Whatman 10405079 Cellulose AE98/5 Nitrate Circles Plain Filter Membrane with Hydrophobic Rim, 50mm Membrane, 8 Micron (Pack of 100)

Most membranes are inherently brittle and difficult to handle; it is not uncommon for filters to be damaged during loading into holders or while in use. Whatman cellulose nitrate membrane filters have a noticeably improved flexibility and are made to tolerate abuse during handling, loading and autoclaving without sacrificing integrity. These membranes are among the strongest of their type available, as measured and compared by burst pressure tests. The level of extractables in membrane filters has become more important with advances in filtration or adsorption techniques. In particular, pharmaceutical, immunological and biomedical tissue culture and trace analysis applications can be adversely affected by high extractable levels. Whatman cellulose nitrate membrane filters have a low level of extractables, generally below that of other membranes of a similar type. The rated pore size of these membranes is closely controlled due to the advanced manufacturing and control system. Additionally, the batch-to-batch variation is minimized providing more consistent laboratory results. Membrane filters are normally autoclaved at 121 degree c without loss of integrity. Cellulose nitrate membranes are supplied as circles, sheets or reels. Excessive shrinkage can cause problems during autoclaving and is often the cause of membranes tearing in their holders after autoclaving. It may also cause a reduction in flow rate and total throughput. Whatman membranes exhibit a low shrinkage during autoclaving. Applications: sample preparation, microbiological studies, filtration of aqueous solutions. Burst strength: >2 psi. Weight: 3.6 to 5.5 mg/cm square. Porosity: 66 to 84 percent. Steam autoclavable: yes. Hydrophilic: yes.

• Higher strength and flexibility
• Low extractable levels
• Narrow pore size distribution
• Increased temperature stability
• Reduced shrinkage