Over Molded Magnets

Overview

Magnets are over molded with a very thin layer of polymers like POM, Nylons, PPS etc. to either shield them from dust, grease, oils & chemicals OR for some functional performance of the magnet assembly. Ashvini Magnets provides precision engineered range of over molded magnets which are available in dimensionally accurate designs which make them ideal for miniaturization.

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Characteristics

  • The polymer over molding helps the magnet to be used for tight fit, snap fit etc. kind of fitments over the mating parts
  • Due to the good wear & lubricating characteristic of these polymers, over molded magnets can be used where they can slide continuously on another shaft
  • Magnets can be over molded with certain polymer foams to reduce the specific gravity and create float assemblies which buoyant
  • Most of the cases magnets are over molded by polymers to shield them from environmental challenges and make them weather proof and durable
  • Over molding ensures ease in cleaning of the magnets in certain applications like filters, drain plugs etc. where the magnet may be required to be removed and cleaned at certain intervals

Product Examples

Specifications


Injection Bonded Ferrite Magnets

GRADES

TESTING METHOD)

2M28B19L

2M28B19S

1M15B06S

1M24B14H

1M25B15S

1M28B20S

1T29B20S

Property

Units

Binder

PA12

PA12

PA6

PA6

PA6

PA6

PA6

Br
Residual Induction

mT (G)

JIS C2501**

279
(2790)

278
(2780)

156
(1560)

240
(2400)

248
(2480)

288

(2880

288

(2880)

bHc
Coercive Force

kA/m (Oe)

JIS C2501**

183
(2350)

183
(2300)

123
(1550)

177
(2230)

183
(2300)

183
(2300)

189
(2380)

iHc
Intrinsic Coercivity

kA/m (Oe)

JIS C2501**

211
(2700)

216
(2710)

236
(2970)

239
(3000)

237
(2980)

211
(2650)

231
(2900)

BHmax
Max. Energy Product

kJ/m3 (MGOe)

JIS C2501**

15.4
(1.94)

15.4
(1.93)

4.9
(0.61)

11.4
(1.43)

12.2
(1.53)

15.8
(1.99)

15.9
(2.00)

Moulded density

gm/cm3

 

 

 

 

 

 

3.6

3.6

Tensile Strength

X 105N/m2 (kgf/cm2)

ASTM D-638**

550
(560)

 

 

 

780
(800)

710
(720)

725
(740)

Flexural Strength

X 105N/m2 (kgf/cm2)

ASTM D-790**

1180
(1200)

1240
(1260)

1620
(1650)

1770
(1800)

1940
(1980)

1710
(1740)

1590
(1620)

Flexural Modulus

X 109N/m2 (X104kgf/cm2)

ASTM D-790**

14.0
(14.3)

15.6
(16.0)

8.0
(8.2)

14.7
(15.0)

17.4
(17.7)

21.4
(21.8)

23.7
(24.5)

Impact Strength IZOD

kJ/m2 (kgf*cm/cm2) ASTM D-256** (without nouch 25.3
(25.8)		 16.7
(17.0)		 NB 22.6
(23)		 30.2
(30.8)		 14.7
(15.0)		 15.3
(15.6)

Melt Flow Rate MFR

g/10min ASTM D-1238** 80*

108*

 75*2 320* 105* 128* 109*
Molded Density g/cm3 ASTM D-792** 3.62 3.62 2.56 3.27 3.37 3.67 3.8
** : To be governed l NB : Non Break l * : 270OC X 10 kg l *1 : 330OC X 10 kg l *2 : 230OC X 5 kg
*3 : 270OC X 3.61 kg l *4 : 270OC X 5 kg l *5 : 330OC X 5 kg

Enquire

Getting started is easy! Send us a drawing or get in touch with a solutions expert at Ashvini Magnets to discuss your requirements.

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