Zhengzhou Aoxiang pharmaceutical packing Co.,Ltd is a new modern high technology enterprise and an appointed company to produce butyl rubber pharma-stopper, which was approved by SDA(State Drug Administration) on August22,1996.The factory building was designed and built according to GMP norm strictly by the medical designing institute of Chongqing in August of 1997,put into operation by October of 1999. The departments of vulcanization, punching, washing and packing are clean rooms respectively in accordance with certain clean grades,300,000 grade,100,000 grade,10,000 grade, and in which the inner packing room is up to the grade of 100.