Qualitative Filter Paper 11 Cm, Standard Grades 1, 2, 4, Bundle Of 3 X 100 Discs Product Details GRADE 1, 2, 4 STANDARD Qualitative Filter Paper APPLICATIONS science : From clean-up of insoluble liquids to routine clarification of suspension food : From solid foodstuffs separation and liquid extraction to fat content determination beverage : From filtration of musts, pulps and syrups to malt analysis agriculture : From soil pre-filtration to analysis environment : From monitoring of fast flowing exhausts to smoke pollution COARSE TO HIGH RETENTION Grade 1 : Metal Sulfates (Pb, coarse form of Ba and Ca) Grade 2 : Metal Sulfides (Cd, Ni, Zn, Fe, Pb, Mn, Ag, As) Grade 4 : Metal hydroxides (Al, Cr, Fe, Mg) , Be Oxide paper : pure cotton cellulose flow : slow, medium, fast retention : 5~10, 10~15, 20~25 ?m (fine, medium, coarse) speed : 15~20 s (10ml DIN 53137) size : ? 110 mm thickness : 140-160 ?m weight : 86 g/m ash : 0.1% qty : 300 discs PLAIN-DISCS Flat Discs are suitable for gravity and Buchner low suction vacuum filtration. EQUIVALENCE SIZE GRADES 1, 2, 4 : 11cm - Equivalent to Whatman Top 3 standard qualitative grades (110mm) GRADE 1 : MEDIUM RETENTION / MEDIUM FLOW - Retains medium crystalline particles (10~15 micron) GRADE 2 : HIGH RETENTION / SLOW FLOW - Retains fine crystalline particles (5~10 micron) GRADE 4 : COARSE RETENTION / FAST FLOW - Retains coarse and gelatinous precipitates (20~25 micron) BROAD APPLICATION RANGE : lab chemistry, food agriculture, brewing wine, air gas filtration 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.