Profile: Tianjin Wurui Chemical Import & Export Co., Ltd. is a manufacturer of chemical raw materials. We are an ISO 9001 and ISO 14001 certified company. Our products include carbon black, lithopone, zinc oxide, copper oxide, titanium dioxide, thiourea, sodium tripolyphosphate, formic acid, sodium hexametaphosphate, caustic soda flakes, chromium trioxide, copper sulfate, glacial acetic acid, iron oxide, pentaerythritol and zinc sulfate. Our chromium trioxide is used as an oxidizer in dyeing and printing industry. It is also used in preservation of timber. Our oxalic acid forms fine colourless crystals. It is soluble in water, and is used as a purifying agent in the pharmaceutical industry.