Profile: Phchem Co., Ltd. focuses on researching, developing, manufacturing, marketing and trading of water treatment chemicals. Our oxytetracycline base is a yellow crystalline powder with specific optical rotation ranging between -203 and -216. Natural L-tartaric acid is an organic acid with the raw material of tartar/wine stone. Our barium oxide is a white hygroscopic compound formed by the burning of barium in oxygen. It transforms into barium hydroxide on contact with water. It is used as desiccant additive and dehydrating agent.