procurement of refractory materials (plastic refractory) for unit 6 boiler overhauling under b and a dept.,stps. procurement of refractory materials (plastic refractory) for unit 6 boiler overhauling under b and a dept.,stps. , plastic refractory including binder service temp - max.1650 deg. c,refractoriness - min. 1785 deg. c,bulk density (sample dried at 110 deg c. for 24h ) - 2.7 g/cc (min),chemical analysis %: (1) al2o3: 90 % (nominal) (2) fe2o3 : 0.3% (max.),abrasion loss in cc: as pre astm c-704- 93 [ 1300 deg c. /5 hr 3.5 cc(max)],binder requirement weight % : 9.5 to 10 [j] thermal conductivity at 1000 deg cent= 2.0 to 2.2 kcal/m/hr/deg cent