20mm Round Bottom Stoppers, gamma-Irradiated at a minimum 25 kGy (Cobalt-60).
Made of bromobutyl rubber, free of natural rubber latex.
Independent 3rd party testing for CFU and Endotoxins.
Packaged in a double-polyethylene bag with gamma-irradiation indicator.
Each bag is lot labeled for traceability to both your CFU/Endotoxin testing paperwork and invoice.