Whatman Quantitative Filter Paper, Ashless, Grade 42, 24 cm 1442-240 (Package of 100 Circles): Amazon.com: Industrial & Scientific
FILTER PAPER QUANTITATIVE,GRD 42,ASHLESS,SLOW,55MM,100/PK
GE Healthcare 1442-090 Grade 42 Ash Less Filter Paper for Instrumental Analysis, Circle, 90 mm Diameter (Pack of 100): Amazon.com: Industrial & Scientific