Quartz fiber has superior dielectric properties, with the lowest dielectric constant and dielectric loss among all mineral fibers. The dielectric constant at 1MHz is 3.70, and dielectric dissipation factor 0.0001. Its electrical insulation performance is also excellent at high temperatures and frequencies, with low density (2.2g/m ³), non hygroscopicity, and excellent mechanical properties, making it the preferred material for low dielectric products like radomes, electromagnetic windows, etc.