Speclon Filters PTFE Membrane Material

See where we use Speclon filters on the Instruments page

Speclon PTFE Membrane Filters in diameters of 30mm, 33mm, 37mm, and 47mm and in pore sizes of 1.5 micron and 5.0 micron.

Speclon™ PTFE Membrane Filters

High sensitivity alpha-in-air spectroscopy is dependent on spectrum resolution. Because of the excellent surface deposition qualities of the PTFE membrane filter, the full-width half-max (FWHM) alpha peak resolution is significantly improved over glass fiber, cellulose or acetate filter media.  As a result of using the PTFE membrane filters in an alpha CAM, the minimum detectable concentration can be improved by as much as 30% and allow either faster alarm response times or reduced false alarms.

General Features

Bladewerx Speclon PTFE-membrane filter media is recognized for its superior surface deposition characteristic, resulting in sharper energy resolution for alpha spectroscopy applications.  Whether the application is continuous air monitoring, or personal/fixed air samplers with retrospective analysis, Speclon filters can provide a cost-effective alternative to glass fiber, cellulose, or acetate filters.


In alpha air monitoring for plutonium or transuranics, improved energy resolution means reduced background from interfering radon decay peaks.  In many facilities, alpha air quality is determined retrospectively by gross counting after radon daughters have been decayed.  By switching to Speclon filters, samples can be counted immediately using alpha spectroscopy, without waiting for radon products to decay, thereby improving worker safety.

Filter Comparison Chart displaying the full width half max of speclon ptfe, acetate, cellulose and glass fiber filters

Stock Options and Part Numbers

Standard Fixed Filter disks are available in boxes of 100 each

BSP-FILT-50B037   37 mm diameter, 5.0 µm pore

BSP-FILT-50B047   47 mm diameter, 5.0 µm pore

BSP-FILT-15B030   30 mm diameter, 1.5 µm pore

BSP-FILT-15B033   33 mm diameter, 1.5 µm pore

BSP-FILT-15B037   37 mm diameter, 1.5 µm pore

BSP-FILT-15B047   47 mm diameter, 1.5 µm pore


Standard Moving Filter Rolls are available in 15 meter lengths

BSP-FILT-5R           35 mm X 15 meters, 5.0 µm pore


Custom Bladewerx Speclon filters can be made to meet any sampling rate, collection diameter, or roll length requirement.

Moving Filter Roll for Canberra iCAM Moving Filter Head or for Berthold LB 9140, BAI 9128, or BAI 9100D Moving Filter Monitors

Moving Filter Rolls

can be custom sized

to fit your apparatus

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