LIME PLASTER - Product Details

What is Lime Plastering? Lime plastering involves applying a mixture of lime, sand, and water to surfaces, creating a natural and durable finish. It is widely used in both interior and exterior applications for historic restorations and sustainable construction.

COMPONENTS OF LIME PLASTER
  • Lime: The main component of lime plaster, usually available in different forms such as hydraulic lime or non-hydraulic lime.
    • Hydraulic Lime: Contains clay and other impurities, which allows it to set through a chemical reaction with water. It's suitable for exterior and damp areas.
    • Non-Hydraulic Lime: Also known as air lime, it sets by reacting with carbon dioxide in the air. It’s typically used for interior work and in dryer environments.
  • Sand: Acts as the aggregate, providing structure and bulk to the plaster. The sand should be clean, well-graded, and free from impurities.
  • Water: Essential for the lime to undergo its chemical reactions and set.

TYPE OF LIME PLASTER

Fat Lime (Non-Hydraulic Lime)
  • Composition: Fat lime is primarily composed of calcium hydroxide (Ca(OH)₂), with very few impurities.
  • Properties:
    • High Calcium Content: Fat lime has a high calcium content, making it highly pure.
    • Slow Setting: It sets slowly, primarily through a process called carbonation, where it reacts with carbon dioxide (CO₂) from the air to form calcium carbonate (CaCO₃).
    • Workability: Very plastic and easy to work with, offering a smooth and fine finish.
    • Breathability: Highly breathable, allowing moisture to escape from walls, which is beneficial for historic buildings.
    • Low Strength: Not as strong as hydraulic lime, making it more suitable for interior work and less load-bearing structures.
  • Uses:
    • Ideal for internal plastering, whitewashing, and restoration of historic buildings where breathability and flexibility are important.
Ash Lime (Hydraulic Lime)
  • Composition: Ash lime, also known as hydraulic lime, is made by burning impure limestone that contains clay and other siliceous materials. These impurities give it hydraulic properties, allowing it to set underwater.
  • Properties:
    • Hydraulicity: Can set and harden in the presence of water, thanks to the clay content that leads to the formation of calcium silicates.
    • Faster Setting: Sets quicker than fat lime, making it more practical for use in external and structural applications.
    • Strength: Higher compressive strength compared to fat lime, making it suitable for load-bearing structures.
    • Durability: More resistant to weathering, making it ideal for exterior plastering and masonry.
  • Uses:
    • Commonly used in situations where greater strength and durability are required, such as in foundations, external walls, and areas exposed to moisture. It is also used in the construction of hydraulic structures like dams and bridges.
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