Product Overview
Saint-Astier® NHL 2 – The Chalk Lime for Historic and Eco-Friendly Builds
Gentle Hydraulic Lime | 2 MPa Strength | 100% Natural
Saint-Astier® NHL 2 is a pure, feebly hydraulic lime ideal for projects requiring high breathability, flexibility, and compatibility with soft or historic materials. Sourced from the renowned Saint-Astier quarry in France, this lime has been trusted for over 160 years in restoration and sustainable construction.
Key Benefits
● High Vapor Permeability: Promotes moisture exchange, reducing the risk of trapped moisture and associated damage.
● Elasticity: Accommodates minor movements, making it suitable for delicate structures.
● Self-Healing Properties: The free lime content enables autogenous healing of micro-cracks.
● Compatibility: Ideal for use with soft masonry, historic bricks, and natural materials like adobe and cob.
● Eco-Friendly: Contains no additives or Portland cement, aligning with sustainable building practices.
Recommended Applications
● Interior and Exterior Plastering: Provides a breathable finish for walls.
● Pointing and Repointing: Suitable for soft or friable masonry joints.
● Rendering: Offers a protective and aesthetic finish for various substrates.
● Hempcrete and Strawbale Construction: Works well with natural building materials.
● Decorative Finishes: Allows for fine detailing and artistic applications.
Application Guidelines
● Mixing: Combine with clean, sharp sand (with a well-graded particle size) and potable water. Sea water can be used if necessary.
● Substrate Preparation: Dampen the surface before application to prevent rapid drying.
● Application Conditions: Apply at temperatures between 8°C and 30°C. Protect from frost and rapid drying conditions.
● Curing: Maintain moisture for at least 10 days post-application to ensure proper curing.
● Reworking: Mortar can be reworked within 24 hours without significant loss of strength.
Packaging and Storage
● Available Sizes: 25 kg bags.
● Shelf Life: 12 months when stored in a dry environment, away from moisture.