Ahlstrom 1211-4857 Glass Microfiber Filter Paper, Grade 121, 480 x 570 mm, 25/pk

Grade 121 glass microfiber filters are designed for high-efficiency filtration of fine particles, commonly used in environmental testing, water analysis, and laboratory sample preparation. They are especially effective for clarifying liquids with heavy particulate loads.

This filter offers approximately 1.0 µm particle retention, making it suitable for capturing fine particles while maintaining a relatively fast filtration rate.

Glass microfiber filters are binder-free, chemically inert, and capable of handling high temperatures, which makes them ideal for demanding applications. They also provide higher loading capacity and faster flow rates compared to standard cellulose filter papers.

Grade 121 is a very thick filter with high wet strength and excellent dirt-holding capacity, allowing it to process heavily contaminated samples without clogging quickly. This makes it ideal for pre-filtration and large-volume sample processing.

The large sheet size is suitable for custom cutting, industrial filtration setups, and high-volume laboratory workflows. It is often used in environmental monitoring, gravimetric analysis, and pre-filtration before membrane filtration.