ImerFill 25 is a ground white calcitic marble with a high calcium content. It has been manufactured with an engineered particle size distribution beneficial for concrete mixes. The use of ImerFill 25 has been shown to provide savings through reduction in cement and water reducing agents, better rheological properties, reduced segregation and improved surface finishes. Depending on formulation design, improvements in strength, impact resistance and duralbility can also be realized. ImerFill 25 meets the chemical and physical requirements of ASTM C1797-16 Type A.