l With good thermal shock resistance and high temperature mechanical strength,therefore, the products can withstand severe thermal load of high temperature heaters. Repeated insertion and withdrawal of the products in the course of operation will not affect the performance.

l High thermal shock performanceassures long working time when warming and cooling of molten aluminum, and also temperature difference between heater and liquid.

l Low wettability against molten aluminum can reduce the contacting of slag on the protection tube, and provides easy maintenance and operation.

l Excellent insulation can assure no contact (insulation) between heater and molten aluminum or other molten metal.

l With good high-temperature mechanical strength, corrosion resistance and low wettability, the Si3N4 material can protect the normal working of heater element in the tube for a long time. If proper maintenance, the actual using life can be up to 2-3 years.