Qualitative cellulose filter papers perform separation by entrapping particulate within the random matrix of cellulose fibers within the depth of the media. This media is widely used in methods requiring the determination and identification of particulate in both liquids and gas. Also, this natural fiber filter paper is commonly used to clarify liquid samples.
Qualitative grade applications and descriptions:
Very widely used filter media demonstrating retention of approximately 11 µm and medium flow rate. Used in a broad range of laboratory and environmental applications, this media is ideally suited in separating lead sulfate, calcium carbonate and calcium oxalate precipitates. This media is the standard for agricultural procedures such as soil and seed sample testing. Also, it is commonly used as a separation media in the food and beverage industry to extract liquids from solid samples.
Due to the consistent bright white color of this media, it is ideal for photometric stain intensity measurement of air samples. The media can also be impregnated with reagents for use in quantifying optical reflectance in gas detection procedures.
A more retentive and absorbent media than CFP1, with approximately 8 µm and a medium to slow flow rate. This media is ideal for general filtration and absorbent conveyance. Commonly used in plant growth trials and monitoring pre-isolated contaminants in air and gas.
The fastest flow rate demonstrated by any of the qualitative cellulose filter medias resulting in a low retention rate of approximately 25 µm. Very commonly used as the first media in a multi-stage filtration process. Ideally suited for use in organic extractions and biological fluid separation processes. Often specified in air monitoring applications where the entrapment of fine particulate is not required.
Filtration of very fine particulate and clarification with applications in environmental sciences and chemical analysis.
Pure cotton 1-5 micron retention, slow flow, smooth surface.
Pure cotton 7-14 micron, medium flow, smooth surface.
Cotton with strengthening agent, 15-19 micron retention, medium-fast flow, crepe surface.
Cotton with strengthening agent, 20-25 micron retention, fast flow, crepe surface.
Cotton with strengthening agent, 30 micron retention, very fast flow, crepe surface.
Cotton with strengthening agent, 15 micron retention, fast flow, crepe surface, fluted folds.
Use the terms below to help you select the type of filter paper that will best meet your needs.
Furnish: The raw materials used in the manufacture of the wet laid product.
Ash content: Dry method, determined in exposure at 900°C air in muffle furnace.
Retention: Nominal retention of particulate at 98% efficiency in liquid.
Flow: Liquid flow rate speed relative to other comparable products listed in this product alignment.
Basis weight: Nominal weight of material per meter2 indicated “gram weight” unit of measure at 8% moisture.
Thickness: As measured under 4 PSI using TAPPI method T411.
Flat/fluted: Flat stock is supplied as sheets, rolls or die cut parts. Fluted is 1/4 or 1/2 quadrant funnel folding.
Surface: Stated as relative to comparable products listed in this product alignment.
Brightness: Stated as relative to comparable products listed in this product alignment.