Grade 540 Ashless General Lab Filter Paper

GE’s Whatman Grade 540 is a high-purity, acid-treated cellulose lab filter paper. Mechanically strong Grade 540 is well suited for quantitative or gravimetric analysis of strongly acidic or alkaline samples.

• Acid-treated for high wet-strength
• Extremely low ash content (0.006% ash maximum)
• Nominal particle retention of 8 µm
• Medium flow rate (Herzberg filtration speed 200 s)
• High chemical resistance to strong acid and alkali suspensions

Gravimetric analysis of acid and alkali suspensions

GE’s hardened, ashless Grade 540 lab filter paper is frequently used as a gravimetric filter during analysis of metals in acidic or alkaline solutions and in the collection of hydroxides. The acid-treated surface prevents tearing during filtration and allows the user to scrape precipitates from the paper.

Grade 540: 8 µm

Specifications:

• Grade: Grade 540
• Format: Circles
• Type: Hardened Ashless
• Typical Particle Retention in Liquid: 8 µm
• Typical Water Flow Rate (ml/min) for 9cm diameter: 97
• Nominal Thickness: 160 µm
• Nominal Basis Weight: 85 g/m²
• Nominal Air Flow Rate: 13s/100mL/in²
• Nominal Ash Content: 0.005%
• Material: High-quality cotton linters
• Alpha Cellulose Content Min.: ≥98%
• Typical Trace Element Levels: Aluminium 3.4 µg/g, Antimony <0.5 µg/g, Arsenic <0.5 µg/g, Barium <0.5 µg/g, Boron <1 µg/g, Calcium 14.7 µg/g, Chromium 1.1 µg/g, Copper 8.2 µg/g, Iron 16.3 µg/g, Lead <0.5 µg/g, Magnesium 3.3 µg/g, Manganese <0.5 µg/g, Mercury <0.5 µg/g, Potassium 3.7 µg/g, Silicon <6 µg/g, Sodium 17 µg/g, Zinc 87.8 µg/g

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