Electrical Steel


Martin Marietta Magnesia Specialties provides magnesium oxide for use in electrical steel applications.


MagChem 20 SC logo MagChem 50 SC logo

MagChem® 20 SC and MagChem® 50 SC are high purity, micronized grades of magnesium oxide that are used in the manufacture of silicon grain-oriented steel for high efficiency distribution transformer cores, specialty ceramics, and coatings.

In the annealing process, MagChem® 20 SC and MagChem® 50 SC react with the silicon steel to form a glass-like film during the high temperature anneal, which then acts as an electrical insulator between core laminations in an electrical transformer.

Technical Data Sheets

MagChem® 20 SC

MagChem® 50 SC

Common Applications

  • Silicon grain-oriented steel

For more information regarding your application or to place an order, please call 800-648-7400 (inside the U.S.) or +1-410-780-5500. Or, Contact Us with your questions.