filter papers produced by Hawach are divided into two series, qualitative filter paper and quantitative filter paper. Qualitative filter papers are divided into standard grades and wet strengthened grades. Wet strengthened grades are added a small amount of chemical stabilizer on the basis of the standard grades. Qualitative filter paper ash content is less than 0.1%, and quantitative filter paper ash content is less than 0.007%. Ash content is the biggest difference between qualitative filter paper chemistry lab and quantitative filter paper. As a

laboratory filter paper manufacturer

, Hawach have disc and sheet type, regular or customized size, and shape are all available.