National Institute of Metrology,China
Telephone010-64524710
Websitehttp://www.ncrm.org.cn
Wuhan Hezhong Biochemical Manufacturing Co., Ltd.
Telephone18062666868
Websitehttp://www.whyctech.com;www.hbycgroup.com
GN Chemicals Co., Ltd
Telephone0311-85902108
Websitehttp://www.gnchemicals.com
Qingdao Rawchem Imp&Exp Co.,Ltd.
Telephone+86-755-82228539
Websitehttp://www.rawchemical.cn/