Whatman has developed a new filter medium by combining two microfiber filters in one. Manufactured from 100% borosilicate glass microfibres, the filter is binder free and unique in its construction: a course layer on top of, and meshed with, a fine layer. This filtration technique allows for higher particle loading capacity, faster flow rate and and life extendance of the filter. Multiple porosities means greater filtration efficiency. The Multigrade GMF 150 represents the new dimension in separation science leading to faster and more cost effective filtration.