Coated (Treated) Filters

SKC offers coated filters to meet a variety of OSHA, NIOSH, ASTM, and international agency methods. 

Some chemicals are not effectively trapped by any solid sorbent without special preparation. Chemical coating is carried out on various sorbents to trap aldehydes, nitrogen dioxide, amines and many more compounds. Coated filters make sampling reactive compounds fast and easy. They are a convenient alternative to wet chemistry methods using impingers. Simply unplug the lightweight cassette, insert it into an SKC Filter Cassette Holder, clip holder to a worker’s collar, and attach to a personal sampling pump. Use coated filters to collect compounds that exist as an aerosol or mist or for some higher boiling vapours. Flow rates are typically greater than 1 L/min and sampling times range from 15 minutes to one hour. Most coated filter samples are extracted in solvents and analysed by gas or liquid chromatography.

Coated Filters
  • Ready to use
  • Time-saving
  • Convenient alternative to impinger wet chemistry methods
  • Economical
  • No assembly required - preloaded into cassettes with end plugs and shrink bands
  • Meet agency method specifications
  • No cumbersome collection liquids or glass
  • Easy personal sampling
  • Small package size for short shelf-life product

The methods listed are the most widely used. Note also that coated filters have a limited shelf life and are supplied in 37 mm cassettes unless otherwise noted.

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