Ahlstrom 54: 10 ?m ? Fast Speed. This is a fast filtering grade for rapid filtration of coarse particles and gelatinous precipitates such as iron, zirconium and aluminum hydroxides, and cobalt sulfide. Ahlstrom 54 is also used in air pollution testing to determine gaseous compounds. It is recommended for fast analysis procedures for unstable precipitates such as silicon, which requires speedy filtration. Ashless Grades (Ash 0.007%). These standard ashless grade high purity filter papers are suitable for routine quantitative gravimetric techniques and in the preparation of samples for use in analysis involving instrumental techniques. ? Qualitative analysis ? Low ash content 0.07% (acid-wash treated) ? High-wet-strength ? Consistent performance ? Custom cut ? Bulk packaging Grade 54 Properties: ? Retention: 10 ?m ? Filtration speed (punch Herzberg): 34 sec./100 mL ? Filtration speed (Rapidity): 200 mL/min. ? Loading capacity: Medium