... / CM); Constant temperature zone length: 100mm, 200mm, 300mm,furnace heating time ≤ 180 min Insulation materials: polycrystalline mullite fiber; ... shoulde be indicated in the order; 6. Conventional furnace tube size: inner diameter φ80mm, length 1000mm; ... & spare parts: basic configuration: the host (including the furnace, temperature control system, gas control system, vacuum system, mechanical ...