Filter Papers and Membrane Filters

We offer a complete range of cellulose filter papers, glass and quartz fiber filters, and membrane filters. Cellulose filter papers enable filtration of larger particles (up to 25 µm), while glass and quartz fiber filters combine fast flow rates, high loading capacities, and retention of very fine particles (0.7 to 2.7 µm). Membrane filters are ...

We offer a complete range of cellulose filter papers, glass and quartz fiber filters, and membrane filters. Cellulose filter papers enable filtration of larger particles (up to 25 µm), while glass and quartz fiber filters combine fast flow rates, high loading capacities, and retention of very fine particles (0.7 to 2.7 µm). Membrane filters are recommended for retention of very small particles or for microbiological purposes. Our membrane filter offering includes pore sizes from 0.015 to 12 µm.

Whatman filter papers and membranes are world-renowned as a standard for laboratory filtration and are associated with quality, reliability, and reproducibility. Flat filters are widely used for general sample filtration in various fields such as quality control, environmental monitoring, and research. Sample filtration is usually either for particle removal or for particle/precipitate collection prior to analysis.

Specifications

Filter Papers and Membrane Filters There are 84 products.

Subcategories

  • Grade 1 Circles - Qualitative Filter Paper

    The most widely used filter paper for routine applications with medium retention and flow rate. Extended range of sizes includes 10 to 500 mm diameter circles and 460 x 570 mm sheets. This filter is also available in the FilterCup, this is a convenient, disposable 70 mm filter funnel with a 250 ml capacity molded from polypropylene with an integral, heat bonded filter (catalog number 1600-001).
    This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids. Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot), and calcium carbonate.
    In agriculture, it is used for soil analysis and seed testing procedures. In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.
    In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically. For gas detection, the paper is impregnated with a chromogenic reagent and color formation quantified by optical reflectance.

  • Grade 2 Circles - Qualitative Filter Paper

    Slightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed). More absorbent than Grade 1. In addition to general filtration in the 8 µm particle size range, the extra absorbency is utilized, for example, to hold soil nutrient in plant growth trials. Also used for monitoring specific contaminants in the atmosphere and in soil testing. Also available prepleated as Grade 2V.

  • Grade 3 Circles - Qualitative Filter Paper

    Double the thickness of Grade 1 with still finer particle retention and excellent loading capacity; more precipitate can be held without clogging. The extra thickness gives increased wet strength and makes this grade highly suitable for use in Büchner funnels. The high absorbency is particularly valuable when the paper is used as a sample carrier. This filter is also available in the FilterCup. This is a convenient, disposable 70 mm filter funnel with a 250 ml capacity molded from polypropylene with an integral, heat bonded filter (catalog number 1600-003).

  • Grade 4 Circles - Qualitative Filter Paper

    Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis. Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

  • Grade 5 Circles - Qualitative Filter Paper

    The maximum degree of fine particle filtration in the qualitative range. Capable of retaining the fine precipitates encountered in chemical analysis. Slow flow rate. Excellent clarifying filter for cloudy suspensions and for water and soil analysis. Also available prepleated as Grade 5V.

  • Grade 6 Circles - Qualitative Filter Paper

    Twice as fast as Grade 5 with similar fine particle retention. Often specified for boiler water analysis applications.

  • Nuclepore Track-Etched Polycarbonate (Hydrophilic) Membranes

    Nuclepore track-etched polycarbonate (hydrophilic) membrane, circle

    • Low protein binding and low extractables ensuring no sample contamination.
    • High chemical resistance and good thermal stability for a wide range of samples.
    • Low, consistent ash and low tare weights.
    • Smooth flat surface for good visibility of particles.

    Nuclepore track-etched polycarbonate membranes are manufactured from high-quality polycarbonate film and have sharply defined pore sizes, high flow rates, and excellent chemical and thermal resistance. The membranes have a smooth flat surface and exhibit very low levels of extractables.

  • Cyclopore PC Polycarbonate Membranes

    Cyclopore PC membrane, circle

    • Low affinity for stains provides higher optical contrast and makes visibility under a microscope easy.
    • True surface capture provides easy examination of samples and short analysis times.
    • Totally transparent membranes available.
    • Negligible absorption and adsorption of filtrate; nonhygroscopic.
    • Low tare weights.
    • No particle shedding provides ultra clean filtrate.
    • Biologically inert.

    Whatman Cyclopore membranes are true pore size microporous membranes featuring the sharp cut-off and reproducible microfiltration performance characteristics of track-etched membranes. The smooth flat membrane ensures particles are retained on the surface so that they are easily visible under a microscope.

    Cyclopore membranes are manufactured using proprietary Whatman technology to produce a precision membrane filter with a closely controlled pore size distribution.

    Membranes are produced from a pure polymeric film and give exceptional chemical cleanliness. They are free of contaminants, have low tare weight, minimum water adsorption, and very low levels of nonspecific protein binding.

    The polycarbonate membranes are hydrophilic and are available in a choice of diameters and pore sizes. The polyester membranes are resistant to most organic solvents, amides, and halogenated hydrocarbons. This broad chemical compatibility makes polyester membranes suitable for the detection of particles in many corrosive fluids.

    Higher strength and flexibility

    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.

    Low extractable levels

    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.

    Narrow pore size distribution

    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 the advanced manufacturing and control system. Additionally, the batch-to-batch variation is minimized providing more consistent laboratory results.

    Increased temperature stability

    Membrane filters are normally autoclaved at 121°C without loss of integrity. Cellulose nitrate membranes are supplied as circles, sheets, or reels.

    Reduced shrinkage

    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.

    White plain filters

    This is the standard membrane filter for the majority of laboratory applications involving particles and cells in the range of 0.1 µm to 12.0 µm. The residue after filtration is found to be almost completely on the surface of the membrane and allows physical recovery of deposits and microscopic examination.

  • Various Membrane Circles
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Showing 1 - 12 of 84 items
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    ₪‎34.00

    Grade 1 Qualitative Filter Paper Standard Grade, circle, 55 mm Grade 1 qualitative filter paper circles These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎34.00
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    ₪‎34.00

    Grade 1 Qualitative Filter Paper Standard Grade, circle, 70 mm Grade 1 qualitative filter paper circles These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎34.00
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    ₪‎43.00

    Grade 1 Qualitative Filter Paper Standard Grade, circle, 42.5 mm Grade 1 qualitative filter paper circles These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat...

    ₪‎43.00
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    ₪‎44.00

    Grade 1 Qualitative Filter Paper Standard Grade, circle, 47 mm Grade 1 qualitative filter paper circles These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎44.00
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    ₪‎279.00

    Grade 1 Qualitative Filter Paper Standard Grade, circle, 270 mm Grade 1 qualitative filter paper circles These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎279.00
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    ₪‎45.00

    Grade 2 Circles,  55mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎45.00
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    ₪‎137.00

    Grade 2 Circles,  150mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎137.00
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    ₪‎193.00

    Grade 2 Circles,  185mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎193.00
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    ₪‎52.00

    Grade 2 Circles,  42.5mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎52.00
  • Quick view
    ₪‎51.00

    Grade 2 Circles,  47mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎51.00
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    ₪‎57.00

    Grade 2 Circles,  70mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎57.00
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    ₪‎72.00

    Grade 2 Circles,  90mm  100/pk These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

    ₪‎72.00
Showing 1 - 12 of 84 items