POM DuPont 23P
POM DuPont 23P
POM DuPont 23P is a high‑rigidity homopolymer‑acetal material. It delivers high mechanical strength, good dimensional stability, excellent chemical‑resistance, outstanding wear‑resistance and fatigue‑resistance。
Main Applications
Automotive: skeleton‑type components such as gears, bearings, auto‑parts, machine‑tool and instrument inner parts. Electrical & electronic: gears, bearings and structural parts for home‑appliances such as washing‑machine and juicer timer assemblies. Precision‑machinery & industrial components: high‑precision, wear‑resistant, low‑friction mechanical structural parts including gears, bearings, cams, screws and pulleys. Consumer & others: daily‑use articles such as toys and sports‑equipment。
Physical‑Mechanical‑Thermal Properties
| Property Category | Item | Test Standard | Typical Data | Unit |
|---|---|---|---|---|
| Physical Properties | Specific gravity | ASTM D‑792 / ISO R1183 | 1.42 | — |
| Mechanical Properties | Tensile strength | ASTM D‑638 / ISO R527 | 640 | kg/cm² |
| Elongation at break | ASTM D‑638 / ISO R527 | 35 | % | |
| Flexural modulus | ASTM D‑790 / ISO 178 | 30000 | kg/cm² | |
| Izod notched impact strength | ASTM D‑256 / ISO R180 | 80 | kg/cm² | |
| Thermal Properties | HDT (1.8 MPa) | ASTM D‑648 / ISO 75 | 133 | ℃ |
| HDT (0.46 MPa) | ASTM D‑648 / ISO 75 | 168 | ℃ | |
| Melting point | ASTM D‑3418 | 175 | ℃ |
Injection Molding Parameters
| Process Stage | Parameter | Recommended Range | Unit | Remarks |
|---|---|---|---|---|
| Pre‑drying | Drying requirement | Normally not required | — | Low moisture absorption; pre‑heating around 80 ℃ is beneficial for dimensional stability. |
| Barrel temperature | Barrel temperature | 170‑200 | ℃ | Homopolymer POM has narrow processing window; do not exceed 220 ℃, otherwise irritant formaldehyde gas will be generated by decomposition. |
| Melt temperature | 190‑210 | ℃ | ||
| Mold temperature | 80‑100 | ℃ | Higher mold temperature improves crystallization, dimensional stability, surface gloss and reduces sink marks. | |
| Injection parameters | Injection pressure | Medium | — | Recommended processing strategy: medium pressure, medium speed, low melt temperature, high mold temperature. |
| Hold‑up pressure | High (close to injection pressure) | — | Sufficient hold‑pressure to reduce pressure drop and sink marks. | |
| Screw speed | Not excessively high | rpm | Avoid excessive shear heat; keep small cushion to prevent thermal degradation. | |
| Barrel residence time | As short as possible | min | Prolonged residence at processing temperature will cause material degradation. |
Note: All data above is for reference only！
