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Nanjing Longtan Fine Chemical Co., Ltd. is located in the picturesque eastern suburbs of Nanjing—Longtan Subdistrict Office, Qixia District. It is bordered by the Shanghai-Nanjing Railway and National Highway 312 to the south, and adjacent to the Nanjing Port Longtan Port Area to the north.

The company was established in 1985, covering an area of over 8,000 square meters. It primarily produces the "Xinwo" brand high-efficiency skin penetrants—Azone and Thiazone series products. These include standard-grade Azone, medical-grade Azone, cosmetic-grade Azone, pesticide-grade Azone, printing and dyeing-grade Azone, water-soluble Azone, powdered Azone, Thiazone, agricultural silicone, 1-Bromobutane, 1-Bromododecane, liquid bis-2.5, silicone waterproofing agents, and more. Among these, the annual production of Azone exceeds 500 tons. The product quality, production, and sales volume lead the industry, earning the trust of a wide range of users. The products are sold throughout the country and exported to international markets.