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Filtration Products
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  Ultrafiltration
 
PREFILTERS & DEPTH MEDIA
  Prefilters are often prepared from depth-type media, a random matrix of material which may or may not contain binder. These filters trap particles within the matrix and therefore have a high loading capacity. But because of this design, these filters do not have a clearly defined pore size, only a nominal rating.
  These filters have applications outside of prefiltration, such as air and water pollution analysis, liquid clarification, and cell harvesting.
  Advantec MFS prefilters are made of a variety of materials. Click on one of the following links for more information:
Glass Fiber Filter Quartz Fiber Filter
Cellulose Fiber Filter PTFE Fiber Filter
Polyester Mesh Separators

Also, see our Membrane Filters.
 
SEM Image: PTFE Fiber

SEM Image: Glass Fiber
  If used as a prefilter, the filter should have a slightly smaller diameter than the filter membrane it precedes:
Filter Holder Model
(Vacuum Type)
Recommended Prefilter Diameter (mm)
If preceding final filter
If used as final filter
25mm models
KG 25, KGS 25
16
25
47mm models
KG 47, KGS 47, KSF 47, KGS 47 TF
35
47
90mm models
KG 90, KGS 90
70
90

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Filter Holder Model
(Positive Pressure Type)
Recommended Prefilter Diameter (mm)
If preceding final filter
If used as final filter
13mm models
KS 13
8
13
25mm models
KS 25, LS 25, LP 25, KS 25F, PP 25
21
25
47mm models
KS 47, KST 47, KS 47F, LS 47HP
35
47
PP 47, PFA 47
42
47
 
Glass Fiber Prefilters
 
Prefilters made of dense borosilicate glass fibers:
  • Biologically inert with high chemical and thermal resistance
  • Unaffected by humidity and can be stored indefinitely
  • Can be easily sterilized by autoclave or baking
    Contact us for more information on this line of products.


      Product Specifications*

    Type
    Applications/Comments
    Weight (g/m2)
    Thickness (mm)
    Nominal Rating (μm)
    Binder
    Max. Temp. (°C)
    GA-55
    General purpose paper; suitable for air pollution monitoring
    55
    0.21
    0.6
    None
    500
    GF-75
    Most retentive grade; suitable for collection of IgC or other very fine protein precipitates; use to clarify aggressive chemical solutions; suitable for TCLP (EPA Method 1311) when used with KST142.
    75
    0.35
    0.3
    None
    500
    GA-100
    General purpose paper; suitable for filtration of precipitated cells or proteins, and air pollution monitoring
    110
    0.44
    1.0
    None
    500
    GA-200
    Thick paper; suitable for filtering viscous fluids such as liquid sugars and gels
    175
    0.74
    0.8
    None
    500
    GB-100R
    Has low trace metal content; suitable for DNA?RNA and protein precipitates
    95
    0.40
    0.6
    None
    500
    GB-140
    Thick with moderate wet strength and loading capacity; suitable for industrial waste analysis
    140
    0.56
    0.4
    None
    500
    GC-50
    For use with 0.45μm or smaller membrane filter; suitable for scintillation counting and filtration of suspensions in industrial and waste water
    48
    0.19
    0.5
    None
    500
    GC-90
    High wet strength; suitable for clinical screening
    100
    0.30
    0.5
    Organic
    120
    GD-120
    High wet strength and high loading capacity
    123
    0.51
    0.9
    None
    500
    GS-25
    High wet strength with moderate loading capacity
    70
    0.22
    0.6
    Organic
    120
    DP-70
    High wet strength and loading capacity; suitable for dust mearurement
    170
    0.52
    0.6
    Organic
    120
    *For additional specifications, click here.
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    Quartz Fiber Prefilters
     
    Prefilters made of silica quartz fibers:
  • Biologically inert with highest chemical and thermal resistance
  • Unaffected by humidity and can be stored indefinitely
  • High purity prefilters contain low trace metal content
  • Can be easily sterilized by autoclave or baking
    Contact us for more information on this line of products.


      Product Specifications*

    Type
    Applications/Comments
    Weight (g/m2)
    Thickness (mm)
    Nominal Rating (μm)
    Binder
    Max. Temp. (°C)
    QR-100
    Suitable for high temperature filtration
    85
    0.38
    N/A
    None
    1000
    QR-200
    Suitable for high temperature filtration
    200
    1.0
    N/A
    Inorganic
    1000
    *For additional specifications, click here.
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    Cellulose Fiber Prefilters
     
    Prefilters made of high quality cellulose fibers - contain no binder:
  • Inert to organic solvents
  • Use as a prefilter to prolong membrane filter life
    Contact us for more information on this line of products.


      Product Specifications*

    Type
    Applications/Comments
    Weight (g/m2)
    Thickness (mm)
    Nominal Rating (μm)
    Binder
    Max. Temp.
    (°C)
    No. 27
    Suitable for clarifying beverages and non-viscous oil and petroleum products
    N/A
    0.68
    N/A
    None
    120 (180 in oil)
    No. 1640
    Suitable for removing fine particles, such as activated charcoal from alcoholic beverages
    N/A
    0.40
    N/A
    None
    120 (180 in oil)
    No. 1650
    Similar to No. 1640, but withstands higher pressure and has faster flow rate
    N/A
    0.57
    N/A
    None
    120 (180 in oil)
    *For additional specifications, click here.
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    PTFE Fiber Prefilters
     
    Prefilters made of pure PTFE fibers:
  • PTFE fibers are sintered to minimize fiber slough-off
  • Hydrophobic filter suitable for venting gasses
  • Thermostable to 260°C
    Contact us for more information on this line of products.


      Product Specifications*

    Type
    Applications/Comments
    Weight (g/m2)
    Thickness (mm)
    Nominal Rating (μm)
    Binder
    Max. Temp. (°C)
    PF020
    Suitable for venting air and gas or filtering hot acids/strong solvents; works well for both aqueous and non-aqueous filtration
    500
    0.54
    2
    None
    260
    PF040
    500
    0.95
    4
    None
    260
    PF050
    210
    0.36
    5
    None
    260
    PF060
    240
    0.50
    6
    None
    260
    PF100
    500
    1.00
    10
    None
    260
    *For additional specifications, click here.
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    Polyester Mesh Separators
     
    Separation sheets used to increase preformance in serial stack filtration:
  • Prevent pore binding by placing separator between two membrane filters in series
  • Increase flow rate and filtrate throughput
    Contact us for more information on this line of products.
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    Glass Fiber Quartz Fiber Cellulose Fiber
    PTFE Fiber Mesh Separators