CAS 68511‑50‑2

Sulfurized isobutylene (commonly known as SIB or T321) is an organosulfur polysulfide-based synthetic additive produced by high-pressure catalytic reaction of isobutylene and sulfur feedstocks. This amber-to-pale-yellow transparent oily liquid has high active-sulfur content and outstanding solubility in both mineral and synthetic base oils. It acts as a core extreme-pressure anti-wear component widely formulated into gear oils, metal-working fluids and lubricating-grease systems.

This organosulfur additive achieves its tribological performance through its variable polysulfide-bond molecular framework. Under high-load conditions with frictional heat, its carbon-sulfur covalent bonds gradually cleave, releasing reactive sulfur species that react with steel surfaces to form dense iron-sulfide protective films. This barrier prevents direct metal-on-metal contact and effectively mitigates scuffing, seizure and welding of friction pairs under shock-loading operating conditions. Unlike many competing sulfur-based EP additives, SIB manufactured via high-pressure synthesis contains no chlorine. This eliminates corrosive chloride-derived by-products and yields well-controlled copper-corrosion performance when applied within recommended treat-rate ranges.

Commercial-grade sulfurized isobutylene is supplied as pale-yellow to amber transparent oily liquid. Its typical active-sulfur content ranges from 40 % to 46 %, a key metric that directly determines the extreme-pressure load-bearing capacity of finished lubricants. It exhibits excellent miscibility with mineral oils, synthetic hydrocarbons and ester-based base oils, with no precipitate formation during long-term storage. As an ashless additive, it leaves virtually no solid residual deposits after thermal decomposition. It is widely used in automotive GL-5 gear oils, heavy-duty industrial gear lubricants, anti-wear hydraulic fluids, multiple cutting and metal-forming fluids, and extreme-pressure lubricating greases. Formulation specialists frequently blend it with ZDDP or sulfonate detergents to achieve balanced overall performance for heavy-duty mechanical equipment including mining gearboxes and wind-turbine drive assemblies.

As a trusted chemical supply-chain provider, we enforce strict quality-control protocols for sulfurized isobutylene. Our industrial-grade material maintains stable active-sulfur values, tightly controlled chlorine residues, and compliant flash-point and copper-corrosion indices. Carefully sourced raw feedstock combined with closed high-pressure synthesis, refining and filtration workflows minimizes batch-to-batch variation. Consistent physicochemical specifications prevent performance drift that could otherwise result in insufficient extreme-pressure protection or unexpected non-ferrous-metal corrosion for downstream lubricant manufacturers.

Purchasers gain tangible practical benefits by selecting our supply. First, consistent product specifications reduce repeated laboratory formulation validation for your technical teams and cut raw-material waste from trial-and-error during continuous large-scale lubricant blending. Second, we provide comprehensive export-oriented documentation including COA and MSDS to streamline cross-border customs clearance and corporate safety-audit workflows. Third, flexible packaging options support small-batch formula-trial orders as well as high-volume bulk-industrial procurement. Our technical team can share practical guidance on recommended treat-rates and formula compatibility when customers encounter real-world formulation challenges.

We fully understand overseas buyers' core concerns regarding product stability, document completeness and safe transportation. Store this organosulfur oily liquid in sealed containers within cool, dry, well-ventilated warehouse premises. Isolate it from strong oxidizing agents and excessive heat sources to avoid polysulfide-bond degradation. Every shipment undergoes pre-shipment inspection prior to dispatch. We have extensive export experience with lubricant-related fine chemicals and maintain long-term stable partnerships with lubricant and metal-working-fluid manufacturers worldwide. This proven track-record demonstrates our reliable supply capabilities.

If you are sourcing qualified industrial-grade Sulfurized Isobutylene (SIB / T321) for gear-oil compounding, metal-working-fluid production or lubricating-grease-formulation projects, please submit your inquiry. Kindly specify your target sulfur-content specification, packaging requirements and order volume. Our sales-technical team will respond within 24 hours and deliver a competitive quotation together with complete supporting-document sets. Laboratory-evaluation samples are available upon request.

Contact us: E-mail：xima777@ximachem.com Tel：+8617356006695

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