OCP Olefin Copolymer (CAS 9010-79-1) – Viscosity Index Improver Additive | China Manufacturer & Bulk Supplier

🚗 1. Multi-Grade Engine Oils - Fuel Efficiency & Cold-Start Protection

OCP Olefin Copolymer is the dominant VII in global engine oil production, used extensively in 0W-20, 5W-30, 5W-40, and 10W-50 multi-grade formulations. Its exceptional thickening efficiency means formulators can achieve target viscosity grades with lower treat rates than competing polymers, delivering direct cost savings per finished oil batch. At cold temperatures the tightly coiled polymer chains allow fast oil flow to critical engine surfaces during start-up, reducing cold-start wear. At operating temperature the expanded chains maintain an adequate lubricating film thickness, preventing metal contact on pistons, crankshaft bearings, and camshafts.

Dispersant-type OCP (D-OCP) incorporates polar functional groups that suspend soot and oxidation by-products, helping maintain engine cleanliness and supporting API SP / ACEA C5 compliant extended drain interval formulations. China suppliers offer a full range of SSI grades (SSI 10–55) to match diverse engine oil specifications.

⚙️ 2. Industrial Gear Oils & Hydraulic Fluids - Heavy-Duty Performance

Industrial gearboxes, hydraulic systems, and turbines demand lubricants that hold their viscosity under extreme mechanical and thermal stress. OCP's superior shear stability - the best among all VII polymer types - makes it the preferred choice for high-pressure hydraulic fluids (ISO VG 32–68) and heavy-duty industrial gear oils (ISO VG 220–680). It ensures consistent viscosity across wide temperature ranges, maintaining precise actuator response in hydraulic circuits and reliable gear film thickness under boundary lubrication conditions. China manufacturers produce high-SSI-stability OCP grades specifically engineered for these demanding industrial environments.

🔄 3. Transmission Fluids & Specialty Lubricants - ATF, CVTF & Marine Oils

OCP is widely used in automatic transmission fluids (ATF), continuously variable transmission fluids (CVTF), and marine engine oils where high shear stability is non-negotiable. Marine diesel engine oils in particular demand VII polymers that survive the aggressive shear conditions of large two- and four-stroke engines while maintaining adequate viscosity throughout long drain intervals at sea. OCP's resistance to permanent viscosity loss under high-shear conditions makes it significantly more reliable in these applications than lower-SSI polymer alternatives. Customized OCP grades with tailored molecular weight distributions are available from China suppliers for specific OEM ATF and marine oil specifications.

OCP is typically traded in 25 kg bags (solid) or 200 L drums / IBC totes (liquid). Volume pricing tiers activate at 1MT, 5MT, and 20MT+. Benchmark treat-rate efficiency - not just unit price - since a higher-SSI-stability grade may allow lower dosage, reducing total formulation cost per liter of finished lubricant. Long-term supply agreements with fixed-volume commitments unlock priority allocation during ethylene/propylene feedstock tightness periods.

Q1: What is the CAS number for OCP Olefin Copolymer?

The CAS number is 9010-79-1 for ethylene-propylene copolymer (OCP / EPM). It is also referred to as Ethylene Propylene Copolymer (EPC), Olefin Copolymer VII, or OCP viscosity modifier in industry literature. Please specify your target SSI grade and physical form (solid granules vs. liquid concentrate) when requesting a quotation.

Q2: What is the difference between solid OCP and liquid OCP concentrate?

Solid OCP (granular pellets or crumbs, typically 40–60% polymer content) requires dissolution in base oil at 80–100°C before blending. It offers lower shipping costs per unit of active polymer and longer shelf life. Liquid OCP concentrate (typically 10–15% polymer in base oil) is pre-dissolved and ready to blend at ambient temperature, reducing blending complexity and energy consumption, ideal for smaller blending operations or where heating equipment is unavailable.

Q3: What SSI grade should I choose for a 5W-30 engine oil formulation?

For passenger car 5W-30 (PCMO), SSI grades of 25–45 are typical, balancing thickening efficiency with long-term viscosity retention. For heavy-duty diesel engine oils (HDEO) where shear stability is paramount, SSI ≤ 20 grades are preferred. Our technical team can recommend the optimal SSI / treat-rate combination for your specific base oil and target viscosity grade.

Q4: Does OCP also depress pour point like PMA?

No. OCP does not inherently depress pour point - a separate Pour Point Depressant (PPD) additive is required in multi-grade engine oil and low-temperature hydraulic fluid formulations. This is one key advantage of PMA over OCP. However, for high-volume cost-sensitive applications where pour point is managed by the PPD package, OCP's superior thickening efficiency and shear stability make it the economically preferred VII choice.

Q5: What documentation is available for import and quality verification?

Sinolook provides a complete documentation package with every shipment: Certificate of Analysis (CoA), Safety Data Sheet (SDS/MSDS), commercial invoice, packing list, Bill of Lading, and Certificate of Origin. Third-party inspection reports (SGS, Intertek, BV) and REACH compliance documentation are available upon request.