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Laminated PTFE
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SKC offers two types of polytetrafluoroethylene (PTFE) filters:
a) 60.0, 10.0, or 5.0 µm pore size PTFE filters are pure PTFE microfibres fused together at intersection points. These hydrophobic membranes provide ultimate chemical resistance and are temperature stable to 260°C.
b) 2.0, 1.0, or 0.5 µm pore size PTFE filters are comprised of a tighter PTFE membrane laminated onto a PTFE support. These filters have two distinct sides — the tight, smooth PTFE membrane and the rough PTFE support. The application determines the side used. The smooth side is easier to read under a microscope; expose the smooth membrane side to the air when collecting samples for microscopic analysis. The rough side holds dust more effectively; expose the rough laminate support side for gravimetric sampling.
The PTFE filters are:
- Strong and resistant to acids, bases, and solvents
- Hydrophobic
- Low background, interference-free chemical determinations
- Low tare mass for accurate gravimetric analysis
- Temperature resistant to 260°C — autoclavable
- Ideal for aerosol sampling, especially in environments also containing water vapour
- 13 mm filter meets NIOSH Method 5517 specifications
PTFE filters are the versatile choice for size-selective samplers. The material’s unique properties make it ideal for gravimetric, chemical, and/or microscopic analysis of sample particulate. PTFE filters are used for aerosol sampling, air venting and gas filtration.
Specific applications include:
Sampling for Particulate Matter:
PTFE filters with a PMP support ring are the recommended filters for particulate matter samplers such as the SKC Personal Modular Impactor (PMI), the Sioutas Impactor, the IMPACT Sampler, the PEM, and the Button Sampler. These filters feature low back pressure which allows longer sampling periods at higher flow rates to enhance sensitivity. See PTFE filters Part No. 225-1709, 225-1747, and 225-1711.
Sampling for Lactic Acid:
The US pharmaceutical industry has designated lactic acid powder as the surrogate particulate to detect fugitive emissions from drug compounding and pill manufacturing. SKC developed a 25 mm conductive polypropylene cassette with 1.0 µm PTFE filter and polypropylene support pad to minimize wall losses and permit in-situ extraction for enhanced recovery of lactic acid at nanogram levels. See PTFE Filter 225-1725.
Sampling for Metalworking Fluids (NIOSH 5524):
PTFE filter Part No. 225-27-07 with a 2.0 µm pore size and laminated PTFE support may be used with the thoracic Personal Parallel Impactor (PPI) to sample thoracic particulate according to NIOSH Method 5524 for metalworking fluids.
See below for Preloaded PTFE Cassettes.
| Diameter (mm) |
Pore Size (µm) |
Support Pad included † |
Notes |
Pack Size |
Part Number |
| 13 |
5.0 |
No |
unlaminated |
100 |
225-17-03 |
| 25 |
0.5 |
No |
with laminated PTFE support |
100 |
225-2708 |
| 25 |
1.0 |
No |
with laminated PTFE support |
100 |
225-2714 |
| 25 |
2.0 |
No |
with laminated PTFE support |
100 |
225-3726 |
| 25 |
3.0 |
No |
with PMP support ring † |
50 |
225-1711 |
| 25 |
5.0 |
No |
unlaminated |
50 |
225-1728 |
| 37 |
0.3 |
No |
For Anthrax/SARS, laminated spun-bound polyester, available in ready-to-use preloaded cassettes |
100 |
225-1722 |
| 37 |
0.45 |
Yes |
on polypropylene support |
100 |
225-17-04 |
| 37 |
1.0 |
Yes |
on polypropylene support |
100 |
225-17-01 |
| 37 |
1.0 |
Yes |
with laminated PTFE support |
50 |
225-2705 |
| 37 |
2.0 |
Yes |
with laminated PTFE support |
50 |
225-27-07 |
| 37 |
2.0 |
No |
with PMP support ring |
50 |
225-1709 |
| 37 |
5.0 |
Yes |
unlaminated |
50 |
225-17A |
| 37 |
10.0 |
No |
unlaminated |
100 |
225-1729 |
| 47 |
0.5 |
No |
with laminated PTFE support |
50 |
225-2753 |
| 47 |
1.0 |
No |
with laminated PTFE support |
50 |
225-2749 |
| 47 |
2.0 |
No |
with PMP support ring |
50 |
225-1747 |
| 47 |
2.0 |
No |
with laminated PTFE support |
50 |
225-2748 |
| 47 |
5.0 |
No |
unlaminated |
100 |
225-1724 |
| 47 |
60.0 |
No |
unlaminated |
100 |
225-1755 |
† Recommended for use with the Button Sampler
‡ Filter support pads available
Preloaded PTFE Membrane Filters for User Convenience
All SKC preloaded filters include support pad and are in SureSeal leak-free cassettes that require a SureSeal Cassette Opener.
| Diameter (mm) |
Filter and Cassette Specifications |
Pack Size |
Part Number |
| 25 |
PTFE, 1.0 µm with polypropylene pad preloaded in 2-piece conductive cassette, goblet style |
50 |
225-1725 |
| 25 |
PTFE, 1.0 µm with polypropylene support pad preloaded in 2-piece black conductive cassette, goblet style |
50 |
225-1751 |
| 25 |
PTFE, 1.0 µm with cellulose support pad preloaded in 2-piece conductive cassette, goblet style |
50 |
225-1716 |
| 25 |
PTFE, 2.0 µm filters with 60 µm laminated support and polypropylene support pad preloaded in 2-piece black conductive cassette, goblet style |
50 |
225-1750 |
| 37 |
PTFE, 0.3 µm, laminated with spun-bound polyester with cellulose support, unsterilized 3-piece clear styrene cassette, banded; for Anthrax/SARS |
50 |
225-1723 |
| 37 |
PTFE, 1.0 µm with cellulose support, preloaded in a 3-piece, clear styrene (traditional style) cassette, banded |
50 |
225-1715 |
| 37 |
PTFE, 2.0 µm with cellulose ring, 2-piece plastic cassette, banded |
50 |
225-1713 |
| SureSeal Cassette Opener, for opening 25 or 37 mm cassettes |
225-13-5A |
