Radio Shack Ceramic Magnet
(640-1877)                 Specifications 

Description: .................... Ceramic Block 1.87 x 0.87 x 0.390 Inches

Material: ..................................... Oriented Strontium Ferrite



Magnetic Properties:

Residual Flux Density (B sub r): ............................. 3,850 Gauss

Coercive Force (H sub c): ................................. 2,950 Oersteds

Max Energy Product (BH sub max): ............................. 3.5 MG * Oe

Average Recoil Permeability: ......................................... 1.1

Field Strength needed to saturate: ............................. 10,000 Oe

Temperature needed to permanently ruin: .................. 1,800 Degrees F



Physical Properties:

Density: .................................................. 0.180 lbs/In^3

Coefficient of Thermal Expansion: ............. 10.3 per degrees C x 10^-6

Resistivity at 25 degrees C: .................... 10^10 micro-Ohms/cm/cm^2

Rockwell Hardness Scales: .......................................... off C

Dimensions (HWD): ............................... 3/8 x 1-7/8 x 7/8 Inches