Material
PEEK Filament
High-performance polymer filament
Choose PEEK Filament based on its stiffness, recovery, wear, wet-service, chemical, and temperature behavior. For brush stiffness, do not give only the material name. Filament diameter, free trim, density, grade, and service conditions must be specified together.
Datasheet values
- Density
- 1.29–1.32 g/cm³
- Melting point
- 343°C
- Water absorption
- about 0.1%
- Continuous service
- up to 250°C
- Filament diameter
- 0.10–1.20 mm
PEEK is a high-performance thermoplastic with strong chemical and thermal capability, but published resin limits do not automatically become brush assembly limits.
What is PEEK Filament, and what makes it different from other brush filaments?
In the high-performance polymer filament family, PEEK Filament is specified, supplied as filament, drawn in round, rectangular and hollow sections and set in straight rows, helical, staggered and zoned fill patterns.
PEEK Filament is used in custom cleaning brushes for high-temperature process, electronics and chemically demanding specialty brushes where ordinary polymers lose strength.
It is usually weighed against PBT, PTFE Filament and Nylon PA, and the deciding difference is moisture uptake and working temperature rather than anything you can read off the name.
Compare PEEK Filament with PBT, PTFE, Nylon. Change material when wet stiffness, temperature, chemical resistance, conductivity, particle shedding, or surface marking becomes the limiting factor.
What stiffness and contact pressure can I expect from PEEK Filament?
PEEK Filament is firm; Shore D about 85-90; high-performance monofilament for heat and chemical exposure. Use finer filament and longer trim for conformable contact; use coarser filament, shorter trim, or higher density for stronger displacement or cutting.
Filament-level figures for this grade and the ones it is usually compared to. The brush built from it is rated lower: the anchoring and the adhesive give out before the filament does.
| Property | PEEK Filament | PBT | PTFE Filament | Nylon PA |
|---|---|---|---|---|
| Shore hardness | Shore D 85–90 | Shore D 80–90 | Shore D 50–65 | Medium to firm; filament diameter and trim length control bending force. |
| Continuous temperature (°C) | 250–260 | 120–140 | 260 | 93 |
| Peak temperature (°C) | 300 | 160–180 | 300 | 121 |
| Water absorption, 24 h | 0.10–0.50% (24h, ISO 62/ASTM D570) | 0.05–0.20% (24h, ISO 62/ASTM D570) | ≤0.01% (24h, ISO 62/ASTM D570) | 0.3–9% by PA grade and conditioning |
| Filament diameter (mm) | 0.05–1.50 | 0.03–2.00 | 0.05–2.00 | 0.08–2.50 |
| Flexibility | Low to Medium Flexibility | Medium to High Flexibility | Low to Medium Flexibility | Medium to High Flexibility |
The part people get wrong: the same grade can feel soft or aggressive depending on diameter, trim and density. Specify that geometry before the material, or the sample will surprise you.
How does water affect PEEK Filament performance?
PEEK Filament takes up 0.10–0.50% (24h, ISO 62/ASTM D570).
Very low water absorption and stable wet performance.
What this means for your application: moisture uptake is low enough to ignore in service, which is why this grade holds its stiffness through washdown.
A practical check: run one wet cycle and compare tip contact against the dry state. If the wet brush leaves residue behind or no longer reaches the bottom of the bore, change the material rather than the geometry.
What temperature limits apply to PEEK Filament?
Continuous service: 250–260°C.
The filament tables quote 250–260°C continuous and 300°C peak. The tighter number above is the one to build to, because a brush is loaded while it is hot.
The melting point of 343°C is not a service limit and should never be used to set a wash temperature. It is the point at which the filament stops being a solid at all.
Where it stops working: A permanent bend under load means the answer is a higher-temperature filament family, not a heavier trim.
Diameter, trim length and applied load all shift the real limit, so a thin filament touching lightly survives conditions that would flatten a thick one under pressure.
What chemicals attack PEEK Filament?
Excellent resistance to acids, alkalis, oils, fuels and cleaning solvents.
Compatibility is a function of concentration, temperature and contact time together. A short rinse in a dilute solution is a different exposure from an overnight soak in a concentrated one, even with the same chemical on the label.
Before you commit to a quantity: Specify the exact PEEK Filament grade or alloy, filament or profile size, color, straight or crimped form, working temperature, wet or dry use, chemical exposure, surface finish, and any required material documentation.
What is the practical lower limit for filament diameter?
