procurement of castable firecrete refractory for insulation work of inside bottom ash hopper unit4 during overhauling in 2024 25,sgtpp , procurement ofcastable firecrete refractory for insulation work of inside bottom ash hopper unit 4 during overhauling in 2024 25sgtpp. , refractory,fire crete special castable recommended service temperature 1350 degc,refractoriness (min) 1450degc,dry density (kg/m3) 2250,coldcrushing strength (kg/cm2) 40 0(at 110degc) and ( material shall be as per calderys specifications and should be fire crete special. chemical composition must be as: (1) al2o3 -45% min. (2) fe2o3 within 4%, (3) sio2-46% max. equivalent - ind fh-45 spl, packing-25kg hdpe bag )