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 in which
extreme conditions are present, replacing the glass microfiber
filters in such cases. They specially suite for emission monitoring and in general
they allow gravimetric testing in any gas evacuation control
process. They are suitable for ascertaining the level of
heavy metals in atmospheric pollution studies. Features: Retention: Excellent retention
levels for very fine particles, on account of the adsorption
mechanisms of the quartz fibers. Permeability to the air: Very
high, enabling large volumes of air to pass through, thus
they are appropriate for use in high-volume intakes. Temperature stability: Their
temperature stability is higher than the glass microfiber
filters. It is very good up to 900ºC, some loss of
their usual properties setting in beyond that point. Chemical stability: Excellent
stability, with practically no filter-mass losses through
chemical reactions under extreme conditions with the presence
of acid gases (HCl, SO2, SO3, H2SO4, NO and NO3).
