Menu Contact Us Downloads Refractory Products & Grades Sigma has been operating in the refractory market since 1990. High specialization and continuous investments over the years in both manufacturing facilities, one in Italy and the other in Bulgaria, allow SIGMA GROUP to supply the complete range of materials for glass furnaces from fireclay to sillimanite, mullite, high alumina, zircon/mullite and zircon. Thanks to the cooperation of specially selected and reliable partners SIGMA GROUP can widen the range of refractories with magnesia-based materials, dense, fused & insulating silica, fused cast, insulating bricks & blocks, ceramic fibers & boards, mortars & castables. As an additional service for Customers, several standard shapes and grades are available in stock for prompt deliveries. Thanks to a state-of-the-art laboratory and a team of experts in Research & Development, the company has engineered over the years unique products as well as improved products already widely used like a specially grooved tube which grants a better gob homogeneity, a bonded high alumina for channel blocks which represents the best alternative to fused cast α-β alumina for all glass contact applications for operating temperatures up to 1300°C , a high grade mullite & new structural design for the regenerator chambers which grants a higher resistance to chemical attack and increased structural stability at high temperatures. Attested certification ISO 9001. Feeder expendables Channel blocks Working end superstructures Forehearth superstructures Regenerator chambers Insulating bottom blocks Safety layers Glass contact and superstructure fused cast Sidewall blocks Furnace crown Insulating material Castables, cements and ceramic fibres PLEASE CONTACT US FOR ANY FURTHER INFORMATION ON OUR PRODUCTS Products Enquiry Name * Company * Email * Telephone * Country * Subject * Message * Submit Via delle Grigne, 12/A 22070 Locate Varesino (CO) - Italy VAT N. 01872290133 Phone +39-0331-823.195 Fax +39-0331-823.198 e-mail: office@sigmaref.it S.I.G.MA. S.R.L. Locate Varesino, Italy SIGMAREF SRLU Plovdiv, Bulgaria REFRATRADE S.R.L. Locate Varesino, Italy Questo sito o gli strumenti terzi da questo utilizzati si avvalgono di cookie necessari al funzionamento. Chiudendo questo banner o proseguendo la navigazione in altra maniera, acconsenti all’uso dei cookie. AccettoPolitica dei cookie