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
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