Ahlstrom 55 Hardened Ashless Quantitative Filter Papers are specially treated for critical quantitative analytical techniques requiring increased wet-strength and handling capacity. These high purity filter papers have a tough, smooth surface free of loose fibers and are ideal for collecting wet precipitates.

Grade 55 is a 15µm fast speed filtering grade for gravimetric analysis of coarse particle and gelatinous precipitates (i.e: aluminum and zirconium hydroxides) in acid and alkali solutions. Grade 55 is also used in air and food analysis and for chloride and phosphorous in cement, coal, and coke.

Key Features

• Retention: 15.0µm
• Filtration Speed: 31 sec/100mls (Herzberg), 220 mls/min (Rapidity)
• Medium Loading Capacity
• Equivalent to Grade 541