万润股份(002643.SZ)：布局的高性能聚合物产品聚醚酰亚胺（PEI）材料已实现销售，其年产能1500吨的量产线现已投入试生产

Group 1 - The company, Wanrun Co., Ltd. (002643.SZ), is primarily engaged in the research, production, and sales of products in four sectors: electronic information materials, environmental materials, new energy materials, and life sciences and pharmaceuticals [1] - The high-performance polymer product, polyetherimide (PEI), has commenced sales, with a production line that has an annual capacity of 1,500 tons now in trial production [1] - The PEI material is expected to gradually reach full production capacity as the production line matures and downstream demand increases, with applications primarily in fiber optic connectors, aerospace composite materials, and profiles [1]