中文在线观看视频,九九热精品免费视频,成年人免费看黄色,成年人免费看黄色,亚洲免费在线播放视频,国产aⅴ精品久久久久久,国产精品推荐精品

The Beiyuan graphite crucible is made of special high-purity, high-strength, and high-density graphite material; Excellent technicians; High precision processing equipment can provide customers with high-performance molds for graphite melting crucibles, casting crucibles, graphite oil tanks, pulling tubes, pulling pieces, and pulling rods. The selected specialized material can increase the durability of our graphite crucible products by more than twice compared to ordinary material products, with a longer service life and the ability to withstand high temperatures of 1800 ° C.