Our Standard Block come in a myriad of mix designs to conform to each of the ASTM Specifications for Concrete Masonry Units. We are able to produce the wide array of units covered by this specification in every weight classification. Application for these blocks can vary from extremely dense, tight textured units for appearance or shielding applications such as radiation shielding, to extremely light weight units with open textures where again, appearance or the weight of the unit is a factor. These units are available in hundreds of sizes. Most hollow cored units can be insulated. Please view our color page for the array of possibilities for the use of standard units.