Membranfilter, Whatman™

Leverandør: Whatman products (Cytiva)
7181-002 7181-004 7182-001 7182-002 7182-004 7182-009 7182-014 7184-001 7184-002 7184-004 7184-005 7184-009 7184-014 7186-004 7188-002 7188-003 7188-004 7188-009 7190-002 7190-004 7191-005 7191-014 7193-002 7193-004 7195-002 7195-004 7195-009 10400012 10400014 10400106 10400112 10400114 10400206 10400212 10400214 10401106 10401112 10401114 10401118 10401121 10401126 10401131 10401312 10401314 10402012 10402014 10405079
514-0544EA 3550 NOK
514-0544 514-0545 514-0546 514-0547 514-8072 514-0548 514-0549 514-0550 514-0551 514-8073 514-0104 514-0553 514-0554 514-0556 514-0557 514-0558 514-0559 514-0560 514-0561 514-0562 514-0564 514-0949 514-0565 514-0566 514-0567 514-0568 514-0569 514-2202 514-2203 514-2211 514-2212 514-2213 514-2221 514-2222 514-2223 514-2251 514-2252 514-2253 514-0758 514-0759 514-0760 514-0761 514-2262 514-2263 514-2272 514-2273 514-0766
Membranfilter, Whatman™
Filter Membranfilter
Cellulose nitrate membranes, circles, plain. Recommended for the majority of routine applications, this membrane is manufactured under strictly controlled conditions.

  • Narrow pore size distribution for improved surface capture and analysis
  • Low levels of extractables to ensure sample integrity

The user will benefit from the performance improvements that are now available in Whatman membrane filters, including very narrow pore size distribution and low levels of extractables. 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.

One of the major features of Whatman membrane filters is the narrow distribution of pore sizes. The rated pore size of these membranes is closely controlled due to an advanced manufacturing and control system. Additionally, batch-to-batch variation is minimised providing more consistent laboratory results.

Membrane filters are normally autoclaved at 121 °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 low shrinkage during autoclaving.

This is the standard membrane filter for the majority of laboratory applications involving particles and cells in the range of 0,1 to 12,0 µm. The residue after filtration is found to be almost completely on the surface of the membrane allowing physical recovery of deposits and microscopic examination.
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