Concrete Casting Mix. Gray Concrete Precast mix. by SureCrete is advanced fiber reinforced concrete is formulated to allow saturated colors in a convenient dual-component package. Requires the addition of Xtreme Series Modifier to perform as specified. Each 50 lbs bag of CHENG D-FRC is blended with 1 gallon of Surecrete Xtreme Modifier before casting. Casting Mix is a versatile gray cement blend that makes pouring, spraying and even hand-packing concrete an easy to follow, no-fuss process. Create concrete countertops, wall panels, floor tile, fireplace surrounds and furniture. The CHENG D-FRC?s gray cement blend is a perfect base for achieving colors that are rich, warm, and saturated. · ASTM C-109-08 Compressive Strength ? 10,730 psi · ASTM C348-08 Flexural Strength ? 690 psi · Reduced Material Needs ? Average concrete countertop and table top thickness is 3/4?. Small tile 1/4?-3/8? thickness. Large tile and wall panels 3/8?-1/2? · Flexible Casting Temperatures ? 40º - 90ºF · Convenient Packaging ? 50 pound plastic lined bags · Coverage ? 9.8 square feet at 1/2? thickness