Industrial technical requirements for granite vary depending on the intended application. Whether it's used in construction, flooring, or decorative purposes, specific standards must be met to ensure quality and durability. 1. Main Requirements for Natural Granite Blocks: According to the building materials industry standard (JC-204-92), natural granite blocks must meet several key criteria. First, the block should have a right-angled parallelepiped shape, with the largest face aligned parallel to the rock’s joint surface or pattern. This ensures structural integrity and ease of use during installation. The dimensions of the block are also strictly defined. The length must be at least 140 cm, while the width and height should each be no less than 60 cm. These size requirements help maintain consistency and usability in large-scale applications. In terms of appearance, the color, pattern, and grain structure of the same batch should be uniform. Additionally, the corners, edges, cracks, color lines, and stains must comply with the specifications outlined in Table 4.24.6. This ensures that the visual appeal and structural soundness of the granite remain consistent across all pieces. Physical performance is another critical factor. The density must be at least 2.50 g/cm³, water absorption should not exceed 1.0%, and the dry compressive strength needs to be no less than 60.0 MPa. The bending strength should be at least 8.0 MPa. These properties make granite a strong and long-lasting material suitable for a wide range of uses. 2. Quality Requirements for Acid and Alkali-Resistant Granite: (1) Acid-Resistant Granite: The main chemical composition includes SiOâ‚‚ between 70% and 75%, which directly affects acid resistance. Higher SiOâ‚‚ content improves the stone’s ability to withstand acidic environments. Other components include Alâ‚‚O₃ (13–15%), Feâ‚‚O₃ (less than 0.5%), CaO (less than 0.8%), and Mg (less than 0.4%). The acid resistance should be over 97.5%. It also has a thermal resistivity of more than 16.2 MPa after 10 to 40 thermal cycles, a melting point of 1610°C, an expansion coefficient below 8×10â»Â³, and a water absorption rate of less than 1.5%. (2) Alkali-Resistant Granite: For alkali resistance, higher levels of CaO and MgO are preferred. Some acid-resistant stones with low porosity can also serve as alkali-resistant materials. For example, granite produced by Qingdao Stone Factory contains 76.6% SiOâ‚‚, 14.39% Alâ‚‚O₃, 9.07% (Kâ‚‚O + Naâ‚‚O), 1.14% Feâ‚‚O₃, 1.34% CaO, and 0.68% MgO. This composition makes it highly resistant to both acid and alkali environments. Power Plant Pump Power Plant Pump,Boiler Feed Pump,Anti-Corrosion Pump,Centifugal Pump Shenyang pump products sales co., LTD , https://www.syipsc.com