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推荐用于空气和水污染的监测。
由100%硼硅酸盐玻璃纤维制成。
玻璃纤维滤芯可拦截液体中粒径小至1 μm的细微颗粒，甚至能捕获空气和气体中粒径为0.3–0.5 μm的气溶胶。
巨大的比表面积（约2平方米/克）确保了卓越的吸附能力。
金属含量极低。
化学稳定性：在接触适度浓度的酸溶液（除氢氟酸外）和/或碱溶液时，仍能保持所有性能。
高温稳定性：在500 ºC以下仍能保持所有性能。
高流速和高透气性。
这些型号提供圆形滤芯，尺寸（单位：毫米）如下：
25 – 37 – 47 – 50 – 55 – 70 – 90 – 110 – 125 – 142 – 150。
每包100个。
卷筒、单张及其他规格可根据要求提供。
| Grade | Air permeability * [L/m2s] | Retention rate % NaCl-particle size <1 μm *** | Filtration Gurley [s] | Weight [g/m²] | Thickness [mm] | Max T [ºC] |
|---|---|---|---|---|---|---|
| GF 50 | 33 | 99,993 | 19 | 56 | 0.29 | 500 |
| GF 51 | 11 | 99,993 | 44 | 140 | 1.00 | 500 |
| GF 52 | 54 ** | 99,995 | 25 | 54 | 0.28 | 500 |
| GF 55 | <10 | 99,999 | 67 | 75 | 0.40 | 500 |
* According DIN EN ISO 9237 ** Air resistance in mbar at 400 cm³/s, A= 10 cm² *** Tested with NaCl particles size <1 μm, main fraction at 0.3 to 0.5 μm
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