Ferrite powders consist of iron oxides that are sintered at high temp with 

Barium and Strontium carbonates, suitably milled . It has particle size range from approximately 40um to 150um and is a course black powder .

It is a ceramic material made mixing and firing.

Strontium/ Barium Magnetic ferrite powder apply for Rubber magnetic sheet, Magnetic strip for door gaskets in refrigerators, damping fin of automobile.

Characteristic: High remanence, high intrinsic, symmetrical grain size, stable property. 

We can also do OEM & ODM according to your requirement. 

Picture of Y30 ferrite powder: 1 

Specification of ferrite powder: 2

Picture of Iron Red:  3