Cytiva Whatman™ Qualitative Filter Paper: Grade 4 Circles

Filters and retains coarse particles for monitoring air pollution. Whatman™ Qualitative Filter Paper: Grade 4 Circles are used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

Product Code	Brand	Diameter (Metric)
11370444	Cytiva 1004-027	27 mm
12375813	Cytiva 1004-041	41 mm
11342845	Cytiva 1004-042	42.5 mm
11390444	Cytiva 1004-047	47 mm
11300454	Cytiva 1004-050	50 mm
11352845	Cytiva 1004-055	55 mm
10598671	Cytiva 1004-070	70 mm
11372845	Cytiva 1004-090	90 mm
11382845	Cytiva 1004-110	110 mm
11392845	Cytiva 1004-125	125 mm
10614941	Cytiva 1004-150	150 mm
10419691	Cytiva 1004-185	185 mm
11322855	Cytiva 1004-240	240 mm
11360444	Cytiva 1004-270	270 mm
11332855	Cytiva 1004-320	320 mm
11380444	Cytiva 1004-400	400 mm

Description

Filters and retains coarse particles for monitoring air pollution. Whatman™ Qualitative Filter Paper: Grade 4 Circles are used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

 

These cellulose filters are used in qualitative analytical techniques to determine and identify materials and for clarifying liquids. 

• Particle Retention: 25μm
• Porosity: Coarse
• Filtration speed: Herzberg, 37 sec.
• Surface: smooth
• Extremely fast filtering  with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
• Useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis

Specifications

• Format: Disc
• Particle Retention: 25 μm
• Filtration Speed: 37 sec.
• Grade: Grade 4
• Thickness (Metric): 210 μm

• Material: Cellulose
• Pore Size: 20 to 25 μm
• Flow Rate: Fast
• Porosity: Medium