Saint-Astier Natural Hydraulic Lime (NHL) has been in production for over 150 years and is globally recognized for its unique characteristics due to the high degree of natural purity of the raw materials.
Natural Hydraulic Lime (NHL) is made from limestone containing trace amounts of other minerals, which enable a hydraulic set. They are supplied as dry powders, and when water is added, they begin to set through a chemical reaction known as hydration.
Like with many traditional building materials, NHL can be manipulated and mixed, so it can be used to make limewashes, mortars, renders, stuccos, plasters, grouts, and more depending on adjacent materials, substrates, the environment, and the desired outcome.
Natural Hydraulic Lime (NHL) is produced in 3 standard grades based on compressive strength, NHL 2, NHL 3.5, and NHL 5, each with their own uses and advantages.
Feebly hydraulic, used when elasticity, low strength or high vapor exchange are desirable.
Moderately hydraulic, recommended when moderate strength and better freeze-thaw resistance are required.
Eminently hydraulic, specified when strength and high freeze-thaw resistance are necessary.
Areas of use
Natural Hydraulic Lime (NHL) is a versatile material that can used in different ways. Always make a test to ensure the desired outcome.
Example Use Cases
Finishes, plasters, mortars for weak stones, lime renders.
Base coats, mortars for stone work, laying or repointing brick, stone and terra cotta units, even in extreme freeze-thaw climate cycles. Can be used to make scratch, brown and finish coats of exterior stucco.
Slabs, mortars for hard stones, building or repairing wall head copings, pointing and parging the water table or foundation of a building and making lime concrete. Sea-bearing walls can be built and repaired with NHL 5 since it has only trace amounts of soluble salts.
Determining material quantities needed can depend on a number of variables. For more detailed calculations, use the Limeworks Material Calculator.
Need Pre-mixed material?
Check out the Limeworks premixed Ecologic Mortar, based on Saint-Astier Natural Hydraulic Lime.