... competitive price 3.GMP, ISO 9001,COA,YBB,EP Rubber Stopper/bung 20mm 20-B2+ butyl rubber stopper1.Customization2.Good ... chlorobutyl rubber or bromobutyl rubber.Detailed Product Description20mm Pharmaceutical rubber stopper of antibiotic bottlesScope of application: it is suitable for ... overseas more, looking forward to open your medical rubber stopper and flip off cap market together with you.If you ...