Ahlstrom 9090-0550 Qualitative Filter Paper Wet-Strengthened, Grade 909, 55 mm, 100/pk

This filter paper is designed for routine qualitative filtration and sample clarification in laboratory and industrial applications. It is commonly used in food testing, environmental analysis, and general liquid filtration workflows.

Wet-strengthened filter paper contains a chemically stable resin that reinforces the paper when wet, allowing it to withstand vacuum or pressure filtration without tearing. This makes it suitable for more demanding filtration processes.

Grade 909 offers approximately 3 µm particle retention with a medium flow rate, providing a balance between filtration speed and retention. It is considered a tighter and more retentive version of coarser grades.

The filter is made from high-purity cellulose fibers, ensuring consistent performance, low contamination, and reliable results in analytical applications.

Grade 909 provides strong wet durability, good particle retention, and compatibility with vacuum systems, making it a versatile choice for labs needing a durable, mid-retention filter for routine testing.