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PEEK
ISO N (non-ferrous)Some makers: ISO O (other (outside the six ISO groups))Tool makers differ on the ISO workpiece group: MAPAL (machining group N4-1 "thermoplastics" under symbol N of DIN ISO 513, with PA and PE given as examples. The name PEEK appears only as an example in the composites group C1-3): N[4]; Sandvik Coromant: O (Thermoplastics and thermosets are grouped under O (Other, outside ISO))[5]. Choose insert grades and data according to the maker of the tool you use.
Polyether ether ketone (semi-crystalline super engineering plastic; PAEK family). Standard: ISO 23153-1 (designation of molding and extrusion materials), ASTM D8033 (classification of molding and extrusion materials), ASTM D6262 (PAEK shapes).
📄Related standards (ISO, ASTM, JIS)
Standards that define the material or stock shapes. Standard texts are paid, so only titles and scopes checked on public pages are shown.
| Spec | Scope | Confidence |
|---|---|---|
| ISO 23153-1:2020 | Plastics — Polyetheretherketone (PEEK) moulding and extrusion materials — Part 1: Designation system and basis for specificationsDesignation of PEEK molding and extrusion materials (the body text of the iso.org page could not be retrieved; confirmed from search results) | One source / reference[8] |
| ASTM D8033-22 | Standard Classification System for Poly(Ether Ether Ketone) (PEEK) Molding and Extrusion MaterialsClassification of PEEK materials for injection molding and extrusion | Agrees in 2+ sources[9] |
| ASTM D6262-23 | Standard Specification for Extruded, Compression Molded, and Injection Molded Basic Shapes of Poly(aryl ether ketone) (PAEK)Requirements for PAEK (including PEEK) sheet, rod and round tube. Grade 1 is 100% virgin resin | Agrees in 2+ sources[10] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
📋Typical properties
Plastic properties vary with maker, grade and processing. These are makers’ published typical values, not guaranteed values. For design, check the data sheet of the grade you use.
| Property | Value | Test method | Source of value |
|---|---|---|---|
| Tensile strength | 115–116 MPa | ISO 527-1/-2 (Ensinger: DIN EN ISO 527-2, 50 mm/min) | Typical value (machined stock. MCAM Ketron 1000 PEEK is 115; Ensinger TECAPEEK natural is 116. The MCAM ASTM D638 value is 16,000 psi) Agrees in 2+ sources[1][2] |
| Tensile strength | 98.0 MPa | ISO 527-2 (yield stress, 23°C) | Typical value (resin maker Victrex PEEK 450G. This is a molded-part value, not a machined-stock value) One source / reference[3] |
| Flexural modulus | 4200 MPa | DIN EN ISO 178 (2mm/min) | Typical value (Ensinger TECAPEEK natural) One source / reference[2] |
| Flexural modulus | 3800 MPa | ISO 178 | Typical value (Victrex PEEK 450G, molded part) One source / reference[3] |
| Rockwell hardness | M105 Rockwell M scale | ISO 2039-2 (the ASTM D785 values are M100, R126) | Typical value (MCAM Ketron 1000 PEEK) One source / reference[1] |
| Durometer hardness (Shore D) | 89 Shore D | DIN EN ISO 868 | Typical value (Ensinger TECAPEEK natural) One source / reference[2] |
| Durometer hardness (Shore D) | 84.5 Shore D | Value from the Victrex document (test method not yet confirmed) | Typical value (Victrex PEEK 450G, molded part) One source / reference[3] |
| Deflection temperature under load (1.8 MPa) | 160–162 ℃ | ISO 75 Method A | Typical value (machined stock. MCAM Ketron 1000 PEEK is 160; Ensinger TECAPEEK natural is 162. The MCAM ASTM D648 value is 320°F) Agrees in 2+ sources[1][2] |
| Deflection temperature under load (1.8 MPa) | 152 ℃ | ISO 75-2/Af (unannealed) | Typical value (Victrex PEEK 450G, molded part) One source / reference[3] |
| Continuous use temperature (guideline) | 250 ℃ | Temperature at which tensile strength falls to about 50% after 20,000 hours in air (MCAM's definition) | Typical value (MCAM Ketron 1000 PEEK) One source / reference[1] |
| Continuous use temperature (guideline) | 260 ℃ | Long-term use temperature (Ensinger. Test conditions not stated) | Typical value (Ensinger TECAPEEK natural. Short-term is 300°C) One source / reference[2] |
| Continuous use temperature (guideline) | 260 (electrical) / 240 (strength) / 180 (impact) ℃ | UL 746B relative thermal index (RTI) | Typical value (Victrex PEEK 450G) One source / reference[3] |
| Coefficient of linear thermal expansion | 5 (23–100℃) ×10⁻⁵/K | Ensinger: DIN EN ISO 11359-1;2 (longitudinal direction). MCAM: 50, in the document's units of µm/(m·K) | Typical value (Ensinger TECAPEEK natural, MCAM Ketron 1000 PEEK. Ensinger also gives 5 at 23–60°C and 7 at 100–150°C. MCAM gives 5.5 at 23–150°C and 13 above 150°C) Agrees in 2+ sources[2][1] |
| Coefficient of linear thermal expansion | 4.5 (below 143°C) / 12 (above 143°C) ×10⁻⁵/K | ISO 11359-2 (flow direction. The document's units are ppm/K; 45/120) | Typical value (Victrex PEEK 450G, molded part) One source / reference[3] |
| Water absorption (23°C water, 24 h) | 0.06 % | ISO 62 (φ50 × 3 mm disk. The ASTM D570 value is 0.10) | Typical value (MCAM Ketron 1000 PEEK) One source / reference[1] |
| Water absorption (23°C water, 24 h) | 0.02–0.03 (24h / 96h) % | DIN EN ISO 62 | Typical value (Ensinger TECAPEEK natural. Given as the 24 h and 96 h values side by side) One source / reference[2] |
| Water absorption (23°C water, saturation) | 0.45 % | ISO 62 | Typical value (Victrex PEEK 450G, MCAM Ketron 1000 PEEK. The MCAM ASTM D570 value is 0.5) Agrees in 2+ sources[3][1] |
| Melting point | 340–343 ℃ | ISO 11357 (DSC) | Typical value (MCAM Ketron 1000 PEEK is 340; Ensinger TECAPEEK natural is 341; Victrex PEEK 450G is 343) Agrees in 2+ sources[1][2][3] |
| Glass transition temperature | 143 (onset) / 150 (midpoint) ℃ | ISO 11357-2 | Typical value (Victrex PEEK 450G. Ensinger TECAPEEK natural also gives 150) Agrees in 2+ sources[3][2] |
⚖Density
1.31 g/cm³
MCAM Ketron 1000 PEEK (ISO 1183-1) and Ensinger TECAPEEK natural give 1.31. Victrex PEEK 450G gives 1.30 in the crystallized state (ISO 1183)
Calculate weight in PEEK →🏷Common trade names (makers)
Plastics are often called by a maker’s product name. Names are trademarks of their owners.
- VICTREX PEEK 450G (Victrex)Resin (pellets for molding and extrusion). The document writes VICTREX™ PEEK POLYMER 450G™[3]
- Ketron 1000 PEEK (Mitsubishi Chemical Advanced Materials (MCAM))Ketron is a trademark of Mitsubishi Chemical Advanced Materials (the document says "protected trademark")[1]
- TECAPEEK (Ensinger)Ensinger product name[2]
🔧Machinability notes (as stated in the sources)
- Victrex recommended cutting conditions (unfilled): Turning: cutting speed 100–300 m/min, feed 0.1–0.7 mm/rev, clearance angle 5–15°, positive rake angle 5–15°, depth of cut 1–6.5 mm, dry or with water-soluble or oil-based coolant. Milling: 180–230 m/min with carbide. Drilling: 120 m/min, feed 0.05–0.20 mm/rev, point angle 118°, clearance angle 12°[6]
- MCAM cutting guide (Ketron 1000 PEEK column): Turning: clearance angle 5–15°, rake angle 0–10°, feed 0.05–0.5 mm/rev, 200–400 m/min (carbide). Milling: feed up to 0.4 mm/tooth, 150–300 m/min. Drilling: point angle 90–120°, feed 0.1–0.3 mm/rev, 50–80 m/min (carbide)[7]
- Its modulus is lower than that of metals, so strong clamping easily causes warping and distortion. Leave stock evenly and as symmetrically as possible. Low thermal conductivity traps heat, so either water-soluble or oil-based coolant can be used (Victrex)[6]
- Machining can introduce stress or release residual stress, so annealing may be needed before or during machining. For parts with heavy material removal, anneal again before final finishing (Victrex)[6]
- Victrex annealing: heat uniformly to 200°C, hold 1 hour per mm of wall thickness, cool at 10°C/h to below 140°C. For stress relief, the hold temperature goes up to 250°C. For dimensional stability, hold at 20°C or more above the maximum service temperature, before final finishing[6]
- MCAM annealing: for PEEK, hold temperature 250°C, heating rate 10–20°C/h, hold 10 min per mm of wall thickness, cooling 5–10°C/h, in air or nitrogen (MCAM)[7]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- mcam.com https://www.mcam.com/mam/54294/AEP-Ketron%E2%84%A2%201000%20PEEK_en_US.pdf
- ensingerplastics.com https://www.ensingerplastics.com/en/shapes/peek-tecapeek-natural
- victrex.com https://www.victrex.com/en/downloads/datasheets/victrex-peek-450g
- mapal.com https://mapal.com/medias/sys_master/root/hea/hd5/10787307716638/MMG-2025__EN/MMG-2025-EN.p…
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- cdn.victrex.com https://cdn.victrex.com/-/media/downloads/technical-guides/victrex_finishing-brochure_jan2…
- mcam.com https://www.mcam.com/mam/41701/MCG-Machinist-Toolkit-A4-EU-metric.pdf
- iso.org https://www.iso.org/standard/74746.html
- store.astm.org https://store.astm.org/d8033-22.html
- store.astm.org https://store.astm.org/d6262-23.html
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