Upper part made of PP, lower part of PS. With CN membrane. Designed for ease of use and better performance. Upper twists off easily for improved retrieval of the 47 mm membrane. Wider base is stable on the bench. Non-silicone gasket minimizes risk of contamination. Excellent for microbiological analysis, sterility testing, water quality or environmental testing. Easy-opening bag. - Acc. to ISO 7704. - Sterile. - Graduated. Upper part made of PP, lower part of PS. With CN membrane. Designed for ease of use and better performance. Upper twists off easily for improved retrieval of the 47 mm membrane. Wider base is stable on the bench. Non-silicone gasket minimizes risk of contamination. Excellent for microbiological analysis, sterility testing, water quality or environmental testing. Easy-opening bag. - Acc. to ISO 7704. - Sterile. - Graduated.