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This is the Whatman cellulose nitrate membrane filter. For most routine applications; can replace other general-purpose membranes without significant changes in technique. Among the strongest of their type with noticeably improved flexibility and tolerating abuse without sacrificing integrity. Other features and benefits include: Low level of extractables—generally below that of other similar membranes. Advanced manufacturing ensures narrow pore size distribution and minimal batch-to-batch variation. Autoclavable at 121°C (250°F), with low shrinkage. Overheating to 130°C (266°F) can be tolerated without damage. May be autoclaved two or three times without major changes in physical properties. Gridded circles available. 25/Pack. Whatman #: 7195-009.