Cytiva Whatman™ Quantitative Filter Paper: Grade 540 Circles

Description

Use as a gravimetric filter during analysis of metals in acidic or alkaline solutions and in the collection of hydroxides. Whatman™ Quantitative Filter Paper: Grade 540 Circles acid-treated surface prevents tearing during filtration and allows the user to scrape precipitates from the paper.

Whatman hardened ashless quantitative filter papers are acid-hardened to give high wet strength and chemical resistance with extremely low ash content. They are suitable for a wide range of critical filtration procedures.

• High-purity, acid-treated cellulose lab filter paper
• Mechanically strong 
• Well suited for quantitative or gravimetric analysis of strongly acidic or alkaline samples
• Extremely low ash content (0.006% ash maximum)
• Nominal particle retention of 8 μm
• Medium flow rate (Herzberg filtration speed 200 s)

Specifications

• Airflow Rate: 13 s/100 mL/in²
• Description: Grade 540 Ashless General Lab Filter Paper, 21 mm circles (100 pcs)
• Filter Type: Hardened Ashless
• Format: Disc
• Material: Cotton Linters
• Particle Retention: 8 μm
• Filtration Speed: ASTM, 55 seconds; Herzberg, 200 seconds
• For Use With (Application): Frequently used in the gravimetric analysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis.
• Grade: Grade 540
• Porosity: Medium
• Quantity: 100/Pk.
• Thickness (Metric): 160 μm
• Type: Quantitative Filter Paper
• Diameter (Metric): 21 mm