... manufacturer 2,Lower price 3,Top quality& long working life 4,High temperature 1800C Order sample:d=6mm, ... 1700C. When you place order, please choose suitable type according to your furnace working temperature. M1700 (heat ... 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, ...