Dolomite brick

When evaluating Dolomite Bricks, prioritize the MgO (Magnesium Oxide) and CaO (Calcium Oxide) content, typically ranging from 40% to 60% each depending on the application. High-quality bricks must exhibit a bulk density of at least 2.85 g/cm³ and a cold crushing strength (CCS) exceeding 50 MPa. For cement rotary kilns, ensure the bricks have excellent coating-adherence properties, which protect the lining from thermal shock and chemical erosion.

Dolomite Bricks are highly sensitive to moisture; the free lime (CaO) reacts with water vapor, leading to structural disintegration (slaking). You must verify that the supplier uses vacuum-sealed plastic packaging and includes desiccants in every pallet. Ensure the manufacturer applies a paraffin or specialized resin coating on the brick surface to extend shelf life during sea freight and warehouse storage.

Suppliers should provide test reports aligned with ISO 1109:1975 for refractory classification. For international trade, request ASTM C416 standards for silica-alumina-magnesia classifications and ISO 9001:2015 for quality management. If sourcing from China, ensure products meet GB/T 2273 (Magnesia-dolomite bricks) to guarantee chemical consistency and dimensional accuracy.

These bricks are essential for the burning zones of cement rotary kilns and AOD/VOD refining furnaces in steelmaking. Their primary function is to provide superior resistance to basic slags and high-temperature stability. Unlike chrome-magnesite bricks, dolomite-based refractories are environmentally friendly (hexavalent chromium-free), making them the preferred choice for companies adhering to Green Manufacturing initiatives.

The most significant risk is product hydration during transit. If the container seal is compromised or humidity is high, the bricks may arrive crumbled. Always stipulate 'Moisture-proof packaging' in the contract and consider Third-Party Inspection (TPI) by agencies like SGS or Intertek at the loading port to verify the integrity of the vacuum seals before the vessel departs.

Focus on the Total Cost of Ownership (TCO) rather than just the unit price. Negotiate for tiered pricing based on annual volume and request a performance guarantee (e.g., kiln life hours). For first-time buyers, use Made-in-China.com's Secured Trading Service to ensure payment is only released after the goods pass the quality inspection and bill of lading (B/L) requirements are met.

Dolomite bricks are high-density and heavy; ensure the supplier uses fumigated wooden pallets with steel strapping and corner protectors to prevent shifting. Since these are often shipped in 20GP containers to maximize weight capacity, confirm that the supplier is experienced in container weight distribution to avoid fines at the port or damage during crane handling.

Check for Anti-Dumping Duties (ADD) in your specific region (e.g., EU or India) regarding refractory ceramic products. Ensure the supplier provides a Certificate of Origin (CO) to benefit from any Free Trade Agreements (FTA) that might reduce import tariffs. Always clarify the HS Code (typically 690210) to ensure accurate customs declaration and duty calculation.