bids are invited for gompa ordinary portland cement opc 43 grade in 50 kg bags , course sand sand shall be clean sharp angular hard and durable free from adherent coating , 20mm stone aggregate stone aggregate shall be crushed stone 20 mm graded , 40mm stone aggregate stone aggregate shall be crushed stone 40 mm graded conforming , 63mm stone aggregate stone aggregate shall be crushed stone 63 mm graded , hdpe sheet suplly and laying 400 thickness , pvc strips of size 3mm thick 38mm wide , ply wood 12mm thick size 8 feet x 4 feet , wooden runners 2 inchx 2 inch , nails , exterior emulsion paint apex provn of construction material for helipad at total quantity : 3183