Whatman™ FKS11392845 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.

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:

• Description: Grade 4 Qualitative Filter Paper Standard Grade, circle, 125 mm
• Format: Disc
• Material: Cellulose
• Particle Retention: 25 μm
• Pore Size: 20 to 25 μm
• Filtration Speed: 37 sec.
• Flow Rate: Fast
• For Use With (Application): A standard grade filter used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
• Grade: Grade 4
• Porosity: Medium
• Quantity: 100 Pk.
• Thickness (Metric): 210 μm
• Type: Qualitative Filter Paper
• Diameter (English): 4.92 in.
• Diameter (Metric): 125 mm
• Unit Size: Pack

Note: Picture is for illustration only. The actual product might be different