Rosal Dunas Limestone is a naturally occurring stone characterized by its bone white to light beige color, offering a compact appearance that is enhanced by the alignment of very fine brownish grains. This limestone is quarried in the region of Codacal Nº 2 – Rafaeis, Codaçal – SERRO VENTOSO, Portugal, and is noted for its aesthetic appeal and desirable physical properties.

Physical and Mechanical Properties

• Color:Beige to bone white with brownish fine grains.
• Water Absorption:6.3% by weight.
• Density:2290 kg/m³.
• Flexural Strength:10.60 MPa.
• Compressive Strength:71.7 MPa.
• Hardness:Limestone typically ranks around 3-4 on the Mohs scale, indicating moderate hardness.
• Porosity:12,6 % Generally medium to high, given the water absorption rate.
• Slip Resistance:Varies depending on surface finish; typically, a honed or sandblasted finish provides better slip resistance.
• Abrasion test: 21,5 mm

Chemical and Mineral Composition

While specific chemical compositions can vary, typical components for a limestone include:

• Calcium Carbonate (CaCO₃):Usually around 90% or higher by weight.

• Magnesium Carbonate (MgCO₃):Generally present in small amounts, typically less than 5%.

• Others:Minor elements might include clay, quartz, and small amounts of iron oxide, which contribute to the coloration.

Usage

• Interior Applications:Flooring, wall cladding, and staircases.

• Exterior Applications:Facade cladding, paving, and decorative stonework.

• Additional Uses:Kitchen countertops, bathroom vanities, and fireplace surrounds.

Maintenance

• Cleaning:Use pH-neutral cleaners; avoid acidic or highly alkaline cleaning products to prevent surface damage.

• Sealing:Periodic sealing is recommended to protect against stains, especially for interior applications like kitchen countertops.

• Handling Stains:Prompt cleaning of spills is recommended to avoid staining.

Cutting Sizes and Surface Finish Options

Cutting Sizes:Customary tile sizes are usually cut in cm, such as:

• 30 x 30 cm
• 60 x 30 cm
• 60 x 40 cm
• Slabs in larger sizes, like 240 x 120 cm, for countertops or larger cladding panels.

Common Surface Finishes:

• Honed: Smooth and matte, giving a modern and clean look.
• Polished: Glossy with enhanced color and natural patterns visible.
• Brushed: Offers a textured and rustic finish, providing good slip resistance.
• Sandblasted: Provides a rough texture, enhancing slip resistance and used for exterior applications.
• Bush-hammered: Coarse texture providing a rugged outdoor look and slip resistance.

Rosal Dunas Limestone is a versatile material that combines aesthetic appeal with durable physical properties, making it suitable for a wide range of architectural and design projects. Regular maintenance and appropriate surface treatments can help preserve its appearance and functionality over time.