WHATMAN Grade 41 Quantitative Filter Paper, Ashless

Cytiva

The fastest ashless filter paper, recommended for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides). Also used in quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates. The 47 mm Grade 41 filter can be easily removed for further analysis or culturing.

• Typical Properties

Description	Fast
Particle Retention in Liquid (μm)	20
Filtration Speed (approx) Herzberg (s)	-
Normal ash content (%)	0.007
Typical Thickness (μm)	215
Basis Weight (g/m2)	85
Typical water flow rate (ml/min)²	254
Nominal air flow rate (s/100 mL/in2)	4

• Ordering Information – Qualitative Filter Circles

Diameter (mm)	Catalog Number	Quantity/Pack
42.5	1441-042	100
47	1441-047	100
50	1441-050	100
55	1441-055	100
60	1441-060	100
70	1441-070	100
90	1441-090	100
110	1441-110	100
125	1441-125	100
150	1441-150	100
185	1441-185	100
240	1441-240	100
320	1441-320	100
203 × 254	1441-886	100
460 x 570	1441-917	100

WHATMAN Grade 41 Quantitative Filter Paper, Ashless

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