procurement of castable refractory whyheat grade a, firecrate p and plastic refractory for boiler of unit no. 01 to 5 sgtps, mppgcl, birsinghpur - castable refractory whytheat grade a or equivalent :-a. chemical compositioni. al2o3 91%(min)ii. fe2o3 0.8%(max)b. physical compositioni. grain size- 5mm(max)ii. refractory 1820 deg. ciii. max service temp. 1785 deg. civ. dry density (kg/m3) 2800 after drying at(+) & (-) 5% 110 c/24 hrs.permanent line changes (+) & (-) 1% after heating at (max) 1550 deg. c/24 hrs. 2 castable refractory whytheat grade p or equivalent:- a. chemical compositioni. al2o3 46%(min)ii. fe2o3 3.2%(max)b. physical compositioni. grain size----5mm(max)ii. refractory 1605deg. ciii. max service temp. 1400 deg. civ. dry density (kg/m3) 2100 after drying at(+) & (-) 5% 110 deg.c/24 hrs.permanent line changes (+) & (-) 1% after 3 hrscold crushing strength 400 (min) (kg/cm2) after drying at 110 deg c/24 hrs. 3 plastic refractory:-technical specification :-rangeservice temperature:-1650 ⁰c max.refractoriness:-1785 ⁰c minbulk density (sample dried at 110 ⁰c for 24 hrs):-2.7 g/cccold crushing strength at110 ⁰c /24 hrs :-650 kg/cm²1300 ⁰c / 5 hrs:-875 kg/ cm²modulus of rupture at 110 ⁰c /24 hrs:-100 kg/cm²1300 ⁰c / 24 hrs:-160 kg/ cm²permanent linear change at 1300 ⁰c / 5 hrs :-0.60% max.chemical analysis al2o3 (nominal) :- 90.0%fe2o3 (max) :-0.3%abrasion loss pre-fired at110 ⁰c /24 hrs :-5.0 cc1300 ⁰c / 5 hrs:-3.5 ccbinder requirement :-9.5 to 10% of wtthermal conductivity at 1000 ⁰c:-2.0 to 2.2 kcal/m/hr/⁰cmethod of application:-ramming/hand