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Filtration

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Lab filtration paper comes in an array of grades and material for different purposes. Scientists and lab technicians use it for analytical and industrial applications in health care, biosciences, the food sector, environmental services, education, and agriculture. This paper normally works with lab instruments that include funnels, tubes, and flasks in which solutions are mixed or isolated for experimentation and analysis. However, some filtration products also include nylon disks for drawing liquid samples with syringes, filtration flasks for distillation or vacuum filtration, as well as extraction thimbles for drawing samples of solids. Staples® has a wide range of filtration products and other essential lab equipment.

Different Applications of Filtration Paper
The broad laboratory and industrial applications of filter paper consist of purification, including the removal of coarse and fine particulates, content and particulate assaying, the separation of solutions and compounds into distinct components, and the capture and retention of liquids for analysis. Technicians may use this paper in qualitative analytical separations of solid particulates from samples for such tasks as air pollution monitoring and soil analysis.

Industrial applications range from the removal of sediment from wine, beer, spirits, cooking oils, essential oils, and juices to the capture of blood and bodily fluids for healthcare and bioscience testing. This type of paper also goes in air fresheners, helps maintain the moisture of seeds, provides protective layering for products, and is a major part of industrial air purification systems.

Materials That Go Into Filter Paper
Given the vast array of applications of paper filtration products, manufacturers use different material for the filter membranes. One of the popular membrane materials is cellulose, because the material provides an array of pore sizes suitable for filtering minute and large particulates. In addition, some cellulose products, including mixed cellulose ester and cellulose combined with cotton linters, are "ashless" lab filter paper, providing higher levels of membrane purity. Syringe filters are typically made of plastic or nylon and are used to filter out particulates in small samples. Other filtration material includes borosilicate glass, polypropylene, and glass fiber.

What Are the Important Characteristics of Filtration Paper?
These filtration products must offer specific features to support valid analysis. One is a proper liquid flow rate, or velocity. Another is the particle retention rate, or the efficiency of the paper in removing particulates from air or gas. The third is the loading capacity rate, or the volume of particulates that the membrane captures while maintaining a desired flow rate. This paper is also categorized by whether it’s hydrophilic, meaning that it’s amenable to liquid analysis, or hydrophobic, meaning that it’s water-repellent, suitable for gas filtration and venting applications. One last designation is whether it’s high or low protein binding. Low protein binding paper is required for analysis of proteins, since the proteins aren’t absorbed into the membrane.

How Is Filter Paper Designated?
The paper is categorized by dozens of different grade designations for purification, sediment removal, component separation, and retention analysis, all depending on the size diameter of the membrane pores. The paper you buy should match the grade specification of the laboratory or industrial application. Designations range from alphabetic codes to numeric codes in double or triple digits.

