Material: borosilicate glass (fibres), inorganic binding agent. Chemically resistant to the majority of organic and inorganic solvents, aggressive chemicals and highly concentrated bases (not resistant to hydrofluoric acid) Constant weight, negligible influence on fluctuations in ambient humidity Mechanically stable (limited bending resistance) Note: filter units and clamping fixtures must have flexible sealing surfaces. Glass fibre round filters Type GF 92 Applications: environmental analysis, biology, drinks industry. Use: membrane upstream filters, soot extraction from gas analysers. Filtration speed: medium-fast Surface weight: 70 g/m 2 Retention range: 2-3 µm Thickness: 0.35 mm