Martin Marietta lightweight cement is a fine grind, low-density cement that can be mixed over a range of 12.0 to 14.2 pounds/gallon, and has a typical Blaine surface area of 7,300 square cm/gram. 24-hour compressive strengths of 1,400-1,800 psi at 120F with 75% mix water. For current SDS information, email safety.administrator@martinmarietta ...