Grade 601 Standard Qualitative Filter Papers (Ahlstrom) are 2.5µm medium speed filters which cover a wide range of laboratory applications and is used for clarifying liquids and for rapid filtration of coarser precipitates such as lead sulfate, lead chromate, calcium oxalate, calcium carbonate, aluminum phosphate, barium carbonate, and beryllium hydroxide. Grade 601 can be found in soil analysis, seed testing, and in air pollution to collect dust-laden air and is also commonly used in the food industry to separate foodstuffs from associated liquid or extracting liquids.

Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. These grades contain a high level of alpha-cellulose that provides high purity but will weaken when wet. The inherent strength of standard (untreated) grades does not pose a problem when they are used in routine quadrant folded applications. Not recommended for use in vacuum work or when went handling is required.

• Retention: 2.5µm
• Filtration Speed: 124 sec/100mls (Herzberg), 55 mls/min (Rapidity)
• Medium Loading Capacity
• Equivalent to Grade 1