Whatman Grade GF/D Glass Microfiber Filters Whatman. Pre-filtering to achieve the grade required by the specific user application often requires a tighter mesh something Whatman Grade GF/D Glass Microfiber Filters offer. Whatman Grade GF/D Glass Microfiber Whatman Filters are used for holding a predetermined volume of slurry before it is returned to the user in a filtered state. Whatman Filters whatman f/d grade whatman 1823-090 25 Pack can be used for general-purpose straining as well as for filtering slurries prior to filtration and pre-filtration. Whatman GF/D Glass Microfiber Whatman Filters also allow a predetermined volume of slurried urine to be returned to the user. Specifications for Whatman Grade GF/D Glass Microfiber Filters Whatman 1823-090 : Diameter cm: 9 Whatman No.: 1823-090 Unit: Pack of 25 Porosity: Coarse Flow Rate: Fast Particle Retention: 2.7 m (Please note that the description and stock photo may not correspond to the specific model listed above) We offer only genuine Whatman products authorized for sale in the U.S. and other markets so you can be sure that you are buying authentic Filters with a full manufacturer's warranty in addition to our own 100percent Satisfaction Guarantee. We are your premier online distributor for Whatman Filters. We are an authorized supplier to all federal and state government agencies as well as to research and educational institutions and can facilitate volume orders on many types of laboratory equipment lab consumables and other products to help fulfill your specific needs. We offer Free Shipping and FREE USPS shipping to APO and FPO addresses on all orders in our store over 49. Please refer to our APO/FPO Shipping and Export Restrictions for more information on export to APO/FPO addresses. In addition to the Whatman Grade GF/D Glass Microfiber Filters Whatman 1823-090/ 28161-491 we carry a full complement of Filters as well as other product offerings from Whatman. We also carry a full line of Whatman accessories to help meet your laboratory and scientific needs. For a complete selection of Whatman Filters please visit our Whatman page. For more brand name Filters please visit our Filters store section. To see our complete line of lab medical industrial and scientific products please see our science and lab equipment online catalog. Whatman Grade GF/D Glass Microfiber Filters Whatman 1823-090