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F-499
Whatman GF/A glass fiber filter, 2.1 cm diameter
F-500
Whatman GF/A glass fiber filter, 3.7 cm diameter
F-503
Whatman GF/A glass fiber filter, 4.25 cm diameter
F-505
Whatman GF/A glass fiber filter, 4.7 cm diameter
F-510
Whatman GF/A glass fiber filter, 5.5 cm diameter
F-520
Whatman GF/A glass fiber filter, 9.0 cm diameter