万润股份：公司是国内首家实现PEI材料商业化生产的企业

Group 1 - The company, Wanrun Co., Ltd. (002643), is the first in China to achieve commercial production of PEI materials, indicating a significant milestone in the industry [1] - The primary applications of PEI materials include fiber optic connectors, aerospace composite materials, and profiles, suggesting a broad market potential [1]