Advantec offers two grades of quartz fiber depth filters manufactured with high-purity silica microfibers.  Quartz filters have a very low trace metal content and do not absorb NOx and SOx dioxides.  A characteristic of quartz filters is they are highly resistant to chemical attack and are biologically inert.  

Quartz fiber filters are the choosen filter media for air pollution analysis to sample acid gases in stacks and flues at high temperatures >500°C.    

Grade QR100 is prefired at 1,000°C for 2 hours to reduce organic contamination.