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.

Features Of Product

 

 

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.

α-cellulose?

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.

Applications

 

 

  • 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

 

Selecting The Right Paper

 

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.

 

       Grade

 

  NO.20 ( 5~8㎛ )  NO.10 ( 6~10㎛ )
  • Medium filtration speed
  • Widely used for qualitative analysis which

requires preciseness as it filters precipitates well

  • 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
FEATURES
  • General qualitative analysis,

General physico-chemical experiments

  • Determining fractional crystallization

and filtration of nickel, sulfide and lead dioxide

  • Sulfur analysis

(coal, cork, charcoal, etc)

  • Dyeing test, filtration of viscous solutions such

          as oil and juice and scientific experiments

APPLICATION
  NO.200 ( 2~3㎛ )  NO.2 ( 5~8㎛ )
  • Surface hardened filter paper,

the slowest filtration speed

  • Generally used to analyze fine particles

mixed in a large amount of liquid

  • 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
pressure.

FEATURES
  • Filtration of fine particles such as barium sulfate,

metastannic acid, cuprous oxide, etc

  • General qualitative analysis,

General physico-chemical experiments

  • Medicinal analysis, liquid culture medium,

antibiotic field

  • Ink, food coloring, plating solution
APPLICATION
  NO.21 ( 8~12㎛ )  NO.100 ( 3~5㎛ )
  • Suitable for filtration of coarse precipitates

such as lead sulfide, iron sulfide and
silver sulfide etc

  • 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

FEATURES
  • Measurement for alkali carbonates
  • Available for beer or malt analysis
  • Filtration of fine particle such as nickel sulfide,

lead dioxide, calcium fluoride, zinc sulfide etc

APPLICATION
  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
FEATURES
  • Filtration of iron hydroxide, plating solutions and food coloring
APPLICATION

 

 

  • 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.

 

         Properties

 

Ash Contents
( % )
Retention Rate
( ㎛ )
Filtration Speed
( s / 100ml )
Thickness
( mm )
Basic weight
( g / ㎡ )
Grade
6~10220.1770No.10
0.15~8270.2085No.20
5~8300.26130No.2
0.12~31800.1684No.200
0.13~51000.1684No.100
0.18~12200.2084No.21
0.112~15100.2184No.22

 

 

  • 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℃.
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