Is Filtration Paper Available in Bulk?
Filtration paper comes in packs of 25, 50, 100, 500, and 1,000. Each package size also comes in cases or cartons, from leading brands like Whatman™ of GE Health Care Life Sciences and MSI of Midland Scientific, Inc.
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VWR Filter Paper, 4.92", Grade 415, 100/Pack
Item: 1602987 / Model : 28320-100 PK
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  • Product Type: Filter Paper
  • Diameter: 4.92"
  • Material: Borosilicate Glass
26.49 $26.49
100/Pack
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Dyn-A-Med Products Square Glass Fiber Pads, 10/Case (DYN 80081 CS)
Item: 1602471 / Model : DYN 80081 CS
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  • Product Type: Pads
  • Dimensions: 4"L x 4"W
  • Made of glass fiber
449.99 $449.99
10/Case
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LabStrong Corp High Flow Rate Final Filter
Item: 1602163 / Model : FL0016-1 EA
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  • Product Type: Final Filter
  • Made of cellulose
  • Automatic air venting with inlet and variable hose barb outlet
98.99 $98.99
Each
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Pyrex Filtering Flask, 1000 ml
Item: 1606497 / Model : 65340-1L EA
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  • Product Type: Filtering Flask
  • Made of borosilicate glass
  • Protective coating helps prevent glass from shattering, reduces spills and is autoclavable (121 degree C) and resistant to thermal shock
83.99 $83.99
Each
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Ahlstrom Filtration LLC Grade 161 Filter Paper, 100/Pack
Item: SS4128940
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: Microfiber Glass
As low as 16.99 $16.99
Multiple options available
Whatman GE Healthcare Biosciences Grade 50 Filter Paper, 100/Pack
Item: SS4128962
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: High Quality Cotton Linters
As low as 34.59 $34.59
Multiple options available
Whatman GE Healthcare Biosciences Filter Paper, 9.45", Grade 42, 100/Pack
Item: 1604698 / Model : 1442-240 PK
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  • Product type: Filter paper
  • Diameter: 9.45"
  • Material: High-quality cotton linters
199.99 $199.99
100/Pack
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Tisch Scientific Syringe Filter, 100/Pack
Item: 1602073 / Model : SF14455 PK
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  • Product Type: Syringe Filter
  • Made of polyvinylidene fluoride
  • Quantity: 100/Pack
164.19 $164.19
100/Pack
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Whatman GE Healthcare Biosciences Polypropylene Syringe Filter, 1000/Pack
Item: 1605213 / Model : 6790-2504 PK
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  • Product Type: Membrane Syringe Filter
  • Dimensions: 25mm Dia
  • Made of polypropylene
1228.99 $1,228.99
1000/Pack
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IW Tremont Filter Paper, 1.67", 100/Pack
Item: 1603390 / Model : MSI AH4250 PK
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  • Filter Paper
  • 1.67" diameter
  • Borosilicate glass
76.99 $76.99
100/Pack
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Maine Manufacturing Nylon Syringe Filter, 500/Pack
Item: 1603401 / Model : 1224106 PK
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  • Made of nylon
  • Quantity: 500/Pack
  • High dirt load capacity
1199.99 $1,199.99
500/Pack
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Nalge Nunc International Corp Burette Filler Kit
Item: 1605072 / Model : 3645-2550 PK
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  • Filler kit
  • Made of LDPE
  • Automatic-filling and self-zeroing burette
42.69 $42.69
Each
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IW Tremont Filter Paper, 5.9", 100/Pack
Item: 1603384 / Model : MSI CFP4-150 PK
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  • Product Type: Filter Paper
  • Diameter: 5.9"
  • Material: Cellulose
51.99 $51.99
100/Pack
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Ahlstrom Filtration LLC Grade 151 Filter Paper, 100/Pack
Item: SS4128939
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: Microfiber Glass
As low as 39.99 $39.99
Multiple options available
IW Tremont Filter Paper, Grade E, 1.67", 100/Pack
Item: 1603383 / Model : MSI E4250 PK
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  • Product Type: Filter paper
  • Diameter: 1.67"
  • Material: Microfiber glass
44.59 $44.59
100/Pack
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Whatman GE Healthcare Biosciences Mini UniPrep Syringeless Filter, 25/Pack
Item: 1605412 / Model : UN503NPUORG PK
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  • Product Type: Syringeless filter
  • Made of polytetrafluoroethylene
  • Capacity: 0.4 ml
1969.99 $1,969.99
25/Pack
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Whatman GE Healthcare Biosciences Syringe Filter, 1500/Case
Item: 1604862 / Model : 6871-2502 CS
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  • Dimensions: 25mm Dia
  • Made of nylon
  • Quantity: 1500/Case
2478.39 $2,478.39
1500/Case
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Whatman GE Healthcare Biosciences Grade 54 Filter Paper, 100/Case
Item: SS4128963
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: High Quality Cotton Linters
As low as 37.89 $37.89
Multiple options available
Whatman GE Healthcare Biosciences Grade 2V Filter Paper, 100/Pack
Item: SS4128956
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: Cellulose
As low as 75.59 $75.59
Multiple options available
Ahlstrom Filtration LLC Grade 613 Filter Paper, 100/Pack
Item: SS4128944
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: Cellulose and Linter Fibers
As low as 9.99 $9.99
Multiple options available
Nalge Nunc International Corp Polysulfone Filter Holder
Item: SS4084712
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  • Product Type: Filter Holder
  • Capacity: 250 ml
  • Made of polysulfone
As low as 106.99 $106.99
Multiple options available
Ahlstrom Filtration LLC Filter Paper, 1.67", Grade 74, 100/Pack
Item: 1604830 / Model : 0740-0425 PK
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  • Product Type: Filter Paper
  • Diameter: 1.67"
  • Material: High Quality Cotton Linters
32.39 $32.39
100/Pack
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Whatman GE Healthcare Biosciences Grade 1 Filter Paper, 100/Pack
Item: SS4128951
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  • Product Type: Filter Paper
  • Available in different sizes
  • Material: Cellulose
As low as 9.49 $9.49
Multiple options available
IW Tremont Filter Paper, 0.83", 100/Pack
Item: 1603393 / Model : MSI AH2100 PK
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  • Product Type: Filter Paper
  • Diameter: 0.83"
  • Material: Borosilicate Glass
23.99 $23.99
100/Pack
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