Vacuum Traps and Filters

Traps vs. Filters: Product Overview

Traps and filters are devices installed on a vacuum foreline to serve two different functions:

  • Traps: A trap is a device that is designed to capture vapors and gases.
  • Filters: A filter is a device that is designed to capture or reduce particulates, dust, smoke, and aerosols.

Selection Criteria

When selecting a trap or filter, there are three selection criteria:

  • Body style
    • Coaxial, inline, or right angle
    • Body Volume
      • Large body volume: allows larger gas flows, higher conductance, and a lower frequency of media change outs
      • Small body volume: smaller footprint
    • Housing style
      • Sealed traps: Ideal for light gas loads or intermittent use – discarded after the media has been consumed
      • Rechargeable traps: Housing is reused and only the media is replaced.
  • Port terminations
    • Tube end terminations: for vacuum systems with a base pressure of 10-3 Torr or higher
    • ISO-QF and ISO-LF terminations with elastomeric seals: for vacuum systems with base pressures between 10-3 Torr and 10-8 Torr
    • ConFlat (CF) terminations: For vacuum systems with base pressures less than 10-8 Torr
  • Media
    • Activated Charcoal: recommended for organic effluents due to its affinity for organic molecules
    • Stainless steel wool: can be used for extracting both PFPEs and hydrocarbons. It is susceptible to moisture saturation and cannot be packed tightly.
    • Copper: Immune to moisture saturation but susceptible to corrosion. Compatible with applications that involve removing hydrocarbons; will not work with PFPE extraction.
    • Alumina: Versatile filament that can be packed densely and has the ability to trap moisture. Recommended for applications involving hydrocarbon removal. Not recommended for high-moisture operations or applications that involve removing PFPEs.

    Vacuum Traps Selection Guide

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