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18.5 cm Lab Filter Paper, Standard Grades 1, 2, 4 - ZENPORE Fast, Medium, Slow Flow 185 mm (Bundle of 3 x 100 Discs)
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About the item
GRADE 1, 2, 4 STANDARD Qualitative Filter Paper
Equivalent to Whatman grade 1, 2, 4, these laboratory filter paper are used for a broad range of filtration when you need to separate a solid or precipitate from the filtrate.
Made from high alpha-cellulose cotton, these standard lab filter are not intended for ashing.
APPLICATIONS
Depending on the grades, these filters have many applications, for example:
- science : From clean-up of insoluble liquids to routine clarification of suspension
- food : From solid foodstuffs separation and liquid extraction to content determination
- beverage : From filtration of musts, pulps and s to malt analysis
- agriculture : From soil pre-filtration to analysis
- environment : From monitoring of fast flowing exhausts to smoke
COARSE TO HIGH RETENTION
Retains fine, medium and coarse precipitates depending on grade used, for example:
- Grade 1 : Metal Sules (Pb, coarse form of Ba and Ca)
- Grade 2 : Metal Sulfides (Cd, Ni, Zn, Fe, Pb, Mn, Ag, As)
- Grade 4 : Metal hydroxides (Al, Cr, Fe, Mg) , Be Oxide
SPECS
- paper : pure cotton cellulose
- flow : slow, medium, fast
- retention : 5~10, 10~15, 20~25 μm (fine, medium, coarse)
- speed : 15~20 s (10ml DIN 53137)
- size : ⌀ 185 mm
- thickness : 140-160 μm
- weight : 86 g/m²
- ash : 0.1%
- qty : 300 discs
PLAIN-DISCS
Those Flat Discs are suitable for gravity and Buchner low suction vacuum filtration.
The same affordable filters are also available funnel-ready prefolded or prepleated.
EQUIVALENCE & SIZE
See the cross-reference table and size diagrams in the photos to choose the appropriate reference and diameter of your circles.
- GRADES 1, 2, 4 : 18.5cm - Equivalent to Whatman Top 3 standard qualitative grades (185mm).
- GRADE 1 : MEDIUM RETENTION / MEDIUM FLOW - Retains medium crystalline particles (10~15 micron).
- GRADE 2 : HIGH RETENTION / SLOW FLOW - Retains fine crystalline particles (5~10 micron).
- GRADE 4 : COARSE RETENTION / FAST FLOW - Retains coarse and gelatinous precipitates (20~25 micron).
- BROAD APPLICATION RANGE : lab & chemistry, food & agriculture, brewing & wine, air & filtration.
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