Olivine sand

When selecting Olivine Sand, the most critical factor is the Magnesium Oxide (MgO) content, which should ideally be between 45% and 49% for high-heat applications. You must also verify the refractoriness, as quality olivine should withstand temperatures up to 1700°C - 1800°C. Additionally, check the Loss on Ignition (LOI); a low LOI (typically <1%) indicates high purity and minimal volatile impurities, which is essential for preventing gas defects in foundry casting.

The choice of grain size depends on your specific industrial process. For foundry casting, a finer grade (e.g., AFS 60-90) is preferred to achieve a smooth surface finish on metal parts. For sandblasting or waterjet cutting, coarser grains are required for better abrasive power. For refractory gunning mixes or EBT (Electric Arc Furnace) tap hole filling, a specific graded distribution is necessary to ensure proper packing density and flowability.

One of the primary advantages of Olivine is that it is free of breathable crystalline silica, making it a safer alternative to silica sand. Ensure the supplier provides a Material Safety Data Sheet (MSDS) confirming the absence of hazardous asbestos-form minerals. For international trade, look for ISO 9001 certification for quality management and ISO 14001 for environmental responsibility, especially if the sand is used in ecological applications like CO2 sequestration or water filtration.

Request a chemical analysis report (XRF) to check for low levels of Fe2O3 (Iron Oxide) and CaO (Calcium Oxide), as high concentrations can lower the melting point and affect chemical neutrality. For abrasive use, ask for the Mohs hardness rating, which should be approximately 6.5 to 7.0. Conduct a pH test; Olivine is naturally basic/alkaline, which makes it ideal for manganese steel casting as it prevents chemical reactions between the mold and the metal.

The biggest risk is moisture contamination during sea transit, which can cause clumping and render the sand unusable for precision casting. Always insist on waterproof jumbo bags (FIBCs) with inner liners. Another risk is weight discrepancies; ensure the contract specifies that the final weight is determined by a third-party surveyor (like SGS) at the loading port to avoid disputes upon arrival.

Since Olivine Sand is a heavy bulk commodity, freight costs often exceed the product value. Negotiate based on FOB (Free On Board) terms if you have a reliable freight forwarder, or CIF (Cost, Insurance, and Freight) if you want the supplier to handle the risk until it reaches your port. For bulk orders exceeding 100 tons, aim for a volume discount of 10-15%, and always use Made-in-China.com's secured payment services to protect your funds until the Bill of Lading is issued.

Request that the supplier uses UV-stabilized 1.0 to 1.5-ton jumbo bags to prevent tearing during crane handling. For storage, the sand must be kept in a dry, covered warehouse; even minor humidity can affect the flow rate in automated sand-feeding systems. If shipping to countries with strict agricultural inspections (like Australia or the USA), ensure the pallets are ISPM 15 heat-treated to avoid customs delays.