OTL1200 Tubular furnace resistance wire (Sweden Kanthal A1) for the heating element, the double shell structure and 30 program temperature control system, phase trigger, silicon control, furnace using alumina polycrystalline fiber material, with temperature field equilibrium, low surface temperature, lifting temperature rate, energy saving, is universities, research institutes, industrial and mining enterprises do high temperature atmosphere sintering, atmosphere reduction, CVD experiment, vacuum annealing with ideal products.