Qualitative filter papers are often used in routine separation work that still requires high purity and consistent performance. These filter papers covers a wide range of laboratory applications, as liquids clarification, qualitative analytical separations for precipitates and buffers filtration, and are also used for soil analysis and in food and beverage testing.
Standard Grades (Non Wet-Strengthened)
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 (ash content below 0.06%). The inherent strength of standard grades is suitable for routine quadrant folded applications but does not allow a use in vacuum work due to low wet resistance. Grade 3hw is recommended only for general purpose filtration due to a higher ash content (<0.1%) and lower filtration properties.