The Sorbit's furnaces are heated electrically or with natural gas according to the type of plant. The uniformity of temperature inside the chamber is guaranteed within 3 degrees centigrade even at high temperatures. TUS (Temperature Uniformity Survey) are performed for every furnace, at least, once a year. All control and registration instruments (such as thermocouples) are calibrated every three months.
Such procedures have enabled the company plants to be approved by German TUV, since 1988 and, in 1996, to certify its Quality Management System, according to the UNI EN ISO 9002 (then 9001). In 2003, the company has certified its Environmental Management System according to UNI EN ISO 14001.