1500/1700℃ 12L High Temperature Muffle Furnace - Zhengzhou . 1500/1700℃ 12L High Temperature Muffle Furnace. Introduction: The first-class workmanship using high-quality materials, combined with ease of operation, make the 1700.C muffle furnace all-rounders in research and the laboratory, such as sintering, melting, annealing, test, etc.