WHATMAN Grade 4 Qualitative Filter Paper

CYTIVA

A standard grade filter used in qualitative analytical techniques to determine and identify materials. Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis. Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

• Typical Properties

Description	Medium flow, thick
Particle Retention in Liquid (μm)	20-25
Filtration Speed (approx) Herzberg (s)	37
Air Flow (s/100 ml/in²)	3.7
Typical Thickness (μm)	205
Basis Weight (g/m2)	96

• Ordering Information

Diameter (mm)	Catalog Number	Quantity/Pack
27	1004-027	400
41	1004-041	100
42.5	1004-042	100
47	1004-047	100
50	1004-050	100
55	1004-055	100
70	1004-070	100
90	1004-090	100
110	1004-110	100
125	1004-125	100
150	1004-150	100
185	1004-185	100
240	1004-240	100
270	1004-270	100
320	1004-320	100
400	1004-400	100
460 × 570	1004-917	100
580 x 580	1004-930	100

WHATMAN Grade 4 Qualitative Filter Paper

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