Protection tubes for electric heaters and gas burners are already practically in use
Silicon nitride ceramics is superb in heat resistance. So, the product withstands severe thermal load of high temperatureheaters. It has excellent thermal shock resistance. So, insertion and withdrawal during batch operation will not affect the performance. Super ior cor rosion resistance does not al low e luted contamination into molten metal. The purity of molten alloys ismaintained. Low wettability against molten aluminum provides easy maintenance and handling. Actual performance shows more than 1 year operating life.