Whatman Filter Paper No.1 diameter 11.0cm - The most widely used filter paper for routine applications with medium retention and flow rate.- This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids. - Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulfate, calcium oxalate (hot) and calcium carbonate.- In agriculture, it is used for soil analysis and seed testing procedures. - In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.- In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain-intensity measured photometrically. For gas detection, the paper is impregnated with a chromogenic reagent and colour formation quantified by optical reflectance. - Grade 1 (No.1)- Diameter : 110 mm (11 Cm) - Quantity : 1 box (100 pieces) Our Policy - Payment: I accept only PayPal. - Shipping: Free shipping handling worldwide. The package will be shipped directly form Thailand via Standard small package Airmail, no tracking number (if you want it, you can get it here) , and it will take about 11-23 business days. - Return Policy: 100% Satisfaction Guarantee: If you are not satisfied with the product you purchased for any reason, please contact us for a return instruction within 14 days for a refund. Shipping & Handling costs are not refundable. Return shipping cost will be paid by buyer. - Contact : Please contact me via eCRATER message only. - Problem with my product: In case, if you are not satisfied with your purchase, please give me a chance to resolve the issue. Please contact me for any question or complaint and I will do my best to satisfy you with your purchase.