Whatman 1001-042 Whatman 1001-042 Qualitative Filter Papers; 4.25, Pack Of 100 Product Details Our Whatman filter papers offer you flexibility in filter choice without sacrificing quality. All filters are packaged 100 per box. Qualitative filter papers are used for liquid clarifications, analytical separations, or air and water analysis. The industry standard for high-purity filtration available in a variety of grades and sizes. Description: qualitative filter papers; 4.25 cm dia; pore size, 11µ; 100/box Diameter (cm): 4.25 Pore size (micron): 11 Diameter (mm): 42.5 Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.