Divinylbenzene

When purchasing Divinylbenzene, the most critical factor is the purity level (typically 55%, 63%, or 80%). You must verify the Ethylvinylbenzene content, as it is the primary byproduct. For high-end applications like ion-exchange resins or chromatography, low polymer content and precise inhibitor levels (usually TBC - Tertiary-butylcatechol) are essential to prevent premature polymerization during transport and storage.

Buyers should request a Certificate of Analysis (COA) for every batch. Key performance indicators include refractive index, specific gravity, and color (APHA). Ensure the supplier uses refrigerated containers (reefers) if the transit time is long or the ambient temperature exceeds 25°C, as DVB is thermally sensitive and can undergo exothermic self-polymerization.

As a hazardous chemical, DVB must have a comprehensive Safety Data Sheet (SDS) compliant with GHS standards. For export, ensure the supplier provides REACH registration (for EU markets) or TSCA compliance (for the US). The product must be classified under UN Number 1993 (Flammable liquid, n.o.s.) or similar, depending on the specific blend and flash point.

DVB is primarily used as a cross-linking agent. Grade 55% is standard for ion-exchange resins and water treatment. Grade 80% is preferred for specialty polymers, coatings, and rubber chemicals where high cross-linking density is required. Understanding the end-use is vital for determining the economic feasibility of higher purity grades versus standard industrial grades.

DVB is classified as Dangerous Goods (DG). You must ensure the supplier is experienced in Class 3 Flammable Liquid handling. Use ISO Tanks for bulk liquid or UN-approved steel drums for smaller quantities. It is mandatory to maintain temperature control and monitor inhibitor depletion; if the inhibitor level drops too low, the entire shipment could solidify, leading to total loss.

Utilize secure payment methods and consider third-party pre-shipment inspections (such as SGS or Intertek) to verify purity and drum integrity. When sourcing via Made-in-China.com, prioritize Audited Suppliers who have verified production capacities and chemical export licenses to ensure transaction security and regulatory alignment.

DVB prices are heavily influenced by Styrene monomer feedstock costs. To secure better pricing, consider long-term off-take agreements rather than spot-buying. Negotiate based on Incoterms 2020 (FOB or CIF) and ask for volume-based discounts; typically, orders exceeding 10-20 metric tons allow for a 5-10% reduction in unit price.

The most common delay is incorrect HS Code classification or missing Dangerous Goods Declarations. Ensure the HS Code (typically 2902.90) matches local tariff schedules. Provide clear labeling in the destination country's language as per local chemical safety laws to avoid port seizures or heavy fines.