Diphenyl guanidine

Diphenyl Guanidine (DPG) is primarily used as a secondary accelerator in the rubber industry. It functions as a medium-speed accelerator for natural and synthetic rubbers, particularly when used alongside thiazoles or sulfenamides to increase the vulcanization rate and improve the tensile strength and elasticity of the final product. It is also widely utilized as a standardizing agent for acids in analytical chemistry due to its high purity and stable alkaline properties.

Buyers must verify the Purity (typically ≥98%), Melting Point (initial M.P. ≥144.0°C), and Ash Content (≤0.3%). For rubber applications, the Oil Content (for oiled powders, usually 1-2%) is critical to prevent dust explosions and improve dispersibility in the rubber mix. Ensure the sieve residue (150μm) is minimal to avoid structural defects in the finished rubber goods.

As a chemical substance, DPG must be accompanied by a comprehensive Material Safety Data Sheet (MSDS/SDS). It must comply with REACH regulations for the EU market and TSCA for the US. Because it is classified as environmentally hazardous (UN3077), suppliers must provide certification for IMDG (International Maritime Dangerous Goods) compliance to ensure legal and safe international transit.

DPG acts as a mild antioxidant, providing rubber products with excellent aging resistance compared to other basic accelerators. However, it can cause discoloration, so it is generally not recommended for white or brightly colored rubber products unless specifically formulated with non-staining stabilizers.

DPG is often classified as a Class 9 Dangerous Good (Environmentally Hazardous Substance). Buyers must ensure the supplier uses UN-approved packaging (such as woven bags with PE liners or fiber drums). You should verify that the freight forwarder is licensed to handle hazardous chemicals to avoid customs seizures or heavy fines at the port of entry.

Utilize the Secured Trading Services provided by Made-in-China.com to protect your payment. Always request a Pre-shipment Inspection (PSI) from third-party agencies like SGS or Intertek to verify that the chemical composition and moisture levels match the COA (Certificate of Analysis) before the final balance is paid.

DPG prices are heavily influenced by the cost of raw materials like aniline and carbon disulfide. Negotiate based on volume-based pricing tiers; for example, ordering in full container loads (FCL) can reduce unit costs by 10-15% compared to LCL. Ask for a fixed-price contract for 6-12 months if you have stable demand to hedge against chemical market volatility.

Check the HS Code (typically 292529) for specific import duties in your country. Be aware of anti-dumping duties that may apply to rubber accelerators in certain regions. Ensure the supplier provides a Certificate of Origin to take advantage of any Free Trade Agreements (FTAs) that could lower your total landed cost.