Cytiva® Cellulose Filter Papers, Filter Circles, 63mm Dia

Whatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper. They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.

These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).

Extremely high flow rate

• Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
• Fast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis

Grade 4 Qualitative Filter Papers (20-25 µm particle retention) are available in a variety of sizes and formats including circles, sheets, and rolls. They are also available as prepleated filters, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Specifications:

• Application: Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.
• Grade: Grade 4
• Grade Type: Standard
• Material: Cellulose
• Nominal Ash Content 1: 0.06%
• Nominal air flow rate: 4 s/100 ml/in²
• Nominal basis weight: 92 g/m²
• Nominal thickness: 210 µm
• Typical Particle Retention in Liquid 2: 25 µm
• Typical Trace Element Levels: Aluminium 3.6 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead <0.5 µg/g Magnesium 21 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 6.2 µg/g Silicon 8.8 µg/g Sodium 32.3 µg/g Zinc 58.3 µg/g
• Typical water flow rate 3: 247 ml/min
• Format: Roll
• Dimensions: 38 x 114 mm