The industry standard for high-purity filtration. There are a variety of smooth-surface papers for every need. All are high quality, ashless, and offer excellent wet strength.

Grade 40: is a general-purpose filter which offers medium-speed filtration and retention. (8µm)
Grade 41: is the fastest ashless paper; and used for analytical procedures involving coarse particulates. (20-25µm)
Grade 42: has extremely fine particle retention and is for gravimetric analysis and very fine precipitates. (2.5µm)
Grade 43: is a moderately fast filter for foodstuff and soil analysis, particle collection in air pollution monitoring and inorganic analysis. (16µm)
Grade 44: gives the lowest ash weight for any disc size and has a higher flow rate but is slightly less efficient than Grade 42. (3.0µm)
Grade 541: is a general-purpose hardened ashless paper, with medium retention and flow rates; it is also resistant to acids and bases. (20-25µm)

All Grades: Packaged 100 per Pack.

Filter Paper, Grade 541, Quantitative, Hardened, Ashless, 18.5cm, 100/pk, Ge Healthcare Whatman, 1541-185, Empty, Empty, 112.6600, PK, , | LabSource.com

Filter Paper, Grade 541, Quantitative, Hardened, Ashless, 4.7cm, 100/pk, Ge Healthcare Whatman, 1541-047, Filter Paper, Grade 541, Quantitative, H, Filter Paper, Grade 541, Quantitative, H ardened, Ashless, 4.7cm, 100/pk, 22.3100, PK, , | LabSource.com

Filter Paper, Grade 44, Quantitative, Ashless, 18.5cm, 100/Pk, Ge Healthcare Whatman, 1444-185, Empty, Empty, 98.4800, PK, , | LabSource.com

Filter Paper, Grade 44, Quantitative, Ashless, 12.5cm, 100/Pk, Ge Healthcare Whatman, 1444-125, Empty, Empty, 52.8200, PK, , | LabSource.com

Filter Paper, Grade 44, Quantitative, Ashless, 9.0cm, 100/Pk, Ge Healthcare Whatman, 1444-090, Empty, Empty, 37.4900, PK, , | LabSource.com

Filter Paper, Grade 43, Quantitative, Ashless, 11.0cm, 100/Pk, Ge Healthcare Whatman, 1443-110, Empty, Empty, 45.8000, PK, , | LabSource.com

Filter Paper, Grade 40, Quantitative, Ashless, 24.0cm, 100/pk, Ge Healthcare Whatman, 1440-240, Empty, Empty, 156.4100, PK, Filtration>Membrane Filters, Quantitative, | LabSource.com

Filter Paper, Grade 541, Quantitative, Hardened, Ashless, 12.5cm, 100/pk, Ge Healthcare Whatman, 1541-125, Filter Paper, Grade 541, Quantitative, H, Filter Paper, Grade 541, Quantitative, H ardened, Ashless, 12.5cm, 100/pk, 52.8200, PK, , | LabSource.com

Filter Paper, Grade 541, Quantitative, Hardened, Ashless, 9.0cm, 100/pk, Ge Healthcare Whatman, 1541-090, Filter Paper, Grade 541, Quantitative, H, Filter Paper, Grade 541, Quantitative, H ardened, Ashless, 9.0cm, 100/pk, 38.7700, PK, , | LabSource.com

Filter Paper, Grade 44, Quantitative, Ashless, 7.0cm, 100/Pk, Ge Healthcare Whatman, 1444-070, Empty, Empty, 26.9500, PK, , | LabSource.com

Filter Paper, Grade 42, Quantitative, As, Whatman Inc, transfer F28-129, Filter Paper, Grade 42, Quantitative, As, Filter Paper, Grade 42, Quantitative, As, 94.8800, PK, , | LabSource.com