Seems you asked your question poorly. Based on the answers, I think you meant to ask if it's dangerous.

And it isn't dangerous, since they are long fibres that aren't loose. The danger is from fibreglass dust. That said, they suck as filters. A paper filter will catch much more dust.

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GLASS FIBER FILTERS

Glass Fiber Filters are composed of pure borosilicate fibers, with or without organic resin binder.

Sterlitech and Advantec brand Glass Fiber Filters are available in a variety of nominal pore size ratings and flow rates, to suit a wide range of applications. The purity of glass filters is dictated by the presence of binder material that acts as a strengthening agent and aids in holding the fibers together. Binderless Glass Fiber Filters offer high purity and exceptional thermal/chemical resistance. Glass filters with organic resin binder have limited resistance, but offer improved wet strength and reduced potential for fiber shedding.

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Due to their superior throughput compared to other fiber filters, Glass Fiber Filters are typically used in removal of sediment and coarse particulate. High flow rates enable ideal use in applications like single and multi-process removal of sediment and coarse particulate. They are also commonly utilized in pre-filtration prior to membrane filtration for food, beverage, life science, and biopharmaceutical applications.

View the Glass Fiber Filter Data Sheet or compare glass fiber grades across brands with our Brand Equivalent Table.

Glass Fiber Comparison Table

Grade Features & Applications Nominal Retention Thickness Weight (g/m²) Water Flow a Max. Op. Temp. Binder Whatman Equivalent Sterlitech&#; 934 AH Standard for suspended solids content and related measurements (SM D and EPA Methods 160.2). 1.5 µm 0.43 mm 64 47 550°C None 934-AH Grade A Precipitate proteins and cell filtration, scintilliation counting, determination of airborne particulate. 1.6 µm 0.3 mm 55 12 475°C None GF/A Grade A-E Suspended solids and air monitoring. HEPA type air filter. 1 µm 0.33 mm 60 15 475°C None - Grade B Collection of denatured biochemical polymers. Gas filter or prefilter. 1 µm 0.65 mm 140 30 475°C None GF/B Grade C RIA procedures and harvesting lymphocytes. 1.2 µm 0.28 mm 50 25 475°C None GF/C Grade D Higher volume and repetitive laboratory filtering. General prefilter. 2.7 µm 0.6 mm 120 5 475°C None GF/D Grade E Suspended particle analysis in water, cell harvesting, prefiltration and air monitoring applications. 1.5 µm 0.35 mm 70 12 475°C None - Grade F Diluted aqaueous solutions containing strong oxidizing, acidic, or alkaline components prior to laser spectroscopy. Meets requirements for EPA Method (TCLP). 0.7 µm 0.4 mm 80 80 475°C None GF/F TCLP Acid treated and multi-stage deionized water rinsed. Meets requirements for US EPA Method . 0.7 µm 0.4 mm 80 80 475°C None GF/F Grade TSS Designed for EPA Methods C and D for testing dissolved and suspended solids in water and wastewater. Excellent wet strength. HEPA type air filter.  1.5 µm 0.43 mm 64 47 475°C None - Grade VSS Meets requirements for Standard Method E, C, D, and EPA Method 160.2. Air pollution monitoring, high temperature flue gas and filtration of high temperature solvents. 1.5 µm 0.43 mm 64 47 550°C None - Advantec&#; DP-70 High wet strength, very high loading capacity. Dust measurement. 0.6 µm 0.52 mm 170 20 120°C Organic - GA-55 General purpose paper, air pollution monitoring. HEPA type air filter.  0.6 µm 0.21 mm 55 23 500°C None GF/A GA-100 General purpose paper. Filter precipitated proteins or cells. Air pollution monitoring. 1 µm 0.44 mm 110 11 500°C None - GA-200 Thick filter. Viscous fluid filtration (sugars and gels). HEPA type air filter. 0.8 µm 0.74 mm 175 15 500°C None - GB-100R Low trace metal content of As, Pb, and Cd. High and low volume aerosol testing for airborne dust and metal contaminants. DNA/RNA and protein precipitate filtration. HEPA type air filter. 0.6 µm 0.4 mm 95 15 500°C None EPM GB-140 Compared to GB-100R: Thicker, greater wet strength, slower filtration speed. Industrial waste analysis. HEPA type air filter. 0.4 µm 0.56 mm 140 58 500°C None GF/B GC-50 Common prefilter (for 0.45 µmm or smaller pore sizes). Scintillation counting. Suspended solids analysis of industrial water and wastewater. HEPA type air filter. 0.5 µm 0.19 mm 48 28 500°C None GF/C,
934-AH GC-90 High wet strength. Filter for clinical screening. HEPA type air filter. 0.5 µm 0.3 mm 100 20 120°C Organic - GD-120 High wet strength, very high loading capacity. Common prefilter (for 1.2 µm or smaller pore sizes). 0.9 µm 0.51 mm 123 14 500°C None GF/D GF-75 Most retentive grade. Suitable for collection of IgC and other very fine protein precipitates. Clarifies chemically aggressive solutions. Meets requirements for TCLP (EPA method ). HEPA type air filter. 0.3 µm 0.35 mm 75 84 500°C None GF/F GS-25 Limited dirt holding capacity, high wet strength. Common prefilter (for 0.65 µm or smaller pore sizes). HEPA type air filter. 0.6 µm 0.22 mm 70 15 120°C Organic - QR100 (Quartz) Superior chemical resistance. Acidic gas sampling at high (>500°C) temperatures, pollution analysis. Pre-fired at °C for 2 hours to reduce organic contamination. HEPA type air filter. - 0.38 mm 85 - °C None QM-A QR200 (Quartz) Superior chemical resistance, does not absorb acidic gases. Sample acidic gases at high (>500°C) temperatures, pollution analysis.HEPA type air filter. - 1 mm 200 - °C Inorganic -

a The time in seconds to filter 100 mL of distilled H20 at 20°C under pressure supplied by a 10 cm water column through a 10 cm² section of filter

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