Q what is plastic injection magnet? What’s the difference between the grades of plastic injection magnets?
Answer
The plastic injection magnet is made of ferrite magnetic powder, plastic (mainly nylon) and additives. The permanent magnet made by injection molding has the unique advantages of high precision and not easy to break.
The following table shows the magneto gas characteristics of the plastic injection magnet:
| Characteristic | Residual magnetic beam density Br | Magnetic retention bHc | Internal magnetic force iHc | Maximum magnetic energy product (BH)max | Remarks | ||||
| Grade | Gauss | mT | Oe | KA/m | Oe | KA/m | MGOe | KJ/m3 | Plastic material |
| PM-F63K | 2450 | 245 | 2250 | 179 | 2960 | 235 | 1.49 | 11.90 | Nylon 6 (PA 6) |
| PM-F65K | 2670 | 267 | 2320 | 185 | 2970 | 236 | 1.78 | 14.10 | |
| PM-63N | 2750 | 275 | 2360 | 188 | 2920 | 232 | 1.88 | 14.90 | |
| PM-F66 | 2780 | 278 | 2340 | 186 | 2850 | 227 | 1.92 | 15.30 | |
| PM-F67 | 2900 | 290 | 2400 | 191 | 2930 | 233 | 2.08 | 16.50 | |
| PM-S68 | 2920 | 292 | 2380 | 189 | 2840 | 226 | 2.10 | 16.70 | |
| PM-S58 | 2970 | 297 | 2280 | 181 | 2450 | 195 | 2.15 | 17.10 | |
| PM-201 | 2100 | 210 | 2030 | 162 | 3190 | 254 | 1.09 | 8.70 | Nylon 12 (PA 12) |
| PM-F21 | 2340 | 234 | 2170 | 173 | 3000 | 239 | 1.36 | 10.80 | |
| PM-N24 | 2550 | 255 | 2410 | 192 | 3530 | 281 | 1.62 | 12.90 | |
| PM-N25 | 2680 | 268 | 2480 | 197 | 3450 | 274 | 1.83 | 14.60 | |
| PM-F26S | 2800 | 280 | 2330 | 185 | 2810 | 224 | 1.94 | 15.50 | |
| PM-A27E | 2860 | 286 | 2370 | 189 | 2940 | 234 | 2.02 | 16.00 | |
| PM-A27N | 2910 | 291 | 2350 | 187 | 2810 | 224 | 2.09 | 16.60 | |
| PM-A27EP | 2850 | 285 | 2365 | 188 | 2990 | 238 | 2.01 | 15.90 | |
| PM-164M | 2650 | 265 | 2200 | 175 | 2765 | 220 | 1.70 | 13.50 | PPS |
- The measured values of the above characteristics are average values, and the tolerance range is about ± 7%, which may vary with different measuring instruments and conditions.
The following are the physical properties of plastic injection magnets:
| Characteristic | Molding density | Curie temperature | Drying temperature | Bending strength | Bending elasticity | Tensile strength | Shrinkage rate | Remanence (BR) temperature coefficient |
| Type | g/cm3 | ℃ | ℃ | Mpa | Gpa | Mpa | % | %/℃ |
| Nylon 6 (PA 6) | 3.34~3.85 | <350 | 120 | 105~172 | 15.9~27.6 | 58.8~96.1 | 0.58~0.78 | -0.19 |
| Nylon 12 (PA 12) | 2.96~3.75 | <350 | 80 | 98~125 | 6.1~17.1 | 45.1~64.7 | 0.75~1.15 | -0.19 |
| PPS | 3.60 | <350 | 120~130 | 95 | 17 | 60 | 0.4 | -0.19 |
