Whatman^® Quantitative Filter Paper, Hardened Low-Ash, Grade 540, Diam. 21 mm, Whatman (CAT#: STEM-L-4449-LC)

The Whatman^® Quantitative Filter Paper, Hardened Low-Ash, Grade 540 manufactured by Whatman features hard surface and excellent resistance to strong acid and alkali, making it ideal ideal for gravimetric analysis of metals in acid or alkali solutions and collection of hydroxides after precipitation with strong alkalis.

Material: Cotton filters, circles
Packaging: Pack of 100
Parameter: 200 sec/100 mL speed (Herzberg), 7 psi wet burst
Diam.: 21 mm
Thickness: 160 μm
Ash: ≤0.006%
Pore size: 8 μm (Particle retention)
Basis weight: 85 g/m²

Medium retention and flow rate
Excellent chemical resistance against strong acid and alkali

Whatman^® Quantitative Filter Paper, Hardened Low-Ash, Grade 540, Diam. 110 mm, Whatman (CAT#: STEM-L-4450-LC)