Hawach Scientific Co., Ltd qualitative filter paper chemistry lab is divided into standard grade and wet strength grade. The wet strength grade adds a small amount of chemical stabilizer to the standard grade. Wet strengthened grades are with better moisture resistance. The ash content of filter paper 1 is less than 0.1%. Qualitative filter papers cover a wide range of laboratory applications and frequently used for clarifying liquids. Wet strength filter paper disc exhibits excellent compression resistance under high pressure and vacuum laboratory conditions and is not easily damaged.