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 : ⌀ 185 mm
thickness : 140 μm
weight : 86 g/m²
ash : 0.1%
qty : 50 discsPRE-FOLDED
These 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 & SIZE
See the cross-reference table and size diagrams in the photos to choose the appropriate reference and diameter of your circles.