Diethylene glycol

Buyers must prioritize purity levels, typically requiring a minimum of 99.5% to 99.8% for industrial applications. Key parameters include moisture content (max 0.1%), color (max 10-15 Pt-Co units), and acidity (calculated as acetic acid, max 0.005%). For specialized uses like unsaturated polyester resins or brake fluids, ensure the distillation range is strictly within 242°C to 250°C to guarantee chemical stability.

As a chemical product, DEG must be accompanied by a comprehensive Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) compliant with the GHS (Globally Harmonized System). For the EU market, REACH registration is mandatory. If the DEG is intended for food-contact packaging or pharmaceutical excipients, it must meet USP/NF or FCC (Food Chemicals Codex) standards, although DEG is strictly regulated due to toxicity risks.

Request a Certificate of Analysis (COA) for every specific batch before shipment. It is highly recommended to engage third-party inspection services like SGS or Intertek to perform pre-shipment sampling and testing. Focus on the diethylene glycol content vs. ethylene glycol impurities, as high levels of monoethylene glycol (MEG) or triethylene glycol (TEG) can significantly alter the final product's viscosity and reaction rates.

DEG is primarily used as a chemical intermediate in the production of unsaturated polyester resins (UPR), polyurethanes, and plasticizers. It also serves as a high-efficiency solvent for nitrocellulose, resins, and dyes. In the textile industry, it acts as a hygroscopic agent for printing pastes, while in the construction sector, it is utilized as a grinding aid for cement clinker to improve flowability.

DEG is typically transported in ISO Tanks for bulk orders or 230kg HDPE/Steel drums for smaller volumes. Ensure the supplier uses nitrogen blanketing during loading to prevent oxidation and moisture absorption. When shipping to countries with strict environmental laws, verify that the packaging meets UN-certified standards for liquid chemicals to avoid customs delays or fines.

Utilize Trade Assurance services provided by reputable platforms like Made-in-China.com to protect your payment until delivery is confirmed. For large-scale contracts, consider Letter of Credit (L/C at sight) to ensure the supplier meets all documentation and quality requirements before funds are released. Always verify the supplier's Export License for hazardous or regulated chemicals.

DEG prices are highly sensitive to crude oil fluctuations and the ethylene oxide supply chain. Avoid suppliers offering prices significantly below the ICIS or Platts market benchmarks, as this often indicates recycled or off-spec material. Negotiate based on formula-pricing tied to raw material indices if you are establishing a long-term procurement contract to manage price volatility.

DEG is toxic if swallowed and must be strictly separated from food-grade products during storage and transit. Ensure your warehouse complies with local fire safety and chemical storage regulations, as DEG is combustible. Suppliers must provide clear labeling in the destination country's language, including hazard pictograms and emergency response instructions.