Grade 540

Whatman Grade 540 is a high-purity, acid-treated cellulose filter paper designed for laboratory use. It is mechanically strong and ideal for quantitative or gravimetric analysis, particularly when dealing with strongly acidic or alkaline samples.

Key Features:

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

Applications:

Grade 540 is frequently used for gravimetric analysis of metal content in acidic or alkaline solutions and for collecting hydroxides. The acid-treated surface ensures that the paper remains intact during filtration and allows for easy scraping of precipitates.