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.
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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. |
 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)
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Low-cost filter papers for scientific experiments by students are available. |
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NO.10 ( 6~10㎛ ) |
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NO.20 ( 5~8㎛ ) |
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FEATURES |
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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 |
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Medium filtration speed
Widely used for qualitative analysis which
requires preciseness as it filters precipitates well |
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APPLICATION |
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Dyeing test, filtration of viscous solutions such
as oil and juice and scientific experiments |
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General qualitative analysis,
General physico-chemical experiments
Determining fractional crystallization
and filtration of nickel, sulfide and lead dioxide
Sulfur analysis
(coal, cork, charcoal, etc) |
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NO.2 ( 5~8㎛ ) |
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NO.200 ( 2~3㎛ ) |
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FEATURES |
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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. |
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Surface hardened filter paper,
the slowest filtration speed
Generally used to analyze fine particles
mixed in a large amount of liquid |
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APPLICATION |
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General qualitative analysis,
General physico-chemical experiments
Medicinal analysis, liquid culture medium,
antibiotic field
Ink, food coloring, plating solution |
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Filtration of fine particles such as barium sulfate,
metastannic acid, cuprous oxide, etc |
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NO.100 ( 3~5㎛ ) |
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NO.21 ( 8~12㎛ ) |
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FEATURES |
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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 |
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Suitable for filtration of coarse precipitates
such as lead sulfide, iron sulfide and
silver sulfide etc |
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APPLICATION |
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Filtration of fine particle such as nickel sulfide,
lead dioxide, calcium fluoride, zinc sulfide etc |
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Measurement for alkali carbonates
Available for beer or malt analysis |
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NO.22 ( 12~15㎛ ) |
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FEATURES |
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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 |
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APPLICATION |
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Filtration of iron hydroxide, plating solutions and food coloring |
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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. |
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Grade |
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Basic weight
( g / ㎡ ) |
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Thickness
( mm ) |
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Filtration Speed
( s / 100ml ) |
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Retention Rate
( ㎛ ) |
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Ash Contents
( % ) |
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No.10 |
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70 |
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0.17 |
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22 |
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6~10 |
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- |
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No.20 |
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85 |
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0.20 |
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27 |
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5~8 |
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0.1 |
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No.2 |
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130 |
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0.26 |
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30 |
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5~8 |
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- |
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No.200 |
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84 |
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0.16 |
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180 |
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2~3 |
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0.1 |
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No.100 |
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84 |
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0.16 |
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100 |
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3~5 |
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0.1 |
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No.21 |
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84 |
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0.20 |
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20 |
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8~12 |
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0.1 |
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No.22 |
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84 |
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0.21 |
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10 |
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12~15 |
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0.1 |
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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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Grade(mm) |
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Ø 55 |
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Ø 70 |
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Ø 90 |
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Ø 110 |
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Ø 125 |
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No.10 |
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HM.01006055 |
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HM.01006070 |
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HM.01006090 |
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HM.01006110 |
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HM.01006125 |
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No.20 |
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HM.02005055 |
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HM.02005070 |
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HM.02005090 |
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HM.02005110 |
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HM.02005125 |
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No.2 |
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HM.00205055 |
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HM.00205070 |
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HM.00205090 |
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HM.00205110 |
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HM.00205125 |
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No.200 |
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HM.20002055 |
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HM.20002070 |
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HM.20002090 |
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HM.20002110 |
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HM.20002125 |
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No.100 |
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HM.10003055 |
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HM.10003070 |
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HM.10003090 |
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HM.10003110 |
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HM.10003125 |
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No.21 |
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HM.02110055 |
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HM.02110070 |
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HM.02110090 |
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HM.02110110 |
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HM.02110125 |
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No.22 |
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HM.02212055 |
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HM.02212070 |
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HM.02212090 |
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HM.02212110 |
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HM.02212125 |
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Grade(mm) |
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Ø 150 |
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Ø 185 |
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Ø 200 |
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Ø 240 |
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Ø 250 |
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No.10 |
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HM.01006150 |
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HM.01006185 |
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HM.01006200 |
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HM.01006240 |
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HM.01006250 |
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No.20 |
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HM.02005150 |
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HM.02005185 |
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HM.02005200 |
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HM.02005240 |
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HM.02005250 |
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No.2 |
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HM.00205150 |
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HM.00205185 |
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HM.00205200 |
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HM.00205240 |
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HM.00205250 |
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No.200 |
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HM.20002150 |
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HM.20002185 |
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HM.20002200 |
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HM.20002240 |
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HM.20002250 |
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No.100 |
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HM.10003150 |
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HM.10003185 |
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HM.10003200 |
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HM.10003240 |
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HM.10003250 |
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No.21 |
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HM.02110150 |
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HM.02110185 |
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HM.02110200 |
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HM.02110240 |
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HM.02110250 |
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No.22 |
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HM.02212150 |
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HM.02212185 |
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HM.02212200 |
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HM.02212240 |
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HM.02212250 |
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Grade(mm) |
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Ø 285 |
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Ø 300 |
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Ø 350 |
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Ø 380 |
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Ø 400 |
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No.10 |
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HM.01006285 |
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HM.01006300 |
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HM.01006350 |
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HM.01006380 |
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HM.0100640 |
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No.20 |
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HM.02005285 |
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HM.02005300 |
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HM.02005350 |
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HM.02005380 |
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HM.02005400 |
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No.2 |
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HM.00205285 |
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HM.00205300 |
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HM.00205350 |
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HM.00205380 |
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HM.00205400 |
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No.200 |
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HM.20002285 |
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HM.20002300 |
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HM.20002350 |
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HM.20002380 |
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HM.20002400 |
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No.100 |
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HM.10003285 |
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HM.10003300 |
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HM.10003350 |
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HM.10003380 |
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HM.10003400 |
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No.21 |
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HM.02110285 |
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HM.02110300 |
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HM.02110350 |
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HM.02110380 |
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HM.02110400 |
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No.22 |
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HM.02212285 |
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HM.02212300 |
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HM.02212350 |
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HM.02212380 |
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HM.02212400 |
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Grade(mm) |
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Ø 450 |
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Ø 500 |
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Ø 550 |
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Ø 600 |
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