The floor is roughly 0.05 mm; finer than that and the filament snaps rather than flexes. In practice you are choosing inside 0.05–1.50 mm.
Free trim runs 3–150 mm, and the two interact: a finer filament needs a shorter trim to keep useful stiffness, while a thicker one carries a longer trim and still lands pressure on the tip.
Split the range by duty: roughly 0.05–0.41 mm for light wiping, dusting and surfaces that mark easily, and 0.41–1.50 mm where residue is packed on and point pressure matters more than surface risk.
Tip treatments available on this filament: end rounding, plasma treatment and carbon-fiber conductive modification.
In practical brush terms: reaching deep into a bore or crevice is a diameter problem before it is a length problem. A thicker filament on a moderate trim pushes further in before the tips fold over.
What applications typically use PEEK Filament?
High-temperature process, electronics and chemically demanding specialty brushes where ordinary polymers lose strength.
Where it turns up in practice:
- Connector & Slot Cleaning
- PCB Cleaning
- Printer & Scanner Cleaning
- 3D Printer Nozzle Cleaning
- Semiconductor Wafer & Chip Cleaning
- Industrial Machine Cleaning
It is normally set into these constructions:
- Custom Roller and Conveyor Brushes
- Custom Handheld Detail Brushes
The trade-off: Not needed for low-cost general cleaning where PP/Nylon is sufficient.
How do I specify PEEK Filament for a custom brush?
Send the brush type, filament diameter, free trim length, density, contact setting, wet or dry duty, working temperature and the actual cleaning chemistry together. Any one of them on its own leaves the stiffness undefined.
What usually goes wrong at this step:
- Selecting PEEK Filament from the material name alone without setting filament diameter, trim length, and density
- Using dry stiffness to predict wet behavior without checking moisture absorption or liquid exposure
- Ignoring trapped abrasive particles, chemical concentration, temperature, or contact motion when assessing surface risk
Reference standards behind the figures on this page: ISO 527-1:2019; ASTM D638; ISO 62:2008; ASTM D570-22; ISO 868:2003; ASTM D2240-15(2021); ISO 4892-3:2024; ASTM G154-23; UL 94.
Source: Ensinger — PEEK Material Properties. Public manufacturer or material data supports the material form and performance direction used on this page.
What else does the datasheet specify for PEEK Filament?
| Filament cross-section | Round/Rectangular/Hollow |
|---|---|
| Electrical behaviour | Insulating; Carbon-Fiber / Carbon-Black Filled Grades Can Reach 10^2–10^8 Ω |
Questions this page is asked
What should a loaded thermal-cycle test verify for a PEEK brush?
Cycle the finished brush between its specified temperatures while the trim carries representative deflection, speed and dwell, then measure contact force, permanent set, recovery, wear, cracking and anchor retention. Use the complete assembly and its actual atmosphere or fluid, because a resin property measured by another method does not establish continuous brush performance or the limits of the base and joint.
What extra evidence is needed for PEEK brushes in purity-sensitive processing?
Define the contaminants of concern and test the identified filament and assembled brush for the applicable extractables, ions, metals, particles, outgassing, shedding or cleaning residues under the actual chemical and thermal cycle. A broad PEEK chemical-resistance claim does not establish semiconductor, cleanroom or other purity acceptance unless the grade, processing history, adjacent materials and test method are all within scope.
Where these figures come from
| Property | Published value | Source |
|---|---|---|
| Chemical resistance | Excellent resistance to acids, alkalis, oils, fuels and cleaning solvents. | Perlon Retrieved 2026-07-20 |
| Published datasheet figures |
|
Victrex Retrieved 2026-07-20 |
| Hardness and stiffness | Firm; Shore D about 85-90; high-performance monofilament for heat and chemical exposure. | Perlon Retrieved 2026-07-20 |
| Limitations | Not needed for low-cost general cleaning where PP/Nylon is sufficient. | Perlon Retrieved 2026-07-20 |
| Temperature resistance | Continuous service: 250–260°C. | Victrex Retrieved 2026-07-20 |
| Water resistance | Very low water absorption and stable wet performance. | Victrex Retrieved 2026-07-20 |
Guides that go deeper on this
We have not written a guide specific to this one yet. The material that covers selection, filament, dimensions, maintenance and sourcing is collected in the technical resources library.
No catalogue item for this yet
Every brush here is made to order, and this one has no catalogue entry so far. Send the working surface, the residue, the access opening and the quantity, and it is quoted through the same specification route as the rest of the range.
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