Zhengzhou Sigma Chemical Co., Ltd., takes scientific research as the leading to production, with a high starting point and high-tech enterprise. Our company with independent imported &exported trade license, based on scientific research and produced APIs, chemical intermediate , fine chemicals and so on, have three production bases located respectively in Shandong, Xinxiang, Puyang. We have our own R＆D center, production factory, QC center, Trade department. Chemical products includes...