Filtech Quantitative Filter Papers ;

• Produced from extremely high purity, acid washed paper designed for use in analytical applications and gravimetric analyses
• Manufactured from 100% high quality cotton fibres using ultra-pure, reverse osmosis water
• Final acid treatment removes any remaining organic or inorganic impurities
• Qualitative grades have an ash content of 0.007%, and in the hardened form 0.006%

Specially treated high purity, hardened ashless papers are available for applications requiring increased wet strength and handling capacity.  These hardened grades have a tough, smooth surface free of loose fibres that is ideal for collecting wet precipitates and are generally used because of their high chemical resistance to acid and alkali.