Applications of sn, 260 and sn, 240 for riser tube or stalk tube in molten aluminum. Sialon, Silicon nitride, Alumina as well as silicon carbide are known as engineering ceramics. Among them, Silicon nitride has the highest thermal shock it makes, Resistance. Thus handling andpreheating control easier. Low wet tability resistant to flowing aluminum makes material adhesion on tube less and it makes daily maintenance easier. Super Thanks to its superior resilience to oxidative wear it effectively inhibits the ingress of contaminants into molten metal. This represents a key factor to maintain freshness of heated alloy alloys. Silicon nitride is a dense material and maintains its superior mechanical resilience even in high-temperature environments compared to reaction it assures, Bonded materials trouble free operation. Practical accomplishment, In fact demonstrates more than twelve months in use.