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چهارشنبه 28 آذر 1397

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ممبران فیلتر واتمن

جهت دریافت قیمت لطفا با شماره تلفن 88920648 تماس حاصل فرمائید

ممبران فیلترهای سلولز استات ساخت کمپانی واتمن

Whatman cellulose acetate membranes are made from pure cellulose acetate making them suitable for biological and clinical analysis, sterility tests, and scintillation measurements.

Cellulose acetate membrane filters exhibit very low protein binding capacity. They are hydrophilic making them suitable for aqueous and alcoholic media. The cellulose acetate membranes have improved solvent resistance, particularly to low molecular weight alcohols and increased heat resistance. With high physical strength, the membrane filters can be used up to 180ºC, are suitable for hot gases, and can be sterilized by all methods without sacrificing the integrity of the membrane.


Cellulose Acetate Membrane (Type ST 68, 0.8 µm)

Typical Properties - Cellulose Acetate Membranes
Pore Size (µm)
(membrane type)
Thickness
(µm)
Water flow rate
Δp = 0.9 bar
(s/100 ml/12.5 cm2)
Bubble point (bar)
0.2  (OE 66) 115 26 4
0.45 (OE 67) 115 12 3.1
0.8  (ST 68) 140 16 1.5
1.2  (ST 69) 140 12 0.9



ممبران فیلترهای نیترات سلولز واتمن

Recommended for the majority of routine applications, this membrane is manufactured under strictly controlled conditions. The user will benefit from the performance improvements which are now available in Whatman membrane filters, including very narrow pore size distribution and low levels of extractables.

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.

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

    Applications
    • Sample preparation
    • Microbiological studies
    • Filtration of aqueous solutions

    Filter types

    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.

    Gridded filters
    Gridded filters makes it easier to count particles, microorganisms and colonies. If a gridded membrane is required please see Mixed Cellulose Ester Membranes.

    Typical Data - Cellulose Nitrate Membranes

    Cellulose Nitrate
    Thickness 105 to 140 µm
    Burst strength > 2 psi
    Weight 3.6 to 5.5 mg/cm2
    Maximum service temperature 80ºC
    Porosity 66 to 84%
    Steam autoclavable Yes
    Hydrophilic Yes

     
    Typical Applications - Cellulose Nitrate Membranes
    Field of application Pore size (µm)
    General  
    Microfiltration 0.1
    Ultracleaning 0.1
    Sterilizing 0.2
    Bulk bacterial removal 0.45
    Analytical precipitates 0.65
    Clarifying filtration 1
    Particle removal 5
    Water microbiology and analysis
    Bacterial colony count 0.45 (gridded) - See Mixed Cellulose Ester membranes
    Sediment analysis 0.45
    Suspended particles 5
    Air pollution monitoring
    Asbestos monitoring (NIOSH) 0.8
    Food and beverage QC
    E. coli and Coliforms 0.45 (gridded) - See Mixed Cellulose Ester membranes
    Total bacteria count 0.2
    Tissue culture
    Mycoplasma removal 0.1
    Sterile filtration 0.2


  • Ordering Information - Cellulose Nitrate Membranes
    Catalog Number Description
    0.1 μm Pore Size
    7181-002 Cellulose nitrate circles, plain, 0.1 µm 25 mm 100/pk
    7181-004 Cellulose nitrate circles, plain, 0.1 µm 47 mm 100/pk
    10402014 Cellulose nitrate circles, plain, 0.1 µm 50 mm 100/pk
    0.2 µm Pore Size
    7182-001 Cellulose nitrate circles, plain, 0.2 µm 13 mm 100/pk
    7182-002 Cellulose nitrate circles, plain, 0.2 µm 25 mm 100/pk
    7182-004 Cellulose nitrate circles, plain, 0.2 µm 47 mm 100/pk
    10401314 Cellulose nitrate circles, plain, 0.2 µm, 50 mm 100/pk
    7182-009 Cellulose nitrate circles, plain, 0.2 µm 90 mm 25/pk
    7182-014 Cellulose nitrate circles, plain, 0.2 µm 142 mm 25/pk
    0.45 µm Pore Size
    7184-001 Cellulose nitrate circles, plain, 0.45 µm 13 mm 100/pk
    7184-002 Cellulose nitrate circles, plain, 0.45 µm 25 mm 100/pk
    7184-004 Cellulose nitrate circles, plain, 0.45 µm 47 mm 100/pk
    10401170 Cellulose nitrate circles, plain, sterile, 0.45 µm 47 mm 100/pk
    10401114 Cellulose nitrate circles, plain, 0.45 µm, 50 mm 100/pk
    7184-009 Cellulose nitrate circles, plain, 0.45 µm 90 mm 25/pk
    10401121 Cellulose nitrate circles, plain, 0.45 µm, 100 mm 50/pk
    10401126 Cellulose nitrate circles, plain, 0.45 µm, 110 mm 50/pk
    7184-014 Cellulose nitrate circles, plain, 0.45 µm 142 mm 25/pk
    7184-029 Cellulose nitrate circles, plain, 0.45 µm 293 mm 25/pk
    0.65 µm Pore Size
    7186-004 Cellulose nitrate circles, plain, 0.65 µm 47 mm 100/pk
    0.8 µm Pore Size
    7188-002 Cellulose nitrate circles, plain, 0.8 µm 25 mm 100/pk
    7188-003 Cellulose nitrate circles, plain, 0.8 µm 37 mm 100/pk
    7188-004 Cellulose nitrate circles, plain, 0.8 µm 47 mm 100/pk
    7188-009 Cellulose nitrate circles, plain, 0.8 µm 90 mm 25/pk
    1 µm Pore Size
    7190-002 Cellulose nitrate circles, plain, 1 µm 25 mm 100/pk
    7190-004 Cellulose nitrate circles, plain, 1 µm 47 mm 100/pk
    1.2 µm Pore Size
    7191-005 Cellulose nitrate circles, plain, 1.2 µm 50 mm 100/pk
    7191-014 Cellulose nitrate circles, plain, 1.2 µm 142 mm 25/pk
    3 µm Pore Size
    7193-002 Cellulose nitrate circles, plain, 3 µm 25 mm 100/pk
    7193-004 Cellulose nitrate circles, plain, 3 µm 47 mm 100/pk
    5 µm Pore Size
    7195-002 Cellulose nitrate circles, plain, 5 µm 25 mm 100/pk
    7195-004 Cellulose nitrate circles, plain, 5 µm 47 mm 100/pk
    10400214 Cellulose nitrate circles, plain, 5 µm, 50 mm 100/pk
    7195-009 Cellulose nitrate circles, plain, 5 µm 90 mm 25/pk
    8 μm Pore Size
    10400106 Cellulose nitrate circles, plain, 8 µm, 25 mm 100/pk
    10400112 Cellulose nitrate circles, plain, 8 µm, 47 mm 100/pk
    10400114 Cellulose nitrate circles, plain, 8 µm, 50 mm 100/pk
    10405079 Cellulose nitrate circles, plain, with hydrophobic rim, 8 µm 50 mm 100/pk
    12 µm Pore Size
    10400012 Cellulose nitrate circles, plain, 12 µm, 47 mm 100/pk
    10400014 Cellulose nitrate circles, plain, 12 µm, 70 mm 100/pk

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