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GRADE 4 Q QUADRANT Qualitative Filter Paper
Equivalent to Whatman grade 4 FF, this very fast laboratory filter paper is used for coarse filtration when you need to separate a solid or precipitate from the filtrate.
Made from high alpha-cellulose cotton, this standard lab filter is not intended for ashing.
APPLICATIONS
- science : Routine clean-up of insoluble liquids such as biological fluids or organic extracts in labs
- food : Determination Sodium Chloride in foodstuffs
- beverage : Filtration of musts in wine
- metalurgy : Determination of silicon impurities in pig iron and steel
- environment : Fast flowing air and exhausts monitoring when the collection of fine particles is not critical.
COARSE RETENTION
Retains coarse particles and gelatinous precipitates like:- Metal hydroxides (Al, Cr, Fe, Mg) , Be Oxide
- Insoluble iron and ore, precipitated Silicates
- Culture media, and colloidal sediments
- paper : pure cotton cellulose
- flow : fast
- retention : 20~25 μm (coarse)
- speed : 15~20 s (10ml DIN 53137)
- size : ⌀ 150 mm
- thickness : 140 μm
- weight : 86 g/m²
- ash : 0.1%
- qty : 50 discs
PRE-FOLDED
These Quadrant Folded Filters saves folding time when filtration is done repetitively.
Use our pleating equivalent ST004-150v for even faster filtration.
Suitable for gravity filtration in standard funnels, not vacuum.EQUIVALENCE & SIZE
See the cross-reference table and size diagrams in the photos to choose the appropriate reference and diameter of your circles.
Carlos T.
2025-08-16 14:47:17
Fits perfect on the 75 mm glass funnel. Came well packed with Styrofoam cutouts.
John E. Miller
2024-12-15 15:23:14
It performed as I expected and was just what I needed!!
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