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Viscosity Index Improvers (OCP and PMA)
OCP and PMA viscosity index improvers in liquid, solid, bale and pellet form, SSI 18 to 50, for engine, gear and hydraulic oils. Request a TDS or quote.
Viscosity index improvers (VIIs) stop an oil from thinning too much as it heats up, so one oil can meet a multigrade such as 10W-40 or 15W-40. Chempol supplies olefin copolymer (OCP) and polymethacrylate (PMA) viscosity index improvers to lubricant blenders in more than 30 countries.
Choose by chemistry, shear stability and form. OCP grades are the usual choice for engine oils, and VISCOMAX is a concentrated liquid OCP for multigrade gasoline and diesel engine oils. PMA suits hydraulic, transmission and gear oils, where low-temperature flow matters, and CHEMPOL 5403 meets the sonic shear stability requirements for shock absorber oils. A lower shear stability index (SSI) means the polymer loses less of its thickening under shear, while higher-SSI grades give more thickening per kilo. Liquid grades are ready to blend; solid grades (granules, bales and pellets) are dissolved in base oil first.
| Product | Chemistry | Form | SSI (typical) | Main use |
|---|---|---|---|---|
| Liquid OCP Viscosity Index Improver, Low SSI – CHEMPOL 5026 | Ethylene-propylene copolymer (OCP) in carrier fluid. | Liquid | 22 | Multigrade engine oils, SAE 5W-30 to 20W-50; industrial oils. |
| Low SSI OCP Viscosity Index Improver (Bale) – CHEMPOL 5510 | Amorphous ethylene-propylene copolymer (OCP). | Bale | 22 | Multigrade engine and industrial oils. |
| Shear-Stable OCP Viscosity Index Improver (Solid) – CHEMPOL 5530 | OCP, 66 wt% ethylene. | Solid granules | 24 | Mono- and multigrade engine oils, industrial oils. |
| Shear-Stable OCP Viscosity Index Improver (Bale) – CHEMPOL 5550 | OCP | Bale | 24 | Mono- and multigrade engine oils, industrial oils. |
| OCP Viscosity Index Improver Pellets – CHEMPOL P20 | Linear ethylene-propylene copolymer (OCP). | Pellets | 45–50 | Mono- and multigrade crankcase oils, industrial oils. |
| Ethylene-Propylene Viscosity Index Improver Pellets – CHEMPOL P25 | Ethylene-propylene copolymer, 48 wt% ethylene. | Pellets | 45–48 | Mineral-oil crankcase and industrial oils. |
| PMA Viscosity Index Improver (Liquid) – CHEMPOL 5403 | Polymethacrylate (PMA). | Liquid | 18 | Hydraulic, transmission, gear, UTTO wet-brake and shock absorber oils. |
| Highly Concentrated Viscosity Index Improver – VISCOMAX | Ethylene-propylene copolymer (OCP), solubilized. | Liquid concentrate | 24 | Multigrade gasoline and diesel engine oils. |
| Concentrated Viscosity Index Improver – VISCOPOLY 1000 | [CONFIRM from TDS: chemistry, form, SSI] | Concentrated VI improver. |
Not sure which grade fits? Send us your base oil and target grade.
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FAQs
A: It reduces how much an oil thins as its temperature rises. That lets one oil meet a multigrade such as 15W-40 and keeps a thicker oil film at operating temperature.
A: VIIs keep lubricants stable at both high and low temperatures. This stability, therefore, eliminates breakdowns and assures that machinery and engines work effectively under different conditions.
A: VIIs are made from polymer molecules that expand with rising temperatures but shrink with lower temperatures. This action and behaviour maintains the lubricant's viscosity, ensuring it doesn't thin out in the heat or become too thick in the cold.
A: VIIs are essential in the automotive, aviation, heavy-duty machinery, and manufacturing industries, where consistent lubricant performance is required for equipment longevity and efficiency.
A: VIIs are compatible with most lubricant types, including engine, hydraulic, and industrial oils. However, specific formulations may vary depending on the application.
A: VIIs help reduce friction, minimise wear, and protect equipment components from damage by maintaining optimum lubrication across temperature ranges.
A: Chempol offers eco-friendly VIIs designed to meet environmental standards. These products are developed to minimise environmental impact while ensuring high performance.
A: The right VII is based on considerations such as operating temperatures, type of lubricants used, and applications. Chempol's staff will be more than happy to recommend the right product to meet your specific requirements.
A: VII’s may improve the fuel economy of engines and equipment by ensuring proper lubrication, reducing friction, and improving overall performance.
A: Chempol is a trusted leader in chemical additives. We provide high-quality, reliable VIIs for various industrial and automotive applications. Our products are designed to provide superior performance and value.
A: OCP grades (CHEMPOL 5026, 5510, 5530, 5550, P20, P25 and VISCOMAX) are the usual choice for engine oils. PMA (CHEMPOL 5403) suits hydraulic, transmission, gear, wet-brake and shock absorber fluids, where low-temperature flow and controlled shear stability matter more.
A: The shear stability index is the share of a polymer's thickening that is lost in a standard shear test (ASTM D6278). Lower values, around 18–24, hold viscosity better; values around 45–50 give more thickening per kilo.
A: It depends on your base oil and target grade. Where a TDS gives treat rates by SAE grade, use them as a starting point, and send us your base oil and target grade for a recommendation.
A: Product pages link to the TDS. [CONFIRM: samples on request? If yes: "Samples are available on request."] Ask through the contact form or the Get a Quote button.
