Angola Grey Limestone

Angola Grey Limestone is a versatile and aesthetically pleasing natural stone quarried in Angola. It features a neutral grey base with subtle white crystalline veins and variations in tone, making it an appealing choice for numerous architectural and design applications. Its durability and weather resistance make it suitable for both interior and exterior use.

Physical and Mechanical Properties

• Water Absorption:Low, typically around 0.2% to 0.35%, indicating good resistance to water penetration.

• Density:Approximately 2,650 to 2,680 kg/m³, which contributes to its strength and durability.

• Flexural Strength:Generally ranges from 8 to 12 MPa, reflecting its capacity to withstand bending forces.

• Compressive Strength:Typically between 70 to 80 MPa, indicating good resistance to crushing loads.

• Hardness:On the Mohs scale, it ranges from 3 to 4, making it relatively easy to work with but durable enough for most applications.

• Porosity:Low porosity, which enhances its durability and resistance to staining.

• Slip Resistance:Depending on the surface finish, generally offers adequate slip resistance for both indoor and outdoor applications.

Chemical and Mineral Composition

• Calcium Carbonate (CaCO₃): Predominantly over 90%, contributing to its durability.
• Silica (SiO₂): Approximately 2% to 5%, aiding in hardness.
• Aluminum Oxide (Al₂O₃): About 0.5% to 1%, contributing to overall structural integrity.
• Iron Oxide (Fe₂O₃): 0.2% to 0.5%, which can influence overall color and veining.
• Magnesium Oxide (MgO): Present in small percentages, adding to the stone's hardness.

Usage and Applications

• Interior Applications: Suitable for flooring, wall cladding, countertops, bathroom vanities, and decorative elements.
• Exterior Applications: Ideal for facades, paving, pool coping, and garden landscaping due to its weather resistance.

Maintenance

• Regular Cleaning: Use pH-neutral cleaners to avoid damaging the limestone.
• Sealing: Periodic sealing recommended to enhance stain resistance and maintain finish.
• Avoid Acidic Cleaners: Do not use cleaners with acidic properties as they can etch the limestone surface.

Common Surface Finish Options

• Polished: Offers a shiny, reflective surface, enhancing the natural color and veining.
• Honed: Provides a smooth, matte finish that is less reflective.
• Brushed: Offers a textured, antiqued look.
• Bush-Hammered: A rough finish that provides excellent slip resistance, ideal for external paving.

Cutting Sizes (Typical)

• Tiles: Commonly available in sizes like 30x30 cm, 30x60 cm, 60x60 cm, and custom sizes based on project needs.
• Slabs: Typically cut in thicknesses of 2 cm and 3 cm, with custom lengths and widths.

Angola Grey Limestone stands out for its gentle aesthetics combined with substantial durability, making it an impeccable choice for a wide range of architectural and design purposes.