Magnet selection Chart

Material

Cost
Index

Strength Index 

Permanence
Index
Easy to Machine

Max.Oper. Temp.C

Optimum Dia:Thk

Field Depth

Alnico 

30%

20% 

3% 10%

540

1 : 4

long

Bonded Ndfeb

40%

25% 

50% 95%

150

----

short

Ceramic

5%

20% 

16% 10%

300

8 : 1

med

NdFeB

45%

100%

100% 10%

180

10 : 1

med