PHL-500 is a pre-blended, pre-packaged mortar specifically designed for use with clay, concrete and stone masonry units within the context of an historic preservation project or new sustainable construction project (LEED). PHL-500 is a blend of Pozzolanic lime, hydrated Type S lime, an air-entraining agent and masonry sand. It is off-white in colour, but can also be blended with a variety of colouring agents.