1.For tundish with dry vibration mix lining, tundish should be cleaned before sintering, tundish cover should be changed if it is damaged. Under normal working condition, the sintering time for tundish should be more than 2.5 hours but less than 3.5 hours. Please follow the below procedures:
Small fire: Not less than 50 minutes;
Medium fire: Not less than 50 minutes;
Strong fire: Not less than 50 minutes;
Make sure sintering temperature is above 900 Deg.C, tundish in red hot condition.

2.Under abnormal working condition(time is not enough), the sintering time for tundish should be more than 2 hours, 60 minutes with medium fire and 60 minutes for strong fire. There have many kinds of refractory products in our factory. Such as fire brick for sale, Magnesia Carbon Brick, refractory nozzle, refractory raw materials and other refractory products.

Artilce source: http://www.chinafirebrick.com/Company_News_116.html