It`s made from periclasite,magnesite aluminium spinel,chrome ore as raw material.

以方镁石、镁铝尖石、铬矿为主中性耐火制。

Sometimes the composition mineral besides the antigorite and the chrysotile, contains the few dolomite, the magnesite, the tremolite and the olivine and so on.

组成矿物除石和纤石外，有时含少量白云石、菱镁矿、透闪石和橄榄石等。