Purity graphene

When purchasing purity graphene, the most critical factor is the carbon content, which should ideally be >99% for high-end applications. You must also verify the number of layers (Single-layer, Few-layer, or Multi-layer) as this dictates electrical conductivity and mechanical strength. Additionally, check the Lateral Size (D50) and Specific Surface Area (SSA), typically ranging from 500 to 1500 m²/g, to ensure it meets your specific dispersion requirements.

Request a Raman Spectroscopy report to confirm the G-band and D-band ratios, which indicate the structural integrity and defect density. Furthermore, ask for TEM (Transmission Electron Microscopy) or AFM (Atomic Force Microscopy) images to validate the thickness and morphology. Reliable suppliers on Made-in-China.com should provide a Certificate of Analysis (COA) for every batch to ensure consistency in electrical conductivity and thermal stability.

Purity graphene is widely used in energy storage (enhancing Li-ion battery electrodes), conductive inks, and thermal management (heat dissipation films). It is also a key additive in polymer composites to improve tensile strength and in anti-corrosion coatings. For B2B buyers, it is essential to match the functionalization (e.g., Graphene Oxide vs. Reduced Graphene Oxide) to the specific chemical environment of the end product.

Ensure the supplier complies with REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) for the EU market and TSCA (Toxic Substances Control Act) for the US. Because graphene is a nanomaterial, the supplier must provide a comprehensive Material Safety Data Sheet (MSDS) highlighting handling protocols to prevent inhalation of fine particles, ensuring occupational health and safety compliance.

The main risks include material degradation due to improper sealing and customs delays caused by misclassification. Graphene is often subject to Strategic Trade Controls or dual-use export licenses. Always confirm the HS Code (typically 3801.90) with the supplier and ensure the packaging is vacuum-sealed and moisture-proof to prevent oxidation during long-transit sea freight.

Graphene pricing is highly sensitive to purity levels and production methods (e.g., CVD vs. Liquid Phase Exfoliation). For bulk orders, aim for a 15-25% discount by committing to an annual volume. On Made-in-China.com, look for 'Audited Suppliers' and request a small sample (1-5g) for lab testing before committing to a large MOQ. Negotiate staggered payment terms (e.g., 30% deposit, 70% after third-party inspection) to secure your capital.

For small high-value batches, Air Freight (DHL/FedEx) is preferred to minimize transit time and handling. For industrial volumes, Sea Freight is cost-effective but requires specialized palletizing to prevent compression of the powder. Ensure the shipment includes a Dangerous Goods Declaration if the graphene is functionalized with flammable solvents, and always utilize Trade Assurance services to protect the transaction.