Celebrating 36 years of excellence, SIGMA Group continues its journey as a global leader in high-performance refractory solutions. Guided by three generations of the Mari family—now including the addition of Valentina Mari to the Sales and Marketing team—the company remains committed to innovation, exporting over 80% of its production to more than 60 countries worldwide.
Our investments in renewable energy, intelligent controls, and electrification are transforming how we produce, what we consume, and how we impact the planet. And today, these aren’t just plans on paper—they’re real, operational, and already delivering results.
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.
