PTFE compounds
Filled PTFE, compounded for the duty.
Glass, carbon, graphite, bronze and MoS2 filled grades, made to the property sheet you specify. Each grade has published limits, a datasheet and a certificate for every lot. Send the duty through the requirement builder and we reply by email with a grade and what to test.
PTFE resin blended with the filler to a stated weight percent. Filler content, density, tensile, elongation, deformation under load, friction and wear are measured on moulded and sintered plaques and reported with the method.
Free-flowing compound powder for compression moulding, isostatic moulding and ram extrusion. Moulded or extruded stock shapes (rod, tube, sheet) on request. Your own machinist or seal maker makes the finished part. Minimum order and lead time are on each grade.
Every lot ships with a certificate of analysis. Enter the lot ID under Track to open the lot record, and follow your order from confirmation to delivery in the same place.
PTFE is rigid and does not recover like rubber. It is used as a ring, seat, jacket, bearing or gasket, often with a spring or an elastomer energiser. The filler sets wear, creep, friction and chemical limits, so the filler is the choice that matters.
Filler chooser
Which filler should I look at first?
Answer six questions. You see which filler systems to look at first, which ones your fluid rules out, and which published grades carry them. It runs in your browser and sends nothing.
Grades
Published PTFE grades
Open a datasheet, or start a requirement from a grade and change only what you need. Grades marked as samples show how a Pascalor PTFE datasheet is laid out. All datasheets as PDF downloads.
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Fillers at a glance
What each filler does, and what it gives up
Typical contents are weight percent of the compound. A grade name states the main filler and its content. Read the guide for the evidence behind each line.
| Filler | Typical content | What it gives | What to watch | Guide |
|---|---|---|---|---|
| Glass fibre | 15 to 25 % | Low wear and low creep. An electrical insulator. | Abrasive to soft counterfaces. Hydrofluoric acid and hot strong alkali attack glass. | Glass-filled PTFE |
| Carbon fibre | 10 to 25 % | High compressive strength and a very wide chemical range, including hydrofluoric acid and steam. | Conducts electricity. Can scratch soft counterfaces. | Carbon-filled PTFE |
| Carbon-graphite | 10 to 25 % | Low wear in steam, water and dry running. Kinder to the counterface than glass. | Carries less load than bronze or glass. | Carbon-filled PTFE |
| Graphite | 5 to 15 % | The lowest friction of the filled grades. Gentle on soft shafts and aluminium. | Higher wear. Needs adsorbed moisture or gas, so dry gas and vacuum wear it faster. | Graphite-filled PTFE |
| Bronze | 40 to 60 % | The highest load capacity and heat conduction. Very low creep. | Acids, ammonia, steam and seawater attack bronze. Heavy, and conductive. | Bronze-filled PTFE |
| MoS2, alone or with glass or bronze | 2 to 5 % | Keeps sliding in dry gas, vacuum and cryogenic service, where graphite does not. | Oxidising acids attack MoS2. Alone it adds little strength. | MoS2-filled PTFE |
| Virgin PTFE, the reference | none | The widest chemical range, the cleanest surface, the softest on a counterface. | Creeps and wears quickly under load. | Virgin and modified PTFE |
Hot, loaded and wet
Steam, hot oil, compressor and hot-water duty up to about 260 °C. Carbon, carbon-graphite and bronze grades keep their size and wear slowly. Ask for deformation under load at your own temperature, not at room temperature.
HPHT and cryogenic duty →Cold, dry and loaded
Cryogenic gas, LNG-adjacent and subsea valves down to −200 °C. Glass-MoS2 and MoS2 grades keep sliding when there is no oil or moisture. PTFE shrinks more than metal in the cold, so plan the fit at the cold end.
Cold-end design notes →Application notes
What to specify for common PTFE duties
Short technical notes on the duties we are asked about most. Open one, then start a requirement from it.
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Reading a grade name
The name tells you the polymer, then the filler.
Example: PTFE-GL25-01 is PTFE filled with glass fibre, 25 wt% of the main filler, recipe 01. In conversation it is “PTFE Glass 25”. A lot number adds the year, the month and a batch sequence to the grade, as in PTFE-GL25-01-2610-001.
| Part | Meaning |
|---|---|
| PTFE | The polymer, always first. |
| GL / GM | Glass fibre, or glass fibre with MoS2. |
| CF / CG | Carbon fibre, or carbon-graphite. |
| GR / MS | Graphite, or MoS2. |
| BZ / BM | Bronze, or bronze with MoS2. |
| 25 | Nominal weight percent of the main filler. A second filler is stated on the datasheet. |
| -01 | Recipe number. A new number means a new recipe. |
How a PTFE requirement moves
From a duty to a lot you can trace.
Duty
You state the fluid, temperatures, pressure, speed, counterface and approvals in the requirement builder.
Candidates
We reply by email with one or two fillers, the reasoning, and what to test.
Sample data
Plaques are made and measured against your limits. You receive values, methods and conditions.
Pilot
You run a short pilot on the real counterface, finish and fluid. Results go back into the record.
Lot supply
The agreed grade ships lot by lot with its certificate, and you follow the order in the portal.
PTFE sits inside the wider PFAS discussion. We keep a short briefing on where the rules stand and will tell you if they affect your part. Read the briefing.
Read before you specify
PTFE guides
Twenty-four original articles on properties, processing, wear, seals, gaskets, chemistry and selection. They live in Learn.
Choosing a filled PTFE grade: a decision table
Fluid, counterface, load and approvals, in order.
Read the guide → WearPV limit, wear and friction
How to read a bearing grade and what the numbers depend on.
Read the guide → CreepCreep and cold flow
Why PTFE deforms under load and how fillers and design limit it.
Read the guide → ChemistryChemical resistance matrix
Which fluids attack which filler.
Read the guide → SealsSpring-energised seals
How a PTFE jacket and a metal spring seal where rubber cannot go.
Read the guide → All guidesThe full set of PTFE guides
Properties, processing, standards, gaskets, regulation and more.
See all 24 →Need a filler or a blend that is not listed?
Most PTFE orders start from a requirement, not a catalogue. Give the fluid, temperature, pressure, speed and counterface, and we reply by email.