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FILTERFILTER PAPERQualitative Filter Paper


Qualitative filter papers are originally used to detect materials which exist in analysis samples.
However, as they can be produced at a reasonable price and in various sizes, they are used for a variety of purposes from laboratories to production sites.

Hyundai Micro’s qualitative filter papers consist of nearly 100% alpha-cellulose and have less than 0.1% of ash contents.
Characterized by their slim shapes. Enhanced wet burst strength They are available in any size you need as well as in standard sizes. We maintain the highest quality in accordance with ISO 9001:2008.
Alpha-cellulose is a main ingredient of pulp which is raw material for paper. It is divided into three types: α, β, and γ. Among these, α-cellulose is not soluble in solutions with 17~18% sodium hydroxide.
It has a high degree of polymerization and it is pure cellulose. Beta-cellulose is the soluble fraction which is reprecipitated on acidification of the solution; gamma-cellulose is that fraction remaining in the solution.

Liquids purification in qualitative analysis
Filtration of precipitate such as calcium hydroxide, lead sulfide and calcium carbonate
Seed testing and Soil analysis
Detection and measurement of dust and gas
Filtration of buffer solutions and dye

The selection of a laboratory filter depends on the conditions and objectives of the experiment or analytical procedure. The three most important characteristics of any laboratory filter are:

① Determine the precision of filtration
② Characters of liquids for filtration (pH, temperature, viscosity)
③ Examine carefully conditions of particles to be sampled
(particle diameter, particle concentration)
Low-cost filter papers for scientific experiments by students are available.

    NO.10 ( 6~10㎛ )   NO.20 ( 5~8㎛ )
  Relatively fast filtration speed
  Used for diverse purposes such as filtration of
     viscous solutions and bacterial culture medium
  Widely used for clarifying filtration and Analysis
  Medium filtration speed
  Widely used for qualitative analysis which
     requires preciseness as it filters precipitates well
  Dyeing test, filtration of viscous solutions such
     as oil and juice and scientific experiments
  General qualitative analysis,
     General physico-chemical experiments
  Determining fractional crystallization
     and filtration of nickel, sulfide and lead dioxide
  Sulfur analysis
      (coal, cork, charcoal, etc)
    NO.2 ( 5~8㎛ )   NO.200 ( 2~3㎛ )
  The thickest qualitative filters
  Same filtration performance as other companies'
     item No.2, Due to its strong burst strength,
     it performs consistent filtration under strong
  Surface hardened filter paper,
     the slowest filtration speed
  Generally used to analyze fine particles
     mixed in a large amount of liquid
  General qualitative analysis,
     General physico-chemical experiments
  Medicinal analysis, liquid culture medium,
     antibiotic field
  Ink, food coloring, plating solution
  Filtration of fine particles such as barium sulfate,
      metastannic acid, cuprous oxide, etc
    NO.100 ( 3~5㎛ )   NO.21 ( 8~12㎛ )
  Surface hardened filter paper, slow filtration
     speed, used for relatively precise filtration
  More suitable for fine precipitate filtration than
     N0.20, Available for pressure filtration
  Suitable for filtration of coarse precipitates
     such as lead sulfide, iron sulfide and
     silver sulfide etc
  Filtration of fine particle such as nickel sulfide,
     lead dioxide, calcium fluoride, zinc sulfide etc
  Measurement for alkali carbonates
  Available for beer or malt analysis
    NO.22 ( 12~15㎛ )
  The fastest filtration speed
  Used to filter coarse particles such as iron hydroxide,
     aluminum hydroxide and chromium hydroxide
  Used to analyze silicon in steel and pig iron
  Filtration of iron hydroxide, plating solutions and food coloring
The pore sizes are indicated in accordance with the test methods selected by each filter paper manufacturer.
   Thus, filtration performance may be the same even though pore sizes are different with those of others manufacturers.

Grade Basic weight
( g / ㎡ )
( mm )
Filtration Speed
( s / 100ml )
Retention Rate
( ㎛ )
Ash Contents
( % )
No.10 70 0.17 22 6~10 -
No.20 85 0.20 27 5~8 0.1
No.2 130 0.26 30 5~8 -
No.200 84 0.16 180 2~3 0.1
No.100 84 0.16 100 3~5 0.1
No.21 84 0.20 20 8~12 0.1
No.22 84 0.21 10 12~15 0.1
Basic weight ( g / ㎡ ) : In accordance with DIN EN ISO 536, a test is performed with filter papers from 500㎠ to 1,000㎠
Thickness ( mm ) : In accordance with DIN EN ISO 534, the value measured with a thickness measurer under pressure
   of 10N / ㎠
Filtration speed (s / 10ml ) : Fold a filter paper with a diameter of 110m in quarter and soak it.
   Then, hang it and filter 10 ml of distilled water at 20 °C. Time that it takes for filtration is measured.
Retention rate ( ㎛ ) : Retention rate is calculated by test methods of filter paper manufactures. As each manufacturer has a
   different test method, use these data for reference only.
Ash Contents ( % ) : Weight of residues after 10g of filter paper is ignited in platinum crucible at 800℃.

