British brown granite is a highly sought-after material in the UK, commonly used for exterior walls, kitchen countertops, and other high-traffic areas. Its rich color and durability make it a popular choice for both residential and commercial projects.
Before any renovation or polishing work begins, the British brown stone should be thoroughly cleaned and ground to ensure a smooth surface. After grinding, a waterproofing treatment is applied, followed by sealing to minimize water absorption. If conditions allow, an additional layer of waterproofing can be added to further protect the stone.
For rough grinding, the granite is first grooved and then sealed before being ground with diamond resin blocks. The coarse grinding process should not use excessive water. After each pass, the surface is wiped clean, and the depth of the grind is checked. It's important to use 50# grinding discs and ensure the machine moves smoothly. Coarse grinding typically takes up about 45% of the total time and is crucial for achieving a high-quality finish.
Fine grinding comes next, starting with a waterproofed surface. A soft diamond resin sheet is used for this stage. This step accounts for approximately 35% of the overall process and can achieve a finish as fine as 2000#.
Before polishing, the granite must be at least 70% dry. A natural sealant is applied to fill in any gaps and strengthen the material. This not only improves the gloss but also enhances the surface density, providing a solid base for the final polish.
Polishing is done using a crystal machine with a power output of over 2HP. A special polishing compound, such as milk Q5, is used to bring out the shine. After polishing, the granite achieves a minimum gloss level of 90–100 degrees, giving it a sleek and elegant appearance.
In terms of physical properties, British brown granite has a bulk density of 2.97 g/cm³, compressive strength of 122.6 MPa, flexural strength of 17.4 MPa, and a water absorption rate of just 0.19%. Its Mohs hardness is 6.6, and its initial gloss is around 86.6°.
The layout of the stone features a warm red-brown tone with good luminosity, making it ideal for large-scale installations. The texture differences between blocks do not significantly affect the overall appearance. When opening the stone, the face shows a large pattern, while the side reveals a smaller one.
In terms of advantages, British brown granite is known for its biliary structure, which includes deep red, reddish, large-flower, and small-flower varieties. The color and pattern may vary slightly within the same mine, but the variety remains relatively stable. However, some common defects include black spots, black lines, red veins, uneven texture, inconsistent patterns, and cracks. The blocks are typically large, and in China, a preference exists for smaller brown patterns on a brown background.
This comprehensive treatment ensures that the granite maintains its beauty and durability for years to come.
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