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Grade 2V pre-folded filter paper exposes extra surface area which enables a higher loading capacity and shorter filtration time. whatman Grade 41 -Quantitative Filter Papers - 1441-110, 1441-125, Pore Size-20 m (12.5 cm) Filter Paper (125 Buy Now Grade 1: 11 m (medium flow filter paper) The most widely used filter paper for routine applications with medium retention and flow rate. Grade 2 Qualitative Filter Paper Standard Grade, circle, 150 mm, certified for IS testing. Location: 1111 Howe Filter Paper. What is a 0.22 This Whatman 4.7cm Grade 2 cellulose filter paper is used in qualitative analytical techniques to determine and identify materials. Priced To Announcing! Buy Now GF/B Thicker, stronger version of GF/A. 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"Effects of Temperature and Pore Size on Water Diffusion Inside Carbon Nanotubes."