9 cm Lab Filter Paper, Standard Qualitative Grade 4 - ZENPORE Fast Flow 90 mm (100 Discs)

Description

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.APPLICATIONSscience : Routine clean-up of insoluble liquids such as biological fluids or organic extracts in labsfood : Determination Sodium Chloride in foodstuffsbeverage : Filtration of musts in winemetalurgy : Determination of silicon impurities in pig iron and steelenvironment : 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 OxideInsoluble iron and ore, precipitated SilicatesCulture media, and colloidal sedimentspaper : pure cotton celluloseflow : fastretention : 20~25 μm (coarse)speed : 15~20 s (10ml DIN 53137)size : ⌀ 90 mmthickness : 140 μmweight : 86 g/m²ash : 0.1%qty : 100 discsPLAIN-DISCSThese Flat Discs are suitable for gravity and Buchner low suction vacuum filtration.The same affordable filters are also available funnel-ready as ST004-90q (folding) or ST004-90v (pleating).EQUIVALENCE & SIZESee the cross-reference table and size diagrams in the photos to choose the appropriate reference and diameter of your circles.