PROMASONRY Mortar Sand meets or exceeds ASTM C-144 specification for masonry mortar aggregate. SUGGESTED USES:Can be mixed with Portland cement to achieve a high performance mortar, paver base, paver joints, general landscaping, traction in snow and icy conditions. PROMASONRY Mortar Sand can be mixed with Portland cement to achieve a high performance mortar. Below are two charts for proportioning mixes according to ASTM C-270 standards. The first chart specifies a Portland cement and hydrated lime based mix. The second chart specifies a Portland cement or masonry cement based mix. The left panel lists each mortar type and defines how they are most commonly used. Mortar Types and Strengths: Type M - Very high strength mortar (2500+ psi or 17.2+ MPa) commonly used in exterior applications at or below grade. Type S - High strength mortar (1800+ psi or 12.4+ MPa) commonly used in exterior load bearing applications above or below grade Type N - Moderate strength mortar (750+ psi or 5.2+ MPa) commonly used in interior or exterior non load bearing applications at or above grade Type O - Low Strength mortar (350+ psi or 2.4+ MPa) commonly used in tuck pointing and interior non-load bearing applications Type K - Very low Strength mortar typically used when tuck pointing historic structures