Ashless Cellulose Filter Paper such as the Whatman 41 series is commonly used in quantitative analytical techniques such as gravimetric analysis. E.G.: To convert precipitate to a stable weighing form, a chemist may wish to ignite the filter paper containing collected precipitate in a pre-weighed crucible, thereby removing the filter paper with minimal and uniform residual “ash”. Cellulose paper is also commonly used for smears or swipes. Cellulose paper is not recommended with pumps that can’t overcome large pressure drops (e.g. battery operated centrifugal type) or, where required, to maintain a constant flow rate over the entire sampling period.
Whatman, Grade 41: 20-25μm.
The fastest ashless filter paper, recommended for analytical procedures involving course particles or gelatinous precipitates (i.e., iron or aluminumhydroxides). Also used in quantitative air pollution analysis. Cellulose paper is also commonly used for smears or swipes.
Carbon Impregnated Filter Media.
Carbon impregnated cotton fiber filter media contains 50-55% Carbon by weight. Basic Weight is 130 lbs./3000 ft2. The paper is available in all standard die sizes and is generally used to qualitatively determine the presence of Iodine in a sampling environment. The paper resists most dilute acids (not suitable for warm alkaline solutions).
Typical Performance Summary on Glass Fiber Filter Media
This data has been taken from production runs to show “Typical” properties. This is to be used as a guide and is not a specification sheet.
|Media Type||Pressure Drop @ 2 CFM||DOP Efficiency 0.3µm ASTM method D-2986||Binder||Efficiency (@ 4-8 PSI)||Thickness||Fiber Type|
|FP2063-47||8 inches H20||97%||Acrylic||High||0.016 inches||100% Borosilicate Glass Microfiber|
|FP2061-47||8 inches H20||97%||Acrylic||High||0.016 inches||100% Borosilicate Glass Microfiber|
|FP47M||8 inches H20||97-98%||Acrylic||High||0.020 inches||100% Borosilicate Glass Microfiber|
|FP47||17 inches H20||99.98%||None||Very High, HEPA Quality||0.017 inches||100% Borosilicate Glass Microfiber|
|FP5211-47||18 inches H20||99.99%||Acrylic||Very High, HEPA Quality||0.015 inches||100% Borosilicate Glass Microfiber|
|FPAE-47||26 inches H20||99.99%||None||Very High, HEPA Quality||0.020 inches||100% Borosilicate Glass Microfiber|
|FP2000-47||24 inches H20||99.99%||None||Very High, HEPA Quality||0.017 inches||100% Borosilicate Glass Microfiber|