Ahlstrom standard ashless quantitative filter papers are suitable for routine quantitative gravimetric techniques and in the preparation of samples for use in analysis involving instrumental techniques. Maximum ash content is 0.007 percent. Number 74 has a medium flow rate and good particle retention and is the most commonly used acid washed filter. It covers a wide range of general ashless filtration applications including gravimentric analysis, speedy filtering of trace elements, and general soil analysis for separating solid from aqueous extracts. Retention: 2.0 micrometers. Speed: 30 milliliters per minute. No allergens. No choke hazard. Grade level: high school-college.
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