MOLDING: GRP SCREEN SHALL CONSIST OF FIBERGLASS MOLDED WITH SMOOTH SURFACES; ALL BI-DIRECTIONAL BEARING BARS OF THE SCREEN SHALL BE MOLDED AT THE SAME TIME INTO A ONE PIECE CONSTRUCTION; RESIN SYSTEM: THE GRP SCREEN SHALL CONSIST OF 130 PARTS BY WEIGHT OF ALUMINA TRIHYDRATE (ATH) TO 100 PARTS MODIFIED ACRYLIC RESIN (MODAR); THE GLASS CONTENT OF THE GRP SCREEN SHALL BE A MINIMUM OF 25% AND A MAXIMUM OF 35% BY WEIGHT AS DETERMINED BY ASTM D-2584 FOR MAXIMUM SUNLIGHT AND CHEMICAL RESISTANCE