Natural Hydraulic Lime

Natural Hydraulic Lime (NHL) is obtained by the calcination of argillaceous or siliceous limestone. The burning process produces calcium oxide and calcium silicates and calcium aluminates. The resulting material is ground, hydrated and carefully packaged. The resulting Natural Hydraulic Lime, when put in contact with water, will set and harden. Carbon dioxide present in the air also contributes to this hardening process.

Natural Hydraulic Lime is mixed on site with suitable aggregates to give compatible, flexible, breathable and beautiful plasters and mortars. In conjunction with this, its very special hydraulic set gives the added benefit of robustness and long-term durability.

Stoneware Studios provides the greatest variety of Natural Hydraulic Limes available in Ireland today, allowing the specifier and user to make informed decisions on the repair of their historic structure. Our test laboratories in Ireland, England and France are continually testing our Natural Hydraulic Limes, Blue Lias NHL and Roundtower NHL, to ensure consistency of performance and adherence to the strict International standard on building limes, EN-459.