Heidelberg Materials Hydrated Lime is perfect for mortar, render, and plaster, meeting the high calcium standards of BS EN 459-1 CL 90-S. This lime improves the plasticity and water retention of Portland cement, and is also useful for soil stabilization and water treatment. It requires Portland cement to be effective in mortars and renders. For use in Cement: Sand, Lime mortars, it offers excellent workability and good water retention.