St. Astier is Europe's most technologically advanced producer of natural hydraulic limes and the market leader in the UK. They are highly respected in the Lime industry, having been in continuous production since 1851 and long renowned for quality, performance and unparalleled technical support.
St Astier NHL has three standard strengths: NHL2, NHL3.5, and NHL5.
NHL 2, St. Astier's high-quality Natural Hydraulic Lime, is suitable for countless applications in the care and repair of older, traditionally constructed buildings.
Information about Natural Hydraulic Limes (NHL)
These limes are produced from impure limestone, which allows for a hydraulic set. They are supplied in dry powder form and begin to set through a chemical reaction called hydration when water is added. They are available in 25kg bags.
- Suitable for most masonry types
- High vapour permeability - Breathable
- Flexible - Good modulus of elasticity
NHL2 is the weakest of the three classifications for NHL (Natural Hydraulic Lime). It is considered the most appropriate type for many applications involving the care and repair of older, traditionally constructed buildings. It provides a breathable mortar/render, allowing moisture to be wicked out of masonry, and is suitable for all but the most exposed locations
Use & Application
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NHL2: This material is feeble hydraulic, highly vapour permeable, and suitable for mortars, renders, plasters, grouts, and limewash. It should be used on soft or friable backgrounds in sheltered locations.
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You should mix it with clean and well-graded sand at a ratio ranging from 1:1.5 to 1:3, depending on the application and/or background conditions, the joint's size, and the sand's fineness.
- The working temperatures should not be below 5 degrees Celsius or above 30 degrees Celsius. Ensure that high-suction materials are thoroughly dampened before application. Using appropriate curing methods, avoid rapid drying due to high temperatures or strong winds. Fresh mortar should be protected from frost, rain, direct sun, and strong winds for at least 48 hours, depending on the time of year.
- Please refer to the Technical Data and Documentation section for more detailed product information, application guidance, and datasheets. Always make sure to read the available datasheets and guidance before use. Each project is unique, so it's always best to seek professional advice before undertaking a project.
- When working with lime, an alkaline material, always ensure you wear the appropriate personal protective equipment (PPE).
