Thermo Scientific Sterilin petri dishes are manufactured in virgin polystyrene and produced aseptically under clean room conditions (class 7, ISO14644) to exclude microbiological contamination or terminally sterilised by gamma irradiation. The 90mm dishes comply with BS611 Part 2 and are CE-marked in compliance with the In-vitro Directive 97/79/EC. precision moulded to ensure a high optical clarity. Supplied in sleeves within partitioned cases as indicated for added protection during transit.