MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202421091802 A) filed by Borosil Renewables Limited on November 25, 2024, for High-Performance Solar Glass Through Reduced Antimony And Optimized Composition.
Inventors include Biswanath Sen; Dr. Jeetendra Sehgal; Sultan Khan; Sandeep Reddy Gottam; and Tejal Sopan Mandlik.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: The present invention relates to a low-antimony soda–lime–silica glass batch composition designed for producing high-transmittance textured solar glass for photovoltaic applications. Conventional solar glass relies heavily on antimony as an oxidizing and fining agent, but its toxicity, environmental risks, and regulatory restrictions necessitate significant reduction. The invention achieves a 40–45% reduction in antimony while improving optical performance. This is accomplished through a coordinated optimisation of nitrate-based oxidation, dolomite–limestone melt chemistry, and sulphate–nitrate fining. Three novel ratios are defined and controlled: (i) Oxidiser Efficiency Ratio (OER = nitrate/antimony), (ii) Melt Chemistry Ratio (dolomite/limestone), and (iii) Fining Ratio (sulphate/nitrate). These ratios stabilise redox, suppress chromophore formation, improve bubble refining, and yield glass with visible light transmittance =91–92%. The resulting composition enables superior clarity, reduced environmental impact, lower heavy-metal leaching, and cost-effective manufacturability without dependence on premium low-iron raw materials
Disclaimer: Curated by HT Syndication.
