Filament (FDM)
PEKK 3D printing
PEKK (polyether ketone ketone) is a high-performance polymer of the same family as PEEK (PAEK). We print it in Brescia with high-temperature FDM, unfilled or carbon-fiber-filled.
What it is for
PEKK is used in the same fields as PEEK: light structural parts, brackets, ducts, insulators and components that work in heat and in contact with fuels, oils and solvents. The PEKK-A grade crystallizes slowly: it prints with less shrinkage and less warping than PEEK, which helps on large parts or thick walls.
As printed it is largely amorphous: to use its heat resistance it needs annealing, which the maker recommends. Do not choose it if simpler materials are enough: for chemicals alone PPS, for heat without high loads Ultem. For parts subject to wear also consider PEEK.
Variants compared
| Property | PEKK-AQuote | PEKK-A-CF (15% carbon fiber)Quote |
|---|---|---|
| Mechanical | ||
| Tensile strengthISO 527 | 105 MPaprinted specimen, XY flat | 126 MPaprinted specimen, XY flat, at break |
| Tensile modulusISO 527, printed specimen, XY flat | 2,750 MPa | 9,125 MPa |
| Elongation at breakISO 527 | 5%printed specimen, XY flat | 3.15%printed specimen, XY flat, at break |
| Flexural strengthISO 178, printed specimen, XY flat | 95 MPa | 178 MPa |
| Flexural modulusISO 178, printed specimen, XY flat | 2,680 MPa | 8,817 MPa |
| Thermal | ||
| Heat deflection temperature (HDT) at 0.45 MPaISO 75 | 150 °Cprinted specimen, XY flat, the sheet also labels it max use temperature | 285 °Cprinted specimen, XY flat |
| Glass transition (Tg)DSC | 162 °C | 165 °C |
| Melting point (Tm)DSC | 305 °C | 305 °C |
| Physical | ||
| DensityISO 1183 | 1.27 g/cm³ | 1.33 g/cm³ |
| Fire behavior | ||
| Flammability ratingUL 94, base resin, not the printed part | V-0 at 0.8 mm | on request |
| Source |
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Typical values from the makers' data sheets, measured on specimens under the conditions stated. They are not guaranteed design values: for a critical application ask us for a test on your part.
Treatments after printing
For PEKK-A the maker highly recommends annealing. The values in the table are the sheet's, which gives no figures after annealing.
Annealing and filament drying are done in a Memmert oven at a controlled temperature.
Design limits
- Build volume
- 350 × 350 × 450 mm
- Minimum wall
- 3 mm
- Dimensional tolerance
- ±0.6 mm up to 100 mm, ±0.75% above
These are the limits of the process, the same for every variant unless stated. For critical dimensions, talk to us before printing.
Which variant to choose
- PEKK-A: unfilled and electrically insulating. Specimens printed flat: tensile strength 105 MPa, modulus 2750 MPa, elongation at break 5% (ISO 527); heat deflection temperature 150 °C at 0.45 MPa (ISO 75), glass transition 162 °C. For insulators, ducts and covers.
- PEKK-A-CF (15% carbon fiber): stiffer and stronger: tensile strength at break 126 MPa, modulus 9125 MPa, elongation at break 3.15%; heat deflection temperature 285 °C at 0.45 MPa. For brackets and structural parts in heat.
FAQ
Frequently asked questions
Do you have a part to print in PEKK?
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