Printed from Kezuriba (kezuriba.net/en/materials/pom-h/)
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). Higher crystallinity than the copolymer. 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[7] |
| 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[8] |
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 | 78–79 MPa | ISO 527-1/-2 (Ensinger: DIN EN ISO 527-2, 50 mm/min) | Typical value (MCAM Acetron POM-H/Ertacetal H is 78; Ensinger TECAFORM AD natural is 79. The MCAM ASTM D638 value is 11,000 psi) Agrees in 2+ sources[1][2] |
| Flexural modulus | 3600 MPa | DIN EN ISO 178 (2mm/min) | Typical value (Ensinger TECAFORM AD natural) One source / reference[2] |
| Flexural modulus | 3450 MPa | ISO 178 | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Rockwell hardness | M88 Rockwell M scale | ISO 2039-2 (the ASTM D785 value is M89) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Durometer hardness (Shore D) | 85 Shore D | DIN EN ISO 868 | Typical value (Ensinger TECAFORM AD natural) One source / reference[2] |
| Durometer hardness (Shore D) | 81 Shore D | ISO 868 (the ASTM D2240 value is 86) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Deflection temperature under load (1.8 MPa) | 110 ℃ | ISO 75-1/-2 Method A (the ASTM D648 value is 250°F) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Continuous use temperature (guideline) | 90 ℃ | Temperature at which tensile strength falls to about 50% after 20,000 hours in air (MCAM's definition) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Continuous use temperature (guideline) | 110 ℃ | Long-term use temperature (Ensinger. Test conditions not stated) | Typical value (Ensinger TECAFORM AD natural. Short-term is 150°C) One source / reference[2] |
| Coefficient of linear thermal expansion | 12 (23–60℃) / 13 (23–100℃) ×10⁻⁵/K | DIN EN ISO 11359-1;2 (longitudinal direction) | Typical value (Ensinger TECAFORM AD natural) One source / reference[2] |
| Coefficient of linear thermal expansion | 9.5 (23–60℃) / 11 (23–100℃) ×10⁻⁵/K | MCAM (units in the document are µm/(m·K); 95/110) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Water absorption (23°C water, 24 h) | 0.21 % | ISO 62 (φ50 × 3 mm disk. The ASTM D570 value is 0.20) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Water absorption (23°C water, 24 h) | 0.05 % | DIN EN ISO 62 (96 h is 0.1) | Typical value (Ensinger TECAFORM AD natural) One source / reference[2] |
| Water absorption (23°C water, saturation) | 0.80 % | MCAM (the ASTM D570 value is 0.9) | Typical value (MCAM Acetron POM-H/Ertacetal H) One source / reference[1] |
| Melting point | 180–182 ℃ | ISO 11357 (DSC) | Typical value (MCAM Acetron POM-H/Ertacetal H is 180; Ensinger TECAFORM AD natural is 182) Agrees in 2+ sources[1][2] |
⚖Density
1.43 g/cm³
MCAM (ISO 1183-1) and Ensinger give 1.43. The MCAM ASTM D792 column (specific gravity) is 1.41
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 POM-H / Ertacetal H (Mitsubishi Chemical Advanced Materials (MCAM))Acetron and Ertacetal are trademarks of Mitsubishi Chemical Advanced Materials (the document says "protected trademark")[1]
- TECAFORM AD (Ensinger)Ensinger product name. Ensinger explains that it is made from white DuPont Delrin resin (the US page also lists DELRIN® 150 Series). The current trademark owner of Delrin was not confirmed in primary sources[2][9]
🔧Machinability notes (as stated in the sources)
- MCAM cutting guide (Ertacetal POM column; shared with POM-C): Turning: clearance angle 5–15°, rake angle 0–10°, feed 0.05–0.5 mm/rev, cutting speed 200–500 m/min. 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[6]
- MCAM explains that POM-H has higher mechanical strength, stiffness, hardness and creep resistance than the copolymer, and much lower thermal expansion (suited to small-diameter, thin-wall bushings, gears, valve parts, etc.). Ensinger also explains that its higher crystallinity gives slightly higher density, hardness and strength[1][2]
- Annealing (stress relief): for POM-H, hold temperature 155°C (140°C for PTFE-filled POM H-TF), heating rate 10–20°C/h, hold 10 min per mm of wall thickness, cooling 5–10°C/h (MCAM)[6]
- Coolant is unnecessary for most operations (except drilling and parting off). Holes shrink after machining and turned diameters tend to grow, so take care in aiming for dimensions (MCAM)[6]
📚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/54386/GEP-Ertacetal%E2%84%A2%20H%20POM-H_en_US.pdf
- ensingerplastics.com https://ensingerplastics.com/en/shapes/acetal-tecaform-ad-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
- 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
- ensingerplastics.com https://www.ensingerplastics.com/en-us/shapes/acetal-tecaform-ad-natural-
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