Pack Of 100 Sheets Of Filter Paper, Qualitative, Grade 1, 185 Mm. Product Details Filter Paper, Qualitative, Grade 1, 185 mm Pack of 100 sheets. Supertek Qualitative filter papers are made from virgin cellulose fiber. Grade 1 filter papers are suitable for medium flow rate and medium retention applications. Grade 1 filter papers are the most widely used in general laboratory use. They are frequently used to purify or clarify liquids. They are frequently used to separate precipitates or sediment from liquid for further analysis. Supertek Grade 1 Filter Paper will retain particles down to 9 nanometers in size. Very useful in waste water treatment, soil analysis or seed testing, education and in the commercial food industry, Virgin Cellulose Fiber 9 Nanometers Retention Filtration Qualitative Filter Paper Medium Flow and Retention Rates 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.