Ahlstrom 8613-2050 Black Filter Paper, Grade 8613, 205 mm, 100/pk

Ahlstrom Grade 8613 is a specialty black filter paper designed for visual examination of particles in a variety of laboratory filtration and analysis tasks. Its dark surface makes it easier to see and evaluate precipitates or particulates trapped on the surface during filtration.

This product features 205 mm diameter circles with a pore size around 4 µm and a Herzberg filtration speed of about 118 seconds per 100 mL, providing a balance of filtration throughput and particle retention for general lab use.

The black finish on Grade 8613 paper makes contrasting particles and solids easier to observe after filtration. This visual advantage is particularly useful in qualitative analyses where identifying or counting retained substances is important.

Yes — Grade 8613 is classified as qualitative filter paper, meaning it’s designed for general laboratory separations and qualitative analysis of samples, including liquid clarification and particulate detection.

This product comes as a pack of 100 filter circles, each with a 205 mm diameter, making it suitable for larger funnel setups or high-volume filtrations commonly used in environmental, food, and industrial lab applications.