Graphite crucibles price manufacturers

Selecting the correct grade is vital for cost-efficiency. Clay-graphite crucibles are generally more economical and suitable for lower-temperature melting of non-ferrous metals. However, for high-frequency induction furnaces or precious metal refining, silicon carbide (SiC) graphite crucibles are preferred due to their superior thermal conductivity, high mechanical strength, and resistance to chemical erosion. Always verify the carbon content (typically 30%-50%) to ensure it matches your specific melting point requirements.

Price is heavily influenced by bulk density (should be ≥1.7g/cm³) and porosity (should be ≤25%). A higher density indicates a longer service life and better resistance to metal penetration. Additionally, check the compressive strength (≥25MPa) to ensure the crucible can withstand the weight of heavy metal charges without cracking. Oxidation resistance coatings can also increase the initial price but significantly extend the product's lifespan, reducing the Total Cost of Ownership (TCO).

Graphite crucibles are primarily used in foundries, laboratories, and jewelry manufacturing. For industrial casting, the crucible must handle thermal shock—the ability to move from room temperature to 1600°C without fracturing. If you are melting aluminum, ensure the crucible has a glaze layer to prevent aluminum dross from sticking. For vacuum furnaces, high-purity isostatic graphite is required to prevent contamination of the melt.

Ensure the supplier adheres to ISO 9001:2015 for quality management. Request Material Safety Data Sheets (MSDS) and third-party lab reports confirming the ash content (ideally <0.1% for high-purity grades). For international trade, compliance with REACH or RoHS may be necessary if the crucibles are used in sensitive electronic component manufacturing. On Made-in-China.com, look for Audited Suppliers to ensure the factory has been physically verified.

The biggest risk is physical breakage due to brittleness. Graphite has low impact resistance. Ensure the supplier uses customized wooden crates with shock-absorbing foam or bubble wrap for each unit. Specify 'Fragile' labeling and consider CIF (Cost, Insurance, and Freight) terms so that the cargo is insured against damage during transit.

Graphite prices fluctuate based on raw petroleum coke and needle coke market rates. Negotiate based on volume tiers; typically, ordering a full pallet can reduce the unit price by 15-20%. Ask for a breakdown of the price, distinguishing between the material grade and the machining costs. On Made-in-China.com, you can compare multiple quotes to establish a market baseline before finalizing terms.

Always use secure payment methods provided by the platform to protect your funds until shipment is confirmed. For large bulk orders, implement a staged payment plan: 30% deposit and 70% balance after a pre-shipment inspection (PSI). Hiring a third-party inspector to verify the dimensions and surface integrity before the goods leave the factory is a standard industry safeguard.

Graphite is sometimes classified as a dual-use material depending on its purity and size. Check the HS Code (typically 690310) against your country's import tariff schedule. Be aware of any anti-dumping duties that may apply to graphite electrodes or specialized carbon products in your region to avoid unexpected costs at the border.