Property EF Series MF Series Magnetic Properties (VSM @ 4000 Oe) Ms (emu/g) Hci (Oe)   58 - 78 < 15   80 - 95 < 20 Resistivity @ 1000V (ohm-cm) 107 to 109 106 to 108 Apparent Density (g/cc) (50µ) (80µ) 2.2 - 2.5 2.4 - 2.7 2.2 - 2.5 2.4 - 2.7 Surface Type Smooth to Wrinkled Intermediate to Wrinkled Average Particle Size (Microns) All products are spherical spray dried distributions and are produced to the following standards APS: 100, 80, 60, 50 and 35 micron sizes. Coatings Powdertech coats its products with Fluoropolymer, Acrylic, or Silicone materials. The choice of coating depends on the desired end properties wanted in the carrier. Three reasons to coat a core are to add life, adjust the resistivity, and adjust the tribo.  Coatings can make the core charge either positive (+) or negative (-).

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