Gravi-Sert Filter Capsule :: 37mm Air Sampling Cassettes :: Air Sampling Cassettes - Preloaded :: Sampling Medias & Cassettes :: Zefon International, Inc.

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Zefon International, Inc. :: Sampling Medias & Cassettes :: Air Sampling Cassettes - Preloaded :: 37mm Air Sampling Cassettes :: Gravi-Sert Filter Capsule

Gravi-Sert Filter Capsule  
Gravi-Sert Filter Capsule 
Printable version

The Gravi-Sert™ filter capsule is a self-contained filter “cassette capsule” that captures all particles collected by a filter cassette. It consists of a PVC filter membrane sealed to a static-dissipative PVC shell to create the capsule. This capsule is then weighed and inserted into a Zefon 2-Piece filter cassette with a support pad as a complete unit. After sampling the entire capsule is removed and weighed.

  • Contains 100% of the sample collected within the capsule.
  • Manufactured from weight-stable PVC materials.
  • PVC shell is static-dissipative
  • Meets NIOSH requirements for including "wall deposits" as part of the sample.

How it works

Air flows into the filter cassette through the inlet and continues into the Gravi-Sert™. Particulate is then contained within the Gravi-Sert™ while the airflow continues through the filter membrane and exits out the cassette outlet.

Shell Material: PVC (static-dissipative)
Filter: 5.0µm pore size, Polyvinyl chloride (PVC)
Weight: ~300 mg @ 50% RH


Gravi-Sert™ is suitable for use in methods that require gravimetric analysis including the following:

Contaminant NIOSH Method
Carbon Black
Dust - Total
Dust - Respirable

Additional Information Available

Accounting for Cassette Wall Deposits Gravimetrically - The Zefon Gravi-Sert Solution

Reference Articles

NIOSH Manual of Analytical Methods - Consideration of Sampler Wall Deposits
NIOSH Manual of Analytical Methods, Chapter O
NIOSH and AIHA Developments on Including Closed Face Cassette Wall Deposits
NIOSH Guidelines for Aerosol Sampling Presentation
OSHA On Wiping the Interior Walls of 37-mm Closed-face Cassettes: an OSHA Perspective

Gravi-Sert™ is a trademark of Zefon International, Inc.
Manufacturer Zefon International
U/M See Description
Stock Status Normally ships within 24 Hours

Product Price Order

  37mm Gravi-Sert Filter Capsule, 50/pk
  Product #: PVPV-C3750


  25mm Gravi-Sert Filter Capsule, 50/pk
  Product #: PVPV-C2550


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All products and prices posted are valid for sale in the USA only
If you are not from the USA, CLICK HERE to locate
an Authorized Zefon Distributor in your area.

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An ISO 9001-2008 Certified Company