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Base Oil Group 

Base Oil Group 

Typical Properties of Each Base Oil Group

Characteristic GroupⅠ GroupⅡ GroupⅢ Ultra-S 4,6,8 GroupⅣ
Saturates, % 65~85 93~99+ 95~99+ 99+ 99+
Aromatics, % 15~35 <1~7 <1~5 <1 <1
Sulfur, ppm 300~3000 5~300 0~30 <1 n/a
Viscosity @ 100℃, cSt 4~32 4~30 4~8 4.0~7.6 4~70
Viscosity Index(VI) 95~105 95~118 123~150 120~135 125~150
Pour point, ℃ -15 -15 -15 -22.5 ~ -15 -45

Base stocks are classified into various grades including Neutral, Solvent Neutral, Bright Stocks, The most common names are for group I (SN: Solvent Neutral), for group II (N: Neutrals) and group III grade names refer to the viscosity (4cst, 6cst, 8cst …).

Group I – Baseoil Grades – Technical Specifications

Characteristic Units SN-150 SN-500 Bright Stock Test Method
Kinematic viscosity at 100°C cSt 4.4 – 5.6 9.7 – 12.0 min. 28 ASTM D-445
Kinematic viscosity at 40°C cSt 28 – 32 90 – 105 ASTM D-445
Viscosity index (VI) 95 – 100 95 – 100 min. 95 ASTM D-2270
Flash Point °C min. 195 min. 210 min. 276 ASTM D-92
Sulphur Content %Wt 0.15 – 0.60 0.15 – 0.60 0.15 – 0.60 ASTM D-2622
Pour Point °C max. -6 max. -6 max. -9 ASTM D-97
Density @ 15°C Kg/L 0.870 – 0.890 0.885 – 0.895 0.900 – 0.910 ASTM D-1298
Color max. 2 max. 2 max. 2 ASