Story Glass fiber filters with and without a binder From the company Hahnemühle we offer various glass fiber filters with and without binders for a wide variety of applications. The glass fiber filters are recommended for controlling air and water pollution. Our glass fiber filters have the following properties: Made of 100% micro-borosilicate glass fibers Chemically stable in acidic solutions (except hydrofluoric acid) and alkaline solutions in moderate concentrations Extremely low content of metals Maintains all properties up to 500 °C High flow rate and high air permeability Note on use and weight constancy: No relevant changes in weight due to variations in the ambient humidity. Limited bending resistance: Brushing against other surfaces may cause the loss of fibers. The types GF 6 to GF 55 are available as filter circles in various sizes. Other formats, sheets, rolls and special cuts are available. You can find more information about our glass fiber filters here.