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Filtration Products
 Membranes  Prefilters  Filter Papers & Thimbles  Microbiological Products
 Filtration Accessories  Filter Holders  Cartridges and Capsules  Disposable Syringe Filter Units
 Ultrafiltration  Food Analysis Products  Chromatography Products  Cartridge Housings
 Environmental Monitoring Products
 
FILTER PAPERS AND THIMBLES
Click on the following links for information on each product:
Qualitative Filter Papers Quantitative Filter Papers
Phase Separating Filter Papers Extraction Thimbles
 
Qualitative Filter Papers
 
Qualitative filter paper for precipitate removal and qualitative analysis preparation:
  • Made of 100% alpha cotton cellulose; Ash content 0.1%
  • Stable from pH 0 ~ 12; thermostable up to 120°C
    Contact us for more information on this line of products, including conversions to other manufacturers' products.


      Product Specifications

    Type
    Applications/Comments
    Weight
    (g/m2)
    Thickness
    (mm)
    Retention Characteristics
    (μm)
    Collection Efficiency
    (%, 0.3μm DOP)
    No. 1
    Retains large crystalline particles and gelatinous precipitates. Fast flow rate, smooth surface, normal hardness.
    90
    0.20
    Coarse (6)
    65
    No. 2
    Retains medium crystalline particles. Fast flow rate, smooth surface, normal hardness.
    125
    0.26
    Medium (5)
    80
    No. 231
    Retains crystalline particles. Moderate flow rate, smooth surface, normal hardness.
    95
    0.18
    Medium
    -
    No. 232
    Retains medium to medium-fine particles. Slow flow rate, smooth surface, normal hardness.
    90
    0.18
    Medium/ Medium Fine
    -
    No. 131
    High retention efficiencey for fine particles, like barium sulfate. Slow flow rate, smooth surface, normal hardness.
    140
    0.25
    Medium-Fine (3)
    90
    No. 235
    Highest retention efficiency, retaining very fine particles. Very slow flow rate, smooth surface, normal hardness.
    95
    0.17
    Very Fine
    -
    No. 101
    Seed germination; retains large particles.
    80
    0.21
    Coarse and Gelatinous (6-7)
    -
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    Quantitative Filter Papers
     
    Quantitative filter paper for gravimetric analysis or environmental monitoring:
  • Made of Highest quality alpha cotton cellulose; "Ashless" (Ash content 0.01%)
  • Acid washed and rinsed with ultrapure water to neutralize
    Contact us for more information on this line of products, including conversions to other manufacturers' products.


      Product Specifications

    Type
    Applications/Comments
    Weight
    (g/m2)
    Thickness
    (mm)
    Retention Characteristics (μm)
    Collection Efficiency
    (%, 0.3μm DOP)
    No. 3 Ashless
    Retains medium particles, fast flow rate. For analysis of soils, fertilizers, cement, and minerals.
    113
    0.23
    Medium (5-10)
    80
    No. 5A Ashless
    Retains coarse particles and gelatinous precipitates, fast flow rate. For filtration of hydroxides, metallic aerosols, environmental monitoring, silica content determination in steel.
    97
    0.22
    Coarse and Gelatinous (>10)
    75
    No. 5B Ashless
    Retains medium particles, such as CaCO3, CaCO4, PbSO4, MnCO3, ZnCO3, ZnS, AgCl
    108
    0.21
    Medium (5-10)
    90
    No. 5C Ashless
    Retains fine particles, such as SrSO4, BaSO4, HgCrO4, and collodial dispersions. Filter for general gravimetric analysis.
    118
    0.22
    Fine (<5)
    93
    No. 6 Ashless
    Retains medium-fine particles, trace, and precious metals.
    103
    0.20
    Medium-Fine (2-10)
    90
    No. 7 Ashless
    Highest purity for retaining medium particles. Filter for precise gravimetric analysis.
    87
    0.18
    Medium (5-10)
    85
    No. 4A Hardened Ashless
    Retains fine particles, slow flow rate. High wet strength, suitable for use under high pressure, with good pH and chemical resistance.
    96
    0.12
    Very Fine (<5)
    90
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    Phase Separating Filter Papers
     
    Hydrophobic filter paper for aqueous/non-aqueous separation:
  • Available as Silicon-treated Cellulose PTFE
  • Both available in sheets and disks
    Contact us for more information on this line of products.


      Product Specifications

    Type
    Filter Material
    Weight
    (g/m2)
    Thickness
    (mm)
    Nominal Rating (μm)
    Collection Efficiency
    (%, 0.3μm DOP)
    2S
    Silicone-treated Cellulose
    120
    0.26
    5
    -
    PF020
    PTFE
    500
    0.54
    2
    99.9
    PF040
    PTFE
    500
    0.95
    4
    95
    PF050
    PTFE
    210
    0.36
    5
    85
    PF060
    PTFE
    240
    0.50
    6
    75
    PF100
    PTFE
    500
    1.00
    10
    70
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    Extraction Thimbles
     
    Thimble filters useful for a variety of analytical procedures:
  • No. 84 - Cellulose Thimbles: Suitable for Soxhlet type extractions or dust sampling. Lipid content <0.1% by weight.
  • No. 86R - Glass Fiber Thimbles: Made of strong borosilicate glass fibers, resitant to high temperatures 500°C and most acids.
  • No. 88R, 88RH - Silica Fiber Thimbles: Made of quartz fibers, resitant to 1000°C. Tapered for easy stack sampler loading.
  • No. 89, 895 - PTFE Fiber and PTFE/Silica Fiber Thimbles: Durable, temperature-resistant thimbles with minimal trace metals.
    Contact us for more information on this line of products, including conversions to other manufacturers' products.


      Product Specifications

    Type
    Filter Material
    Weight
    (g/m2)
    Thickness
    (mm)
    Nominal Rating (μm)
    Collection Efficiency
    (%, 0.3μm DOP)
    84
    Cellulose
    3.6
    1.5
    8
    89
    86R
    Borosilicate Glass Fiber
    1.8
    1.6
    1
    >99.9
    88R
    Quartz/Silica Fiber
    2.2
    1.6
    -
    >99.9
    88RH
    Quartz/Silica Fiber
    2.2
    1.6
    -
    >99.9
    89
    PTFE Fiber
    11.0
    1.8
    -
    >99.9
    89S
    PTFE-Silica Fiber
    6
    1.6
    -
    >99.9
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    Qualitative Filter Papers Quantitative Filter Papers
    Phase Separating Filter Papers Extraction Thimbles