Printed from Kezuriba (kezuriba.net/en/materials/pom-c/)
POM
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. POM is not named): 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.
Polyacetal (semi-crystalline general-purpose engineering plastic). Standard: ISO 29988-1, JIS K 7364-1 (designation of molding and extrusion materials), ASTM D6100 (POM 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 29988-1:2019 | Plastics — Polyoxymethylene (POM) moulding and extrusion materials — Part 1: Designation system and basis for specificationsDesignation of POM homopolymer, copolymer and blend 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 D6100-25 | Standard Specification for Extruded, Compression Molded and Injection Molded Polyoxymethylene Shapes (POM)Requirements for POM sheet, rod and round tube (extruded, compression molded, injection molded). Includes filled grades | Agrees in 2+ sources[3] |
| JIS K 7364-1:2004 | Standard for polyoxymethylene molding and extrusion materials (body text not confirmed) | One source / reference[9] |
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 | 66–67 MPa | ISO 527-1/-2 (Ensinger: DIN EN ISO 527-2, 50 mm/min) | Typical value (MCAM Acetron GP/Ertacetal C is 66; Ensinger TECAFORM AH natural is 67. The ASTM D638 value for both MCAM and Röchling Sustarin C is 9,500 psi) Agrees in 2+ sources[1][2] |
| Flexural modulus | 2600–2660 MPa | ISO 178 (Ensinger: DIN EN ISO 178, 2 mm/min) | Typical value (Ensinger TECAFORM AH natural is 2600; MCAM Acetron GP/Ertacetal C is 2660) Agrees in 2+ sources[2][1] |
| Rockwell hardness | M88 Rockwell M scale | ASTM D785 | Typical value (ASTM column of MCAM Acetron GP/Ertacetal C, ASTM document of Röchling Sustarin C) Agrees in 2+ sources[1][6] |
| Rockwell hardness | M84 Rockwell M scale | ISO 2039-2 (10 mm thick specimen) | Typical value (ISO column of MCAM Acetron GP/Ertacetal C) One source / reference[1] |
| Durometer hardness (Shore D) | 82 Shore D | DIN EN ISO 868 | Typical value (Ensinger TECAFORM AH natural) One source / reference[2] |
| Durometer hardness (Shore D) | 85 Shore D | ASTM D2240 | Typical value (ASTM document of Röchling Sustarin C) One source / reference[6] |
| Deflection temperature under load (1.8 MPa) | 100 ℃ | ISO 75-1/-2 Method A | Typical value (MCAM Acetron GP/Ertacetal C) One source / reference[1] |
| Deflection temperature under load (1.8 MPa) | 220–225 °F | ASTM D648 (264 psi) | Typical value (MCAM Acetron GP/Ertacetal C is 220; Röchling Sustarin C is 225) Agrees in 2+ sources[1][6] |
| Continuous use temperature (guideline) | 100 ℃ | MCAM: temperature at which tensile strength falls to about 50% after 20,000 hours in air. Ensinger: long-term use temperature (conditions not stated) | Typical value (MCAM Acetron GP/Ertacetal C, Ensinger TECAFORM AH natural. Ensinger's short-term value is 140°C; Röchling's ASTM document gives 180°F) Agrees in 2+ sources[1][2] |
| Coefficient of linear thermal expansion | 13 (23–60℃) / 14 (23–100℃) ×10⁻⁵/K | DIN EN ISO 11359-1;2 (longitudinal direction) | Typical value (Ensinger TECAFORM AH natural) One source / reference[2] |
| Coefficient of linear thermal expansion | 12.5 (23–100℃) ×10⁻⁵/K | MCAM (units in the document are µm/(m·K); 125) | Typical value (MCAM Acetron GP/Ertacetal C) One source / reference[1] |
| Water absorption (23°C water, 24 h) | 0.2 % | ASTM D570 | Typical value (MCAM Acetron GP/Ertacetal C is 0.20; Röchling Sustarin C is 0.2) Agrees in 2+ sources[1][6] |
