Zhejiang Xinan Chemical Industrial Group Co., Ltd. (known as Wynca Group) was founded in 1965, and listed in Shanghai Stock in Sept. 2001.

Wynca Group is primarily engaged in three core businesses: crop protection, silicon-based new materials and phosphorus-based new materials.The company has established a comprehensive silicone industry chain, encompassing the smelting of silicon metal, synthesis of monomers, and the production of silicone downstream products. This has led to the creation of four major product series: silicone rubber, silicone oil, silicone resin and silane coupling agents. All of those have contributed to the company’s superiority of whole industrial chain in the industry.

Wynca Group is dedicated to a global strategy, pursuing development that is high-end, intelligent, and environmentally sustainable. Its products are distributed across numerous countries and regions worldwide. The company has established subsidiaries in North America, South America, Africa, Europe, and Malaysia, and has established strategic partnerships with Momentive and Evonik. These alliances have played a pivotal role in the sustained enhancement of Wynca's global brand popularity and market shares.

Topwin is established by Wynca Group together with several specialty silicone companies for the purpose of integrating the complete Silicone industry chain and marketing into the end-product fields. The company's competitive advantage is rooted in its founders, who possess extensive expertise in both the upstream and downstream sectors of the supply chain.

Specializing in the research, production, sales, and marketing of silicone-based performance materials, Topwin also serves as a professional provider of technical services. Our products are mainly used in Polyurethane Foam, Leather and Textiles, Inks and Coating, Agriculture, Paper and Film, Cosmetic Industry, etc.

The goal of Topwin is to become one of the leading silicone based performance materials suppliers and solution providers in China.