Sulfurized isobutylene

When evaluating Sulfurized Isobutylene (SIB), the most critical parameters are Sulfur Content (typically 40-45%), Active Sulfur levels, and Viscosity. For extreme pressure (EP) additives, you must distinguish between active and inactive sulfur; active sulfur provides superior load-carrying capacity but may be corrosive to yellow metals like copper. Ensure the Flash Point is above 100°C for safety and that the Solubility in base oils is excellent to prevent precipitation during storage.

Verify that the supplier is ISO 9001 certified for quality management. Since this is a chemical product, compliance with REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) is mandatory for the EU market. Additionally, request a Technical Data Sheet (TDS) and a Material Safety Data Sheet (MSDS/SDS) that aligns with the GHS (Globally Harmonized System) to ensure safe handling and regulatory alignment in your local jurisdiction.

Sulfurized Isobutylene is primarily used as an Extreme Pressure (EP) additive in lubricant formulations. Key scenarios include Gear Oils (industrial and automotive), Metalworking Fluids (cutting and grinding), and Greases. It is valued for its ability to form a protective film under high-load conditions, preventing metal-to-metal contact and reducing wear in heavy-duty machinery.

Request Copper Strip Corrosion test results (ASTM D130) to determine the chemical's aggressiveness toward non-ferrous metals. You should also conduct compatibility tests with various base oils (Group I, II, or III) to ensure no haze or sediment forms. Professional buyers often ask for Four-Ball Wear Test data to validate the actual performance of the additive in a finished lubricant blend.

Sulfurized Isobutylene is often classified as a Class 9 Miscellaneous Dangerous Good or regulated under specific maritime codes due to its environmental impact. You must ensure the supplier provides UN-approved packaging (IBC tanks or steel drums). Failure to declare hazardous materials correctly can lead to heavy fines, shipment seizures, or port delays. Always use a freight forwarder experienced in DG (Dangerous Goods) logistics.

To mitigate risk, utilize Trade Assurance services or Letters of Credit (L/C) for large volumes. For quality assurance, hire a third-party inspection agency like SGS or Intertek to perform pre-shipment sampling and laboratory analysis. On platforms like Made-in-China.com, prioritize Audited Suppliers who have undergone on-site factory inspections to verify their production capacity and QC processes.

Chemical pricing is highly sensitive to raw material costs (isobutylene and sulfur) and petroleum price fluctuations. Negotiate based on a formula-based pricing model if signing a long-term contract. For spot purchases, leverage volume-based discounts; increasing your order from a few drums to a full 20ft container (FCL) can reduce unit costs by 15-25% due to optimized logistics and manufacturing efficiencies.

Ensure the HS Code (typically 3811.21 or 3811.29) is accurately declared to avoid tariff disputes. You must provide a Certificate of Analysis (COA) for every batch. Check if your country requires a Chemical Import License or specific environmental declarations. Providing the CAS Number (68511-50-2) clearly on all documentation will expedite the verification process by customs officials.