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Osterloh Black Granite

Osterloh Black GraniteOsterloh Black GraniteOsterloh Black GraniteOsterloh Black Granite
Osterloh Black Granite

Black - Granite

Brazil

About

Item Details

Material Type:
Granite
Origin:
Brazil (Espirito Santo)
Primary Color(s):
Black
Recommended Usage:
kitchen and bathroom countertop, wash basins, building stone, ornamental stone, stairs, interior, exterior wall and floor applications, mosaic, water-jet pattern, wall panels, table tops, balustrades, columns, wall and pool copings, pool pavers, fireplaces, window sills
Additional Names:
Astrus Black Granite, Granito Preto Astrus, Astrus Granite Granite, Ostrohe Dark Granite, in China stone market: 奥斯特洛黑(ào sī tè luò hēi), Osterloh Black, Osterloh Black Granite
Finished Surface:
Polished,Flamed,Bush Hammered,Tumbled,Brushed,Honed,Split,Machine Cut,Natural Surface,Sandblasted,Acid Washing,Combed,Leathered,Chiseled,Pickling

Testing

Water Absorption:
< 0.5%
Density:
2670 - 2720 kg/m³
Flexural Strength:
14 - 18 MPa
Compressive Strength:
200 - 220 MPa
Stone texture:
a deep black to very dark charcoal background, enriched with fine, evenly dispersed crystalline mineral speckles in subtle gray and silver tones that give the surface a refined, slightly sparkling effect, especially in polished finishes. Its overall appearance is uniform, elegant, and contemporary, with minimal variation and no pronounced veining, making it well-suited for modern architectural and design applications requiring a strong, consistent dark aesthetic. The texture is medium- to fine-grained and densely crystalline, composed of tightly interlocked quartz, feldspar, and mica minerals, forming a compact structure with high hardness, low porosity, and excellent mechanical strength

Description

Osterloh Black Granite features a deep black to very dark charcoal background enhanced with fine, evenly dispersed crystalline mineral speckles in subtle gray and silver tones. This design imparts a refined, slightly sparkling effect, especially in polished finishes. Its appearance is uniform, elegant, and contemporary, making it ideal for modern architectural and design applications requiring a strong, consistent dark aesthetic. The medium- to fine-grained texture and densely crystalline structure consist of tightly interlocked quartz, feldspar, and mica minerals, resulting in a compact structure with high hardness, low porosity, and excellent mechanical strength. This granite is quarried in Espírito Santo, Brazil.

Physical and Mechanical Properties

  • Water Absorption: Low, < 0.5%
  • Density: Approximately 2.67 - 2.72 g/cm³
  • Flexural Strength: Typically 14 - 18 MPa
  • Compressive Strength: Approximately 200 - 220 MPa
  • Hardness: 6 - 7 on Mohs scale
  • Porosity: Very Low
  • Slip Resistance: Moderate to High, depending on finish

Chemical and Mineral Composition (% by Weight)

  • Quartz: 20-30%
  • Feldspar: 50-60%
  • Mica (Biotite and/or Muscovite): 5-15%
  • Other Minerals (including accessory minerals like amphiboles): 5-10%

Usage

  • Interior and Exterior Flooring
  • Countertops and Vanities
  • Wall Cladding and Facades
  • Fireplace Surrounds
  • Staircases
  • Furniture Tops and Other Decorative Elements

Maintenance

  • Cleaning: Regular cleaning with a damp cloth and mild soap; avoid acidic or abrasive cleaners.
  • Sealing: Periodic sealing is recommended to maintain water resistance and enhance the surface gloss.
  • Polishing: Regular polishing may be required to maintain a high gloss finish.

Common Surface Finishes

  • Polished: Offers a high-gloss finish, enhancing the rich colors and patterns.
  • Honed: Provides a smooth, matte finish, reducing glare.
  • Brushed/Antique: Adds texture to the surface, offering a rustic appeal.
  • Flamed: Yields a rough texture, ideal for slip resistance.

This well-rounded description of Osterloh Black Granite should help guide decisions in choosing the ideal material for specific architectural needs.

FAQ

Can Brazil's Osterloh Black Granite be used in heavy use areas?

Yes, Brazils Osterloh Black Granite can be used in heavy use areas. Granite is a naturally durable and resilient material, making it suitable for high-traffic areas. Osterloh Black Granite, specifically, is known for its strength and durability, making it an excellent choice for heavy use applications such as countertops, flooring, and even commercial installations. However, it is always a good idea to consult with a professional to assess the specific needs of your project and ensure the suitability of the material for its intended use.

What is the coefficient of friction of Water Jet Cut Brazil's Osterloh Black Granite tiles?

The coefficient of friction of Water Jet Cut Brazils Osterloh Black Granite tiles is not readily available as it can vary depending on factors such as surface finish and the specific conditions of the installation site. It is recommended to contact the manufacturer or supplier for more detailed information on the coefficient of friction of this specific product.

Can Brazil's Osterloh Black Granite be used in a office?

Yes, Brazils Osterloh Black Granite can be used in an office. It is a versatile and elegant material that can be used for office countertops, desk surfaces, flooring, or even decorative accent pieces such as wall panels. Osterloh Black Granites dark and uniform color with subtle white veining gives a sophisticated and professional look to any office setting.

Can Brazil's Osterloh Black Granite be used exterior applications in very windy climates?

Yes, Brazils Osterloh Black Granite can be used for exterior applications in very windy climates. Granite is known for its durability and ability to withstand harsh weather conditions, including wind, rain, and snow. However, it is always recommended to consult with a professional or supplier to ensure that the specific variety of Osterloh Black Granite is suitable for the intended outdoor application in a windy climate.

How thick is Brazil's Osterloh Black Granite slabs?

The thickness of Brazils Osterloh Black Granite slabs can vary, depending on the specific needs and preferences of the buyer. However, typical thicknesses for granite slabs range from 2 centimeters (3/4 inches) to 3 centimeters (1 1/4 inches).

What is the average compressive strength of Brazil's Osterloh Black Granite?

There is no widely reported average compressive strength specifically for Brazils Osterloh Black Granite. The compressive strength of granite can vary depending on the specific type and quality of the material. It is recommended to consult with granite suppliers or experts in the industry for more accurate information regarding the compressive strength of Osterloh Black Granite.

Are there color variations of Brazil's Osterloh Black Granite?

Yes, there are variations of Brazils Osterloh Black Granite available. While the base color is black, there can be subtle variations in the pattern and veining of the stone. Some slabs may have more prominent white or gray veining, while others may have a more consistent black appearance. Additionally, the level of polish can also affect the overall appearance of the granite. It is always recommended to view and select the specific slab in person to see the exact color variation before making a purchase.

What grade is Brazil's Osterloh Black Granite?

There is no specific grade for Osterloh Black Granite in Brazil as the grading system for granite varies by country and even within different regions of the same country. The grading of granite usually depends on factors like color consistency, texture, thickness, and overall quality. It is best to contact a Brazilian granite supplier or manufacturer for specific information on the grade of Osterloh Black Granite they offer.

Is Brazil's Osterloh Black Granite an expensive stone?

I do not have access to real-time pricing information on Brazils Osterloh Black Granite. However, the cost of a natural stone can vary depending on its quality, color, rarity, and patterns. Generally, high-quality natural stones like granite are more expensive due to their durability, strength, and unique appearance. It is recommended to check with a local stone supplier or fabricator for specific pricing information.

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