Cole-Parmer® Ashless Filter Papers

• High-purity, acid-washed filters with high wet strength

Grade 94 filters are fine retention filters for analysis of fine particles such as barium sulfates, lead sulfates, stannic or nickel sulfide, calcium oxalate, and calcium fluoride. Grade 74 filters are well-suited for general filtration such as analysis of clay, copper, bismuth, silicon, and iron. Grade 54 filters are ideal for filtration of coarse or gelatinous precipitate, namely iron, zirconium, or aluminum hydroxides, and cobalt sulfide. Sold 100/pk