bids are invited for boiler refractory material fire bricks standard - fire bricks standard 9inchx4.5inchx3inch , fire cement - special fire bricks of differnt shape and size as per deawing with 30 percent to 50 percent alumina or high alumina compositions for extremc temp , castable refractory having alumina - castable refractory having alumina not less than 60percent silica 5 to 10percent iron 1to2 percent , fire cement - fire cement 1bag-50kg , lrb mattress - good quality lrb mattress operating temperature upto 750c thermal conductivity 0.034-0.037 w mk density range 100 kg m3 thicknes 50mm , lrb mattress - good quality lrb mattress operating temperature upto 750c thermal conductivity 0.034-0.037 w mk density range 100 kg m3 thicknes 75mm , mahakoshal refractory - mahakoshal costable refractory maxheat k total quantity : 4360