三孚股份：目前与国内主要光纤预制棒生产企业建立了良好合作，国内市场占有率较高

Core Viewpoint - Sanfu Co., Ltd. has established a strong market presence in the domestic market for high-purity silicon tetrachloride, primarily used in the production of optical fiber preform rods and artificial quartz [1] Group 1 - The company's high-purity silicon tetrachloride products are mainly utilized in the production of optical fiber preform rods and artificial quartz [1] - Sanfu Co., Ltd. has built good cooperation with major domestic optical fiber preform rod manufacturers [1] - The company holds a relatively high market share in the domestic market [1]