Flat transparent sheet glass's BIS certification guarantees adherence to IS 2835: 1987 criteria for quality and safety. Manufacturers have to apply via the BIS portal, send samples for testing at a BIS-approved lab, and have a factory inspection. Approved, they get an ISI mark and license for their good. Renews call for regular audits and compliance checks. The three to six months of the process cost roughly ₹1-2 lakhs. Glass sold in India must be certified in order to guarantee safety, transparency, and durability. Following BIS recommendations exactly guarantees seamless certification and commercial operations.