Francesco da Ronch

This year, we’re proud to announce a major step forward: we’ve been awarded the Ecovadis Silver Medal, placing us among the top 15% of companies evaluated globally for sustainability performance.

At Sigma Group, innovation often means elevating what already works. Our cutting-edge fast loop line for bottom blocks, based at our Plovdiv, Bulgaria facility, is a perfect example.

We’re proud to announce that our next-generation electric furnace is now fully installed and operational at our Plovdiv facility. With firing capability up to 1750°C, it stands as a landmark achievement in the refractory industry — combining high-performance sintering with a near-zero carbon footprint.

Discover SIGMA’s laboratory, where cutting-edge science drives unmatched quality and innovation.

Fostering genuine connections beyond business, we’re shaping partnerships that strengthen the industry with trust and collaboration.

As we step into 2025, we’re turning technological advancements and sustainability efforts into impactful results. From cutting-edge equipment upgrades to reducing CO₂ emissions, SIGMA is shaping a smarter, greener future.

Celebrating 35 years, SIGMA has grown from a single warehouse in Italy to a global leader in refractory solutions. Guided by three generations of the Mari family, the company now exports to over 60 countries, producing 20,000+ tons annually.

Discover how Sigma Group is strengthening relationships through insightful industry engagement, both online and in-person. In this edition, we recap key takeaways from the Glass Problems Conference and the ASEAN Glass Conference, highlighting groundbreaking advancements in melting technologies and our commitment to sustainability. Plus, get a sneak peek at what’s coming up at Glasstec 2024 in Düsseldorf.

As 2024 concludes, Sigma Group is at the forefront of digital transformation in glass manufacturing. By blending decades of expertise with cutting-edge technology, we’re enhancing production efficiency, sustainability, and product quality. Our new smart machinery and renewable energy initiatives are driving improvements, while our commitment to both innovation and human expertise ensures we’re ready for the future. At Sigma Group, we’re shaping tomorrow’s glass manufacturing today, and we’re excited to partner with you on this journey.

Discover how Sigma Group is strengthening relationships through insightful industry engagement, both online and in-person. In this edition, we recap key takeaways from the Glass Problems Conference and the ASEAN Glass Conference, highlighting groundbreaking advancements in melting technologies and our commitment to sustainability. Plus, get a sneak peek at what’s coming up at Glasstec 2024 in Düsseldorf.