Whatman Grade No. 1 Filter Paper Whatman. 1 Filter Paper provides highest degree of filtration and achieves the greatest return on investment. Whatman Grade No. 1 Filter Paper is most commonly used in the pre-filtration stage of distillation and other chemical operations where the greatest amount of recovery of active ingredient is required. This particular grade of Whatman Filter Paper is most commonly used for the pre-filtration or pre-concentration of crude acids and bases; however it can be used for the concentration of acid base solutions buffering operations and the preparation of buffered wine and beer from grape musts. The strength of the Whatman No. 1 Filter Paper will determine the degree of retention and the amount of product that will be retained in the final step of the distillation process. Specifications for Whatman Grade No. 1 Filter Paper Whatman 1001-320 : Size cm: 32.0 dia. Whatman No.: 1001-320 Unit: Pack of 100 Porosity: Medium Flow Rate: Medium Particle Retention: 11 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 No. 1 Filter Paper Whatman 1001-320/ 28450-229 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 No. 1 Filter Paper Whatman 1001-320