Qualitative Filter Paper 12.5cm Lab Filter Paper for Chemistry, Standard Qualitative Grade 4-Fast Flow 125mm(100 Discs)

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.