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Glass Microfiber Filter, Diameter 5.5 cm, Grade A, Thickness 0.3 mm, Pore Size 1.6 um, Material Binderless Borosilicate Glass Microfiber, Product Type Filter, Maximum Operating Temperature - Centigrade 500 Degrees C, For Use With Liquids or Air, Package Quantity 100 Lab Safety Supply filter membranes are constructed with binderless glass microfiber. The Grade A, fine porosity filters feature a fast flow rate, with a 1.6um size particle retention. They are frequently used in the filtration of precipitated proteins and cells, and are ideally suited for use as a filter for radioimmuno assay of weak beta emitters by scintillation counting and gravimetric determination of airborne particulate. Glass microfiber filters are produced from 100% borosilicate glass microfiber without the use of binde.