Spec Mix 94 lb. Type S Masonry Mortar Designed specifically for use by masonry contractors, the Spec Mix 94 lb. Type S Masonry Mortar provides consistent batches of type S mortar for applying brick, stone and block. The mortar offers 1,800 psi strength and a 2-hour working time.For use in the application of block, brick and stoneDry, factory-blended mix2 Hour working timeGray colorYields consistent batches1,800 PsiMeets ASTM C-270 and UBC 21-15 standardsSaves time and money on labor