Alpha Laboratories Grade 113P Qualitative Filter Paper is suitable for numerous applications in pharmaceutical, biotechnology, chemical industry, atmospheric analysis and environmental testing laboratories as well as for general laboratory use. This extremely pure filter paper is made from cellulose fibres with an alpha content of nearly 100% according to precise norms. The ash content is approximately 0.06%. This Grade 113P Qualitative Filter Paper is supplied as 125mm diameter pre-folded discs with a weight of 87g/m² and a thickness of 0.16mm. The pre-folded format gives improved flow rates and increased loading capacity compared with non-folded filter paper. This makes it ideal for analytical applications involving fast filtration of liquids containing fine particles and provides particle retention in the range 5um to 8um. This filter paper has a fast filtration velocity of 50 seconds and a burst strength > 0.10kg/cm². The Grade 113P Pre-Folded Qualitative Filter Paper is a direct equivalent to popular brands (Whatman No.2V and Schleicher & Schuell No.593) and is supplied in packs of 100.