Grade 40

Whatman Grade 40 high-purity filters are widely used for quantitative analysis due to their general-purpose nature. They are made from high-purity materials, ensuring a minimal ash content of 0.007% maximum, making them particularly suitable for analytical applications where low contamination is essential.

Key Features:

High-Purity: Contains a maximum of 0.007% ash, ensuring minimal contamination.
Medium Particle Retention: Nominal particle retention rating of 8 µm, suitable for capturing medium-sized particles.
Filtration Speed: Moderate filtration speed with a Herzberg value of 340 seconds, balancing efficiency and thoroughness.
Applications: These filters are especially useful in gravimetric analysis, where precise measurement of masses is critical after filtration. Their properties make them adaptable to a variety of analytical filtration tasks, including the separation of fine precipitates.

Overall, Whatman Grade 40 filters are versatile and reliable for quantitative analytical work, providing consistency in filtering performance.