Thermitrex (Pty) Ltd manufactures Thermit welding igniters. Each igniter contains no more than 5 grams of barium nitrate, aluminum powder, and a stabilizer and binder on a steel core wire. The igniters burn at a high temperature and emit toxic fumes when burned in large quantities or confined spaces. Proper storage and handling is necessary to avoid ignition and exposure to the hazardous materials. Personal protective equipment should be worn when using the igniters for welding.