Industrial Hygiene Filters

Industrial Hygiene Filters

Filter Membranes For Sampling Cassettes

Environmental Express sells both preloaded cassettes and individual sampling filter membranes. We know how important it is to have the right media for the task, which is why we strive to give air quality technicians the broadest range of choice possible. Whether you are performing gravimetric analysis, collecting a sample to test for airborne metals, dust, mold, or asbestos, or searching for filters that are suitable for NIOSH analytical methods, we can match you with the right filters for air sampling cassettes.

Our Products

We have individual sampling filter membranes for sale ranging in diameter from 25 mm to 110 mm, as well as 8-by-10-inch sheets. Material options include:

  • MCE:

    Mixed cellulose ester (MCE) is a durable material made from a mix of cellulose acetate and cellulose nitrate. It is strong enough to support post-sampling analysis, and ideal for use when testing for metals, dust, asbestos, and other air-quality issues.
  • PVC

    Polyvinyl chloride (PVC) filters excel at interference-free silica determinations due to their low ash levels. PVC filters have good gravimetric weight stability and offer low moisture pickup. Zefon sells PVC filters pre-weighed, eliminating the inconvenience of customers having to weigh filters before use
  • Polycarbonate:

    Polycarbonate track-etch (PCTE) filters have a flat surface and well-controlled pore size and shape. They are transparent and nonstaining, and a good option for asbestos testing and scanning electron microscopy applications.
  • PTFE:

    Our PTFE sampling membranes are naturally chemically resistant, making them ideal for sampling in harsh environments. We offer unsupported PTFE filters for NIOSH-method 5013 testing, PTFE filters with laminated support for polynuclear aromatic hydrocarbon testing to NIOSH 5506 and 5515 standards, PTFE filters with a bonded PMP support ring for PM10 and PM2.5 dichotomous air sampling, and extra-durable PTFE filters with a laminated polypropylene support layer.
  • Silver:

    Silver membrane filters are durable and reusable, making them an economical choice for a variety of applications, including those involving aggressive fluids and high temperatures. Our products feature 99.97 percent pure silver construction and are available with a particle retention rating of 0.45 or 0.8 microns.
  • Glass fiber: 

    Our glass fiber filters are manufactured without binders or strengthening agents, from smooth fibers that permit high flow rates, high load capacity and extremely fine particle retention. Multiple grades are available for air monitoring, suspended solid sampling, atomic absorption spectroscopy, and other tasks.
  • Quartz:

    Quartz filters have fine porosity capable of retaining of 0.6 µm particles with 99.999 percent efficiency at a flow rate of 5 cm per second. Heat-treated filters are available for high-temperature applications.

If you need assistance choosing the best product for your sampling application, please contact our Technical Support team directly. You can also visit individual product pages to learn more about specific uses and other technical details.


Item No. Description
F25020T Filters - PTFE, Laminated, 25mm, 0.20µm, 100pk
F25045T Filters - PTFE, Laminated, 25mm, 0.45µm, 100pk
F250800 Filters - MCE w/ pads, 25mm, 0.8µm, 100pk
F250801 Filters - MCE, 25mm, 0.8µm, 100pk
F25100T Filters - Hydrophobic, PTFE, 25mm,1µm, no pads, 100pk
F254500 Filters - MCE w/ pads, 25mm, .45µm, 100pk
F25500PVC Filters - PVC, 25mm, 5.0µm, 100pk
F25505PVC Filters, PVC, w/ Pads 25mm, 5.0µm, 100pk
FM25080 Filters - MCE, Green Grid, 25mm, 0.8µm, 100pk
FPTFE125 FILTER, PTFE w/PTFE SUPP, 1.0µm, 25MM, 100/PK
FQ025MM550 Quartz Fiber Filter, Heat-Treated 550C, 25mm, 100pk
FS2545 FILTER, SILVER, 0.45µm, 25MM, 50/PK
FS258 FILTER, SILVER, 0.8µm, 25MM, 50/PK


Item No. Description
F370800 Filters - MCE w/ pads, 37mm, 0.8µm, 100pk
F370801 Filters - MCE, 37mm, 0.8µm, 100pk
F37100T Filters - PTFE, 37mm, 1.0µm, no pads, 100pk
F37101T Filters - PTFE, 37mm, 1.0µm, w/pads, 100pk
F37200PT-50 Filters - PTFE, 37mm, 2.0µm, with pads, 50pk
F374500 Filters - MCE, 37mm, 0.45µm, 100pk


F37200PT-50 is this product still available?

Yes, this item is still for sale. It is a made to order item and can have up to a month lead time if there is no stock on hand.

Are these filters suitable for NIOSH Method 5040 (Diesel particulate)

These filters do fit the requirements outlined in NIOSH method 5040.

Are these filters binderless, meeting the requirements for Hexavalent Chromium Sampling?

These filters are binderless.

Does this filter meet the requirements for OSHA Analytical Method W4001?

Per OSHA Method W4001:\r\n\r\nWipe samples are collected by using firm hand pressure to move a 37-mm\r\ndiameter polyvinyl chloride (PVC) filter, 5-?m pore size, across the surface\r\nof interest. An alternate medium for rough surfaces is a 37-mm binderless\r\nquartz fiber filter. Samples are digested with multiple buffered solutions.\r\nAfter dilution, an aliquot of this solution is analyzed for hexavalent chromium\r\n(Cr(VI)) by ion chromatography with postcolumn derivatization of the Cr(VI)\r\nwith 1,5-diphenyl carbazide and detected by a UV-vis detector at 540 nm.\r\n\r\nWe have two filters that meet this requirement:\r\n\r\nF37500PVC - Filters - PVC w/ pads, 37mm, 5.0µm, 100pk\r\nF37501PVC - Filters - PVC, 37mm, 5.0µm, 100pk\r\n\r\nWe also offer the alterate medium, a binderless quartz fiber filter:\r\n\r\nFQ037MM - Quartz Fiber Filters - Heat Treated, 37mm, 200pk \r\n\r\n\r\n

Click on an item to see additional information or ask a question.