Whatman^® Qualitative Filter Paper, Grade 4, Diam. 27 mm, Whatman (CAT#: STEM-L-4598-LC)

The Whatman^® Qualitative Filter Paper, Grade 4 manufactured by Whatman is ideal for retention of coarse particles and gel-like precipitates, or for air pollution monitoring where requiring high flow rate. It features very fast filtration speed.

Material: Cellulose filters, circles
Packaging: Pack of 100
Parameter: 37 sec/100 mL speed (Herzberg), 0.22 psi wet burst
Diam.: 27 mm
Thickness: 205 μm
Ash: ≤0.06%
Pore size: 20-25 μm (Particle retention)
Basis weight: 92 g/m²

Very fast filtration speed

Whatman^® Qualitative Filter Paper, Grade 4, Diam. 185 mm, Whatman (CAT#: STEM-L-4599-LC)