SJZ Chenghui Chemical Co., Ltd. is located in Shijiazhuang, the capital of Hebei Province, 270km away from the south of Beijing. We are mainly specializing in manufacturing, import and export of chemical products. Our major businesses are: 1. Sulfanilic acid, we have been mainly engaging in manufacturering and sale in Sulfanilic acid for a more than 20 years, we are the earliest and largest producer in China, and have been selling our product to many areas in the world. 2. Optical Brightener ...