Refractory and heat-insulating fractions are produced from ground refractory (dense) or heat-insulating (lightweight) primary or secondary materials – fireclay, mullite, calcined bauxite, white, brown and pink electrocorundum, corundum zircon, carborundum, magnesite, chrome magnesite. They have a content of Al 2 O 3 from 28 to 90%, ZrO 2 from 10 to 68%, MgO from 55 to 92%, SiC from 75 to 95%, depending on the specific requirements for use when putting them into products or backfills. The granulometric composition of the fractions complies with the specific requirements of the client.
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