St Astier Hydraulic Lime

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St Astier Hydraulic Lime

Availability: In stock

We stock the full range of St Astier hydraulic lime products for use in lime mortars and plasters.
Every effort has been made to ensure the accuracy of the colour and texture of products on this website but due to the limitations of technology, we strongly recommend that sample products are purchased for testing in situ prior to the full order being placed.

St.Astier NHL2 Hydraulic Lime (25kg bag - 40 bags per pallet)

£17.00 (Excl. VAT)

St.Astier NHL3.5 Hydraulic Lime (25kg bag - 40 bags per pallet)

£14.50 (Excl. VAT)

St.Astier NHL5 Hydraulic Lime - 25Kg bags (40 bags per pallet)

£14.00 (Excl. VAT)


St Astier Natural Hydraulic Limes (NHL) and derivative products have been produced by the same families since 1851.

The mineralogical characteristics of the raw materials, the manufacturing process and the quality controls are such that users are assured of the constant performance of the products. The experience acquired over the years is shared with the user through the assistance available from the Technical Department and from carefully chosen specialist distributors, able to assess the type of lime mortar, plaster or render required. This is especially important in Conservation and Restoration, where mortars should be project specific in order to ensure their compatibility with existing materials and the fabric of the buildings.

In new build St.Astier Limes have developed a range of binders and ready mixed mortars combining all the characteristics required by today’s builder in terms of speed of setting, strength, elasticity, plasticity, low capillarity and shrinkage, with the breathability and aesthetic quality of lime mortars. The result is that these lime mortars are becoming the obvious alternative to cement mortars also in the new build and eco build sectors.

The ecological benefits of lime mortars such as CO2 re-absorption and condensation control provide vital answers to some of today’s environmental and energy saving requirements which cannot be ignored by the professions and trades involved in the protection of the built heritage and in the construction of our new living environment.

St. Astier natural hydraulic limes (NHL) and lime mortars have been adopted in a number of countries and in the most diverse climatic conditions, from the Arctic circle to the desert, from marine locations to high mountain sites. They have been and are used on some of the most important world heritage sites, in vernacular and ordinary buildings, in reproducing the characteristics of ancient mortars as well as providing solutions to modern architectural mortar requirements.

The technical expertise at hand will also assist in achieving engineering solutions when an alternative to cement mortars is required.

To see an example of this product in use, please see our case study of The Essex Business School, The University of Essex. 

Technical Documents
View FileWeather Protection Guidance    Size: (211.01 KB)
View FileChoosing a Lime    Size: (237.06 KB)
View FileHydraulic Lime Mortar Application Guide    Size: (573.72 KB)
View FileHydraulic Lime Plaster/Render Application Guide    Size: (731.86 KB)
View FileSt Astier - NHL 2 Tech Sheet    Size: (942.91 KB)
View FileSt. Astier NHL 3.5 - Tech Sheet    Size: (883.3 KB)
View FileSt. Astier NHL5 - Tech Sheet    Size: (706.03 KB)

These French hydraulic limes are at the stronger end of the scale (when compared to the British hydraulic limes)

Variable strengths for most everyday applications:

  • NHL2 – for use in internal plasters, and as mortar for brick and ’soft’ stone.
  • NHL3.5 – for external renders and mortars on harder stone.
  • NHL5 – for external flaunching and mortars in extreme conditions/situations where high strength is required, and low vapour permeability is acceptable.

Gain strength over time hence providing flexibility and avoiding the need for expansion joints.

Considered to be more environmentally friendly than cement as they are burnt at a lower temperature and uniquely reabsorb some of the carbon dioxide given off during burning as they cure/carbonate in/on the wall.

Enable building components to be reclaimed and reused as they are ‘softer’ than cement.

Set under water hence ideal for applications in contact with the sea, canals, rivers etc


To see an example of this product in use, please see our case study of The Essex Business School, The University of Essex.