WELINK is a Hongkong based company with state-of-the-art chemical manufacturing facilities in mainland of China. Our mission is to help our customers achieve the highest quality at the lowest costs, and in the quickest time for their drug discovery and development programs As one of the leading manufacturers of phase transfer catalysis (PTC) and cationic surfactant, We provide a comprehensive range of quaternary ammonium salts, quaternary phosphonium salts, crownethers, quaternary ammonium hydroxide and other series;. Backed by the global manufacturing network of our honored partnerships, we offer customers the highest quality and purity in fine chemical products. We are accustomed to ... more