... are sintering furnace and hot zones for sapphire growth furnace.Cooperating with Luoyang Huayi Furnace Institute we ... Achemetal Co., Ltd furnace department include: - sapphire crystal growth furnace- hydrogen protected sintering furnace , vaccum sintering furnace- ... Lead Shield, molybdenum current Lead Shield for sapphire crystal growth furnace- tungsten stander, tungsten supporter, tungsten crucible ...