18.5 cm Quadrant-Folded Filter Paper, Pre-Folded disks, Qualitative Grade 4 - ZENPORE Fast Flow 185 mm (50 Discs)

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About 18.5 Cm Quadrant-Folded Filter Paper, Pre-Folded

GRADE 4 Q QUADRANT Qualitative Filter PaperEquivalent 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 wine : Filtration of musts 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 RETENTIONRetains 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 SPECS paper : pure cotton cellulose flow : fast retention : 20~25 μm (coarse) speed : 15~20 s (10ml DIN 53137) size : ⌀ 185 mm thickness : 140 μm weight : 86 g/m² ash : 0.1% qty : 50 discs PRE-FOLDEDThose Quadrant Folded Filters saves folding time when filtration is done repetitively.Use our pleating equivalent ST004-185v for even faster filtration.Suitable for gravity filtration in standard funnels, not vacuum. EQUIVALENCE & SIZESee the cross-reference table and size diagrams in the photos to choose the appropriate reference and diameter of your circles.