Thomas 6100-0700 Qualitative Filter Paper, 1.5 Micron, Grade, 7cm Diameter x 0.15mm Thick (Pack of 100): Science Lab Qualitative Filter Paper: Amazon.com: Industrial & Scientific
Whatman 1002-047 Quantitative Filter Paper Circles, 8 Micron, 21 s/100mL/sq inch Flow Rate, Grade 2, 47mm Diameter (Pack of 100): Science Lab Quantitative Filter Paper: Amazon.com: Industrial & Scientific
100PK Chromatography Filter Papers, 8 Inch - No. 1 - Used in Separation Experiments & Filter Paper Art - Eisco Labs: Amazon.com: Industrial & Scientific