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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 temperature heaters.

● It has excellent thermal shock resistance. So, insertion and withdrawal during batch operation will not affect the performance.

● Superior corrosion resistance does not allow eluted contamination into molten metal. The purity of molten alloys is maintained.

● Low wettability against molten aluminum provides easy mainte-nance and handling.

● Actual performance shows more than 1 year operating life.