GRADE 4 STANDARD Qualitative Filter Paper
Equivalent to Whatman grade 4, 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 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
SPECS
- paper : pure cotton cellulose
- flow : fast
- retention : 20~25 μm (coarse)
- speed : 15~20 s (10ml DIN 53137)
- size : ⌀ 125 mm
- thickness : 140 μm
- weight : 86 g/m²
- ash : 0.1%
- qty : 100 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 as ST004-125q (folding) or ST004-125v (pleating).
EQUIVALENCE & SIZE
See the cross-reference table and size diagrams in the photos to choose the appropriate reference and diameter of your circles.
