Sigma Group

Sigma Group is a global leader in refractory solutions for the glass manufacturing sector, specializing in high-quality materials like Mullite, High Purity Alumina, Zirconium/Mullite and more. With a deep passion for excellence, we are dedicated to enhancing the efficiency and sustainability of high-temperature industrial processes within the glass industry. Our state-of-the-art facilities in Italy and Bulgaria feature advanced machinery and one of the industry’s most sophisticated laboratories. This enables us to maintain rigorous control over research, development, and quality assurance. Our products deliver exceptional durability, thermal resistance, and reliability, even in the most demanding glass manufacturing environments. Thanks to our lean and agile structure, we offer unparalleled flexibility and swift decision-making. We provide customized solutions tailored to each client’s specific needs, ensuring optimal performance in glass production processes. Our range of vibrocast and pressed refractory products—both dense and insulating—is engineered to withstand critical operating conditions. Innovation is at the core of Sigma Group. From our patented feeder tubes that enhance gob thermal homogeneity to advanced solutions for regenerator chambers and high-efficiency feeders, we lead in refractory technology for glass manufacturing. Our team of chemists and geologists continually develops new materials to meet evolving industry demands. Sustainability is a fundamental value. Our facilities are equipped with photovoltaic systems generating a combined 900,000 kWh annually, reducing CO₂ emissions by 480 tons each year. We’re also investing in an electric furnace project set to be operational in 2025, further minimizing environmental impact and enhancing product quality. Trusted by industry leaders in container glass, tableware, pharmaceutical glass, and perfumery and cosmetics, we pride ourselves on building relationships based on integrity and mutual success.