Butyl Rubber Stopper 1)Designed as per GMP standards 2)ISO9001-2000,YBB00042005 3)Size:13/20/28/32/34mm 4)Color:Grey,red 1) Material: bromo-butyl and chloro-butyl rubber2) Color: grey,red,black,green,etc3) Automatic inspected4) Packed in clean room (Class-100) 1)Designed as per GMP standards,the workshops of vulcanization,die cutting,washing and packaging are up to the relative cleanness classes. ...