This single-component, cementitious, non-shrinking mortar is designed for securing anchors, tie rods and bolts in new or existing masonry structures. Jahn M80 is mineral based and maintains a high pH, protecting anchors from rust. It is excellent for pinning or anchoring bolts and structural steel. When properly cured, M80 achieves approximately 6,500 psi in 24 hours and up to 10,000 psi in 72 hours. M80 is vapor permeable and is resistant to the destructive effects of repeated freeze-thaw cycles.