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High temperature electrical grade magnesium oxide usually is used to make heating element with air as the heating medium, such as the heating element in the oven - the electric heating element that has been nitrided at 1050℃ temperature. Electrical grade magnesium oxide is mixed with special additives and characterized by high temperature calcining in rotary furnace, magnetic substance <100PPm, magnesium oxide after special rotary furnace treatment, low iron, low phosphorus, low sulfur, long service life, stable electrical performance, good electrical performance in the heating state.