Grade(mm) Ø 55 Ø 70 Ø 90 Ø 110 Ø 125
No.10 HM.01006055 HM.01006070 HM.01006090 HM.01006110 HM.01006125
No.20 HM.02005055 HM.02005070 HM.02005090 HM.02005110 HM.02005125
No.2 HM.00205055 HM.00205070 HM.00205090 HM.00205110 HM.00205125
No.200 HM.20002055 HM.20002070 HM.20002090 HM.20002110 HM.20002125
No.100 HM.10003055 HM.10003070 HM.10003090 HM.10003110 HM.10003125
No.21 HM.02110055 HM.02110070 HM.02110090 HM.02110110 HM.02110125
No.22 HM.02212055 HM.02212070 HM.02212090 HM.02212110 HM.02212125
(Unit: 100 sheets/pack)  

Grade(mm) Ø 150 Ø 185 Ø 200 Ø 240 Ø 250
No.10 HM.01006150 HM.01006185 HM.01006200 HM.01006240 HM.01006250
No.20 HM.02005150 HM.02005185 HM.02005200 HM.02005240 HM.02005250
No.2 HM.00205150 HM.00205185 HM.00205200 HM.00205240 HM.00205250
No.200 HM.20002150 HM.20002185 HM.20002200 HM.20002240 HM.20002250
No.100 HM.10003150 HM.10003185 HM.10003200 HM.10003240 HM.10003250
No.21 HM.02110150 HM.02110185 HM.02110200 HM.02110240 HM.02110250
No.22 HM.02212150 HM.02212185 HM.02212200 HM.02212240 HM.02212250
(Unit: 100 sheets/pack)  

Grade(mm) Ø 285 Ø 300 Ø 350 Ø 380 Ø 400
No.10 HM.01006285 HM.01006300 HM.01006350 HM.01006380 HM.0100640
No.20 HM.02005285 HM.02005300 HM.02005350 HM.02005380 HM.02005400
No.2 HM.00205285 HM.00205300 HM.00205350 HM.00205380 HM.00205400
No.200 HM.20002285 HM.20002300 HM.20002350 HM.20002380 HM.20002400
No.100 HM.10003285 HM.10003300 HM.10003350 HM.10003380 HM.10003400
No.21 HM.02110285 HM.02110300 HM.02110350 HM.02110380 HM.02110400
No.22 HM.02212285 HM.02212300 HM.02212350 HM.02212380 HM.02212400
(Unit: 100 sheets/pack)  

Grade(mm) Ø 450 Ø 500 Ø 550 Ø 600 Ø 600×600
No.10 HM.01006450 HM.01006500 HM.01006550 HM.01006600 HM.01006600A
No.20 HM.02005450 HM.02005500 HM.02005550 HM.02005600 HM.02005600A
No.2 HM.00205450 HM.00205500 HM.00205550 HM.00205600 HM.00205600A
No.200 HM.20002450 HM.20002500 HM.20002550 HM.20002600 HM.20002600A
No.100 HM.10003450 HM.10003500 HM.10003550 HM.10003600 HM.10003600A
No.21 HM.02110450 HM.02110500 HM.02110550 HM.02110600 HM.02110600A
No.22 HM.02212450 HM.02212500 HM.02212550 HM.02212600 HM.02212600A
(Unit: 100 sheets/pack)  
Qualitative filter paper is available in a roll type as well as a sheet type.
For special sizes which are not mentioned in the above, feel free to contact us.

No.10 No.1 No.1
No.2 / No.20 No.2 No.2 / No.232
No.200 - -
No.100 No.6 No.3
No.21 - -
No.22 No.4 -
No.50 No.41 / No.54 / No.541 -
No.51 No.40 / No.43 No.5A
No.52 No.44 No.5B
No.53 No.42 No.5C
No.30 No.52 / No.540 No.3
No.60 No.42 / No.50 / No.542 No.6 / No.4A
The table above is to help you decide which filter paper is suitable for you to use, since it can be vary on its performances
   depending on the manufacturers.