POM YUNTIANHUA M25
POM YUNTIANHUA M25
POM YUNTIANHUA M25 is medium‑viscosity, standard‑flow copolymer acetal with well‑balanced comprehensive performance. It features high rigidity, high strength, excellent wear‑resistance, good dimensional stability and chemical‑resistance.
Main Applications
Automotive: gears, bearings, auto components, machine‑tool & instrument inner skeleton parts. Electrical & electronic: gears, bearings and structural components for home appliances such as washing‑machine & juicer parts, timer assemblies, keyboard & switch components. Precision mechanical & industrial parts: gears, bearings, cams, screws, levers, pulleys, sprockets, pipe valves and other high‑precision, wear‑resistant, low‑friction structural components. Consumer & others: toys, sports goods, zippers, lighters, buckles and other daily‑use articles.
Physical Properties
| Property Category | Item | Test Standard | Typical Data | Unit |
|---|---|---|---|---|
| Physical Properties | Density | ISO 1183 | 1.41 | g/cm³ |
| Water absorption (23℃,24h) | ISO 62 | 0.60 | % | |
| MFR (190℃/2.16kg) | ISO 1133 | 2.5 | g/10min | |
| Mechanical Properties | Tensile yield strength (23℃) | ISO 527‑2 | 60 | MPa |
| Elongation at break (23℃) | ISO 527‑2 | 40 | % | |
| Tensile modulus (23℃) | ISO 527‑2 | 2550 | MPa | |
| Flexural strength (23℃) | ISO 178 | 81 | MPa | |
| Flexural modulus (23℃) | ISO 178 | 2350 | MPa | |
| Charpy notched impact (23℃) | ISO 179/1eA | 8.0 | kJ/m² | |
| Thermal Properties | HDT (1.8 MPa) | ISO 75‑2/A | 90 | ℃ |
| Others | UL94 rating(1.1 mm) | UL94 | HB | — |
Injection Molding Parameters
| Process Stage | Parameter | Recommended Range | Unit | Remarks |
|---|---|---|---|---|
| Pre‑treatment | Drying temperature | 80‑90 | ℃ | Drying recommended for better dimension & appearance, avoid bubbles/silver streaks despite low moisture absorption |
| Drying time | 3‑4 | h | ||
| Injection | Rear zone | 160‑180 | ℃ | Narrow processing window; strictly avoid＞230℃, formaldehyde gas will be generated by decomposition |
| Middle zone | 170‑200 | ℃ | ||
| Front zone | 190‑210 | ℃ | ||
| Nozzle temperature | 180‑210 | ℃ | Slightly lower or close to front zone to prevent drooling | |
| Melt temperature | 190‑210 | ℃ | Typical range for copolymer POM‑C | |
| Mold temperature | 60‑90 | ℃ | Higher mold temp improves crystallization, dimensional stability, gloss & reduces sink marks |
Note: All information above is for reference only!
