At SIGMA, revamping means rethinking how we work, how we monitor, and how we serve our customers. Through connected machines, intelligent controls, and smart maintenance strategies, we’re making our production not just more efficient—but more agile, resilient, and ready for the future of refractory manufacturing.
SIGMA is rising at the forefront of digital transformation in glass production—leveraging IoT and Industry 4.0 to enhance process visibility, operational reliability, and future-proof agility.
At Sigma, we invest in clean energy, innovate boldly, and cut emissions—not corners. Can the same be said for every supplier in your portfolio?
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.
