... temperature. M1700 (heat furnace temperature 1650.C )M1800 (heat furnace temperature 1700.C) Standard sizes:M1700 type (d/c): dia3/6, dia4/9, dia6 ... /12, dia9/18, dia12/24M1800 type (d/c): dia3/6, dia4/9, dia6/12, dia9/18, dia12/24 ... in the industries of metallurgy, glass, ceramic refractory, crystal electronic device, industrial furnace manufacture, etc.. It is an essential ideal element ...