Quartz Filters are used for air sampling of acidic gases at high temperatures. Quartz fibers are unaffected by humidity, highly resistant to chemical attack, and biologically inert. Filters are prefired at 1832°F (1000°C) for two hours to reduce organic contamination. Show very low trace metals content and do not absorb nitrous and sulfur dioxides. Quartz filters ideal for sampling airborne particulates