0.04mm Copper Magnet Wire For Motor Hearing Aid Voice Coils
Diameter Subdivision and Typical Application Examples
- 0.02mm – 0.04mm (20μm – 40μm): The finest level. Commonly used in top-tier hearing aid voice coils, probes for certain miniature medical implants, and ultra-high-density research coils. Extremely difficult to handle, requiring specialized winding equipment.
- 0.05mm – 0.07mm (50μm – 70μm): Mainstream ultra-fine wire range. Widely used in high-end TWS earphone voice coils, miniature inductors, and miniature RF transformers. One of the most critical materials for miniaturization in consumer electronics. 0.08mm –
- 0.09mm (80μm – 90μm): Relatively "thick" fine wire. Used for small speaker voice coils, slightly larger power inductors, small relays, etc., striking a balance between performance and winding efficiency.
Test Items | Requirements | Test Data |
| 1st Sample | 2nd Sample | 3rd Sample |
| Appearance | Smooth & Clean | OK | OK | OK |
| Conductor Diameter | 0.040mm ± | 0.001mm | 0.0400 | 0.0400 | 0.0400 |
| Thickness of Insulation | ≥ 0.006 mm | 0.0090 | 0.0100 | 0.0090 |
| Overall Diameter | ≤ 0.052 mm | 0.0490 | 0.0500 | 0.0490 |
| DC Resistance | ≤ 14.433 Ω/m | 13.799 | 13.793 | 13.785 |
| Elongation | ≥ 11% | 18 | 20 | 19 |
| Breakdown Voltage | ≥325 V | 989 | 1302 | 1176 |
| Pin Hole | ≤ 5 faults/5m | 0 | 0 | 0 |
| Adherence | No cracks visible | OK | OK | OK |
| Cut-through | 230℃ 2min No breakdown | OK | OK | OK |
| Heat Shock | 200±5℃/30min No cracks | OK | OK | OK |
| Solderability | 390± 5℃ 2 Sec No slags | OK | OK | OK |