oil products, gas cylinders and fittings, diagnostic X ray equipment, plastic feeding bottles, specified diesel engines, ductile iron pipes and pneumatic tyres, with the applicable standards, implementing authorities and dates; imports must conform to newly notified standards from their implementation date.