Graphene powder

Buyers must prioritize Specific Surface Area (SSA), typically ranging from 50 to 1000 m²/g, and Lateral Size, which influences dispersibility. The Carbon Content should ideally be >98% to ensure high conductivity. Additionally, verify the Number of Layers; true graphene consists of 1-10 layers, while products with more layers are classified as graphite nanoplatelets, which have different physical properties.

Request Raman Spectroscopy reports to confirm the G/D band ratio, which indicates structural integrity. Transmission Electron Microscopy (TEM) or Scanning Electron Microscopy (SEM) images are essential to visualize flake morphology. Furthermore, ask for X-ray Diffraction (XRD) data to ensure the absence of graphite impurities and to confirm the exfoliation quality.

For Energy Storage (Batteries/Supercapacitors), high electrical conductivity and high SSA are critical. In Polymer Composites, look for Surface-Functionalized Graphene (e.g., -OH, -COOH groups) to improve interfacial bonding. For Conductive Coatings, the Oxygen Content must be strictly controlled (usually <5%) to maintain low sheet resistance.

Ensure the supplier provides a comprehensive Material Safety Data Sheet (MSDS), as graphene is a fine powder that poses inhalation risks. Compliance with REACH (EU) or TSCA (USA) is often necessary for chemical substance importation. Additionally, check for ISO/TS 80004-13 standards which define the terminology and characteristics of graphene and related 2D materials.

The most significant risk is Product Substitution, where low-grade graphite powder is sold as high-quality graphene. To mitigate this, use Third-Party Inspection services like SGS or Intertek to sample the batch before final payment. Another risk is Moisture Absorption during sea transit; ensure the supplier uses Vacuum-Sealed, Anti-Static Aluminum Foil Packaging.

Graphene pricing is highly sensitive to Purity and Production Method (CVD vs. Liquid Phase Exfoliation). For bulk orders, aim for a 15-25% discount on the sample price. Negotiate a Tiered Pricing Structure based on annual volume rather than single-order volume. On Made-in-China.com, look for 'Diamond Members' or 'Audited Suppliers' to ensure you are dealing with established factories rather than small trading intermediaries.

Graphene is often classified under HS Code 3801.90 (Other Graphite). Because it is a nano-material, some customs authorities may require a Non-Hazardous Goods Declaration. For shipping to the US or Europe, ensure the Commercial Invoice clearly states the technical grade and intended use to avoid lengthy customs holds. Air Freight is recommended for high-value, low-volume graphene to minimize environmental exposure.

Always utilize Escrow-based payment systems or Trade Assurance services provided by platforms like Made-in-China.com to protect your funds until delivery is confirmed. Avoid direct wire transfers (T/T) to personal accounts. For large-scale industrial contracts, consider a Letter of Credit (L/C) to ensure payment is only released upon the presentation of compliant shipping and quality documents.