| Water absorption (23°C water, 24 h) | 0.24 % | ISO 62 (φ50 × 3 mm disk) | Typical value (ISO column of MCAM Acetron GP/Ertacetal C) One source / reference[1] |
| Water absorption (23°C water, 24 h) | 0.05–0.1 (24h / 96h) % | DIN EN ISO 62 | Typical value (Ensinger TECAFORM AH natural. Given as the 24 h and 96 h values side by side) One source / reference[2] |
| Water absorption (23°C water, saturation) | 0.8–0.9 % | MCAM: ISO column 0.80, ASTM D570 column 0.9. Röchling: ASTM D570 | Typical value (MCAM Acetron GP/Ertacetal C, Röchling Sustarin C is 0.9) Agrees in 2+ sources[1][6] |
| Melting point | 165–166 ℃ | ISO 11357 (DSC) | Typical value (MCAM Acetron GP/Ertacetal C is 165; Ensinger TECAFORM AH natural is 166. Röchling's ASTM document gives 330°F) Agrees in 2+ sources[1][2] |
⚖Density
1.41 g/cm³
MCAM (1.41 in both ISO 1183-1 and ASTM D792), Ensinger and Röchling (ASTM D792) agree
Calculate weight in POM →🏷Common trade names (makers)
Plastics are often called by a maker’s product name. Names are trademarks of their owners.
- Acetron GP / Ertacetal C (Mitsubishi Chemical Advanced Materials (MCAM))Acetron and Ertacetal are trademarks of Mitsubishi Chemical Advanced Materials (the document says "protected trademark")[1]
- TECAFORM AH (Ensinger)Ensinger product name[2]
- Sustarin C (Röchling)Röchling product name (the page writes it as Sustarin®)[6]
- DURACON POM (Polyplastics)Molding material (resin). The product page title is DURACON® POM. The current product page redirects to the Daicel site, and values could not be obtained[10]
🔧Machinability notes (as stated in the sources)
- MCAM cutting guide (Ertacetal POM column): Turning: clearance angle 5–15°, rake angle 0–10°, feed 0.05–0.5 mm/rev, cutting speed 200–500 m/min (HSS or carbide). Milling: feed up to 0.5 mm/tooth, 200–400 m/min. Drilling: clearance angle 5–10°, rake angle 3–5°, point angle 90–120°, feed 0.1–0.3 mm/rev, 50–100 m/min[7]
- One reason POM-C is chosen is that it has no internal voids (porosity) (MCAM writes porosity-free; Ensinger writes porosity free)[1][2]
- Coolant is unnecessary for most operations (except drilling and parting off). When finish and dimensional accuracy matter, use a water-soluble coolant without aromatics. Letting the part rest 24 hours after roughing tends to stabilize dimensions. Climb milling (down-cut milling) is recommended (MCAM)[7]
- Annealing (stress relief): for both POM-C and POM-H, hold temperature 155°C, heating rate 10–20°C/h, hold 10 min per mm of wall thickness, cooling 5–10°C/h. In air, nitrogen or oil (MCAM)[7]
- In MCAM's table of achievable tolerances, the best tolerance (mm) for PA and POM is 0.03 at 10 mm, 0.09 at 100 mm and 0.15 at 200 mm. It notes that special tools or processes may be needed, which can raise cost[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/63654/GEP-Ertacetal%E2%84%A2%20C%20POM-C_en_US.pdf
- ensingerplastics.com https://www.ensingerplastics.com/en/shapes/acetal-tecaform-ah-natural
- store.astm.org https://store.astm.org/d6100-25.html
- 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
- roechling.com https://www.roechling.com/us/industrial/materials/thermoplastics/engineering-plastics/pom-…
- mcam.com https://www.mcam.com/mam/41701/MCG-Machinist-Toolkit-A4-EU-metric.pdf
- iso.org https://www.iso.org/standard/77532.html
- webdesk.jsa.or.jp https://webdesk.jsa.or.jp/link/lib/jis2025/index/319111.pdf
- polyplastics-global.com https://www.polyplastics-global.com/en/product/duracon.html
Other materials
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