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Home› Products› Lubricant Additives› PMA Viscosity Index Improver
Lubricant Additives

PMA Viscosity Index Improver

Polymethacrylate (PMA) viscosity index improvers for hydraulic oils, automotive gear oils, automatic transmission fluids, and arctic-grade lubricants, combining high VI, excellent shear stability, and outstanding low-temperature performance.

Viscosity IndexPMAShear StabilityHydraulic OilATFGear OilArctic Grade
Chemistry
Polymethacrylate (PMA)
Key Parameters
KV @100°C, PSSI / SSI
Applications
Hydraulic Oils, Gear Oils, ATF
Range
Standard to Arctic Grade

Overview

Polymethacrylate (PMA) viscosity index improvers are coil-polymer additives that reduce the rate of viscosity change with temperature, enabling multi-grade lubricants to perform across wide temperature ranges. At low temperatures, the coiled polymer occupies minimal volume; at high temperatures, it expands and increases the effective viscosity of the base oil, raising the VI. PMA is particularly valued for its excellent low-temperature performance (MRV and Brookfield viscosity) compared to OCP-type VII, making it the preferred choice for hydraulic fluids, automotive gear oils, ATF, and arctic-grade lubricants. Shear stability (PSSI or SSI) is a critical selection parameter. High-shear-stability grades are required for automotive gear oils and ATF, while lower PSSI grades are used where thickening efficiency is paramount.

Hydraulic Oil Grades

ChemistryKV @100°C (mm²/s)PSSI / SSI
PMA Viscosity Index Improver (Hydraulic, Standard)1100–1850SSI: 38 (KRL 20h)
PMA Viscosity Index Improver (Hydraulic)698PSSI: 38 (KRL 20h)
PMA Viscosity Index Improver (Hydraulic)800SSI: 38 (KRL 20h)
PMA Viscosity Index Improver (Hydraulic, High VI)1450PSSI: 65 (KRL 20h)

Arctic / Cold Climate Grades

ChemistryKV @100°C (mm²/s)PSSI / SSI
PMA Viscosity Index Improver (Arctic)1500PSSI: 25 (KRL 20h)
PMA Viscosity Index Improver (Arctic)1300PSSI: 35 (KRL 20h)
PMA Viscosity Index Improver (Arctic, Very Cold)850PSSI: 50 (KRL 20h)
PMA Viscosity Index Improver (Arctic, Very Cold)770PSSI: 65 (KRL 20h)

Automotive Gear Oil Grades

ChemistryKV @100°C (mm²/s)PSSI / SSI
PMA Viscosity Index Improver (Gear Oil, High Shear Stability)460SSI: 22 (KRL 20h)
PMA Viscosity Index Improver (Gear Oil)700SSI: 29 (KRL 20h)
PMA Viscosity Index Improver (Gear Oil, Cost-effective)775PSSI: 40 (KRL 20h)

ATF / Driveline Grades

ChemistryKV @100°C (mm²/s)PSSI / SSI
PMA Viscosity Index Improver (ATF)575PSSI: 10 (KRL 20h)
PMA Viscosity Index Improver (ATF, Dispersant Type)700PSSI: 35 (KRL 20h)
PMA Viscosity Index Improver (ATF, High Shear Stability)700PSSI: 42 (KRL 20h)
PMA Viscosity Index Improver (Multi-grade Engine Oil)1250PSSI: 12 (Bosch 30 cycles)

Related Products

PMA Pour Point Depressant →ZDDP →High-temp Anti-oxidant →