The CHM® quartz microfiber filters are made with pure quartz microfibers and are free of binders or additives of any kind.  These filters have retention, loading and air permeability features similar to those of the glass microfiber filters. However, since they have greater chemical resistance at high temperatures, they can be used in environments where extreme conditions are present, replacing the glass microfiber filters in such cases.  QF1 Standard grade, QF2 Very pure filter/very low trace levels of heavy metals 

Quartz microfiber filters

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