Answer:These are the bricks which are manufactured from refractory clays and can resist high temperatures. These are also called as fire bricks.There are mainly used for lining of interior of furnaces, fire places are in sewers.
Hello, My self Neelmani, A Civil Engineer. Presently I am working with Indian Railway. An Affiliate Member of ASCE “American Society of Civil Engineers”. B.Tech in Civil Engineering from MIT Muzaffarpur and Diploma in Railway from IPWE as well as Civil Engineering from Govt. Polytechnic Muzaffarpur.