SAINT-ASTIER CHIMNEY: building materials & systems

For more than 110 years, the CHAUX de SAINT-ASTIER® brand embodies French excellence in the production of pure natural hydraulic lime. Located in the heart of the Perigord Blanc, in Dordogne, this independent family business perpetuates rare know-how while innovating towards a sustainable and responsible construction.

A geologically unique raw material

What distinguishes Saint-Astier is the exclusive exploitation of a underground deposit of chalky siliceous limestone, unique in Europe. This sedimentary rock, of exceptional homogeneity, is the key to the chemical purity and mineralogical consistency Saint-Astier products. For over a century, this geological stability ensures the reliability and durability of the lime produced, without variation in quality or alteration in performance.

“The consistency of our limestone is our technical signature. It guarantees reliable, long-lasting products without additives.”

This limestone offers a mineralogy naturally rich in silicates, allowing a natural hydraulic intake without the addition of cement or other artificial compounds. In addition, there is a air intake by carbonation, which gives the lime a double progressive solidity: first in contact with water, then with air.

A range of products serving construction and ecology

Saint-Astier offers several mineral solutions suitable for various uses:

• Pure natural hydraulic lime : without any additives, compliant with standard EN 459-1.
• Formulated lime : combined with other natural components for specific applications.
• Technical mortars : ready to use, formulated for the heritage renovation or ecological construction.

These products are popular both for the restoration of old buildings that for contemporary bio-sourced projectsThey are compatible with materials such as hemp, linen or brick, promoting breathable, durable and environmentally friendly.

Focus on the technical properties of Saint-Astier lime

Remarkable physicochemical characteristics

• Double take : hydraulic then aerial, for progressive resistance.
• Microporosity : allows the walls to breathe, preventing condensation and mold.
• Flexibility and elasticity : limits cracks, promotesself-healing mortars.
• Water resistance : impermeable to runoff, while remaining permeable to vapor.
• High alkalinity : prevents the development of harmful microorganisms.

Proven durability in all conditions

Thanks to their mineral purity and the absence of unstable components (sulfates, plasters, water repellents), Saint-Astier limes are resistant to aggressive environments:

• No risk of alkali-silica reaction.
• Great resistance in marine environments.
• No expansion due to salts.

“Our limes are designed to last, even in the harshest weather.”

A company at the crossroads of heritage and innovation

Four generations, one commitment

Since its founding, the company has remained independent, driven by a family vision that values the transmission of know-how, territorial anchoring and quality requirementThe industrial tool has been modernized without ever betraying the artisanal nature of the production.

Official recognition of French know-how

Saint-Astier was labeled Living Heritage Company (EPV) in 2022, a distinctive sign of its artisanal excellence. It is also certified Origin France Guarantee for its natural lime, promoting 100% local manufacturing, from extraction to packaging.

Other regional distinctions recognize his economic dynamism, to social responsibility and its contribution to the promotion of architectural heritage French.

A vision resolutely turned towards the future

Heading for decarbonization

Aware of climate issues, Saint-Astier is working to reduce carbon footprint of its production. The company invests in the modernization of its ovens, in low-carbon innovations, and develops mineral solutions compatible with current environmental requirements.

A strategic international opening

Already present in several foreign markets, Saint-Astier is consolidating its French brand identity while adapting its offering to international needs. Its expertise appeals to both heritage architects eco-responsible project managers, that craftsmen engaged in sustainable construction.

Lime serving history and the future

Saint-Astier does not just produce lime. It embodies a vision of sustainable building, rooted in history, geology and technologyAt a time when the sector is seeking to combine performance, eco-responsibility et heritage preservation, Saint-Astier offers a coherent, proven, and above all natural response.