Whatman No. 1 PS Water Repellent Phase Separating Paper Whatman. Between the two extreme phases of cotton the PS paper shrinks to retain and enhance the fibers of the cotton and to provide an enlarged window for maximum recovery of the cotton fibers. To enhance recovery even further during the process of removing the muslin phase it is necessary to pre-moisten the paper with a suitable dye. This is done by rubbing the fibers together. Whatman PS Water Repellent Phase Separating Paper is recommended for use in the separation of the cotton phase from the muslin before immersing in water. Whatman PS (Phase Separating) Paper comes as a pack of 100. Specifications for Whatman No. 1 PS Water Repellent Phase Separating Paper Whatman 2200-125 : Diameter cm: 12.5 Whatman No.: 2200-125 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 No. 1 PS Water Repellent Phase Separating Paper Whatman 2200-125/ 28491-146 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 No. 1 PS Water Repellent Phase Separating Paper Whatman 2200-125