procurement of different spares of refractory under bm2 dept. for upcoming u4 overhauling at sgtpp , procurement of different spares of refractory under bm2 dept. for upcoming u4 overhauling at sgtpp , fire crete super / ind fh-70 / equivalent refractory cement ( make: calderys. ) , refractory-whytheat-a for insulation ( make: calderys. ) , plastic refractory, single component service temp-max.1700 deg c, refractoriness- min.1820 deg , dry density ( drying at 260 deg c for 3 hrs ) =2.4-2.65 g / cc, grain size-6mm max, cold crushing strengt h=400-550kg / cm2 ( after heating at 1500 deg c / 3hrs ) rnchemical analysisrn1 ) al2o3=80-90%rn2 ) fe2o3=1.25-1.5% ( make: calderys. )