Ahlstrom offers a full range of glass microfiber filters manufactured from 100% pure borosilicate glass. Because of their intrinsic properties, glass microfiber filters have wide applications in many areas of laboratory analysis, especially when fine filtration and high loading capacity is required. Applications for Ahlstrom glass microfiber filters include environmental analysis for water, wastewater, testing of soils, air pollution and monitoring, research and process biochemistry, and gravimetric analysis involving ignition of samples. Ahlstrom glass microfiber filters are also found in the filtration of hot gases and liquids, and in pre-filtration. Laboratory analysis 100% pure borosilicate glass Rapid flow rate Fine particle retention 0.7µm – 3.1 µm High loading capacity Chemical and thermal resistance (up to 500°C) Long shelf life Brilliant white color reflecting more than 96% of visible light Custom cut Standard Glass Microfiber Filters Standard glass microfiber filters contain no binders or other additives that may cause interference to sensitive enzymatic or other chemical reactions. The unique characteristics of glass microfiber filters make its use particularly advantageous to laboratory filtration by enabling fast filtration of large volumes and difficult solutions without premature clogging. Ahlstrom 131: 1.0µm – Medium Speed This standard grade found in many environmental applications offers slightly more retention than Ahlstrom 111 with slightly lower filtration speed and loading capacity. Ahlstrom 131 is recommended for the collection of suspended solids in potable water and in industrial wastes. In biochemical tests, Ahlstrom 131 is suited for cell harvesting, liquid scintillation counting and the analysis of carbohydrates. STM 2530 Particulate Floatables Standard process to measure the quantity of particles that have a density less than that of the surrounding water, such as oil and grease, via gravity separation. Grade 131 has the fine porosity needed for this test.