| Quantitative Filter Paper, Grade No. 74, Ahlstrom, Closely equivalent to Grade No. 40, Whatman (12) |  |
| Quantitative Filter Paper, Grade No. 54, Ahlstrom, Closely equivalent to Grade No. 41, Whatman (14) | |
| Quantitative Filter Paper, Grade No. 94, Ahlstrom, Closely equivalent to Grade No. 42, Whatman (12) | |
| Quantitative Filter Paper, Grade No. 95, Ahlstrom, Closely equivalent to Grade No. 50, 542, Whatman (15) | |
| Quantitative Filter Paper, Grade No. 55, Ahlstrom, Closely equivalent to Grade No. 54, 541, Whatman (16) | |
| Quantitative Filter Paper, Grade No. 75, Ahlstrom, Closely equivalent to Grade No. 52, 540, Whatman (15) | |
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