国产精品免费视频一区-2021年国产精品免费-国产欧美另类在线视频观看-免费看成人国产一区二区三区-国产精品jizz视频-国产在线步兵一区二区三区-久久精品夜色国产- 亚洲а∨精品天堂在线 -亚洲综合激情小说-日韩亚洲综合精品国产

Optical Fiber Graphite Molds
Compared with other materials, special graphite has a high melting point (3650 ° C), a low vapor pressure at high temperatures (about 10~(-5) mm mercury column height at 2000 ° C), good electrical conductivity, and easy machining. If an ultra-high-purity graphite resistance furnace is used as the heat source for pulling the quartz fiber, the pollution level can be very low, the temperature can be easily controlled, the temperature distribution field can be adjusted according to the needs of the process. Besides, our special graphite molds are simple to use, of high quality-cost ratio and high efficiency.