A family company created from the technical experience of his founder
Dario Mari.

Goal: to specialize in high-quality production of refractories for the glass industry.Thanks to continuous investment and customers’ trust, the company is now a leader in the glass industry.



Sales flow into REFRATRADE Srl for the consolidation and expansion of markets.


Doubling of the production capacity of special refractories by opening a new factory SIGMAREF SRL in Plovdiv, Bulgaria.

S.I.G.MA. GROUP, becomes the biggest European manufacturer of special shapes for glass furnaces.


S.I.G.MA Group operates today on the five continents and sells abroad more than 85% of its production.

Among its Customers, it counts the most important Glass Manufactures and Engineering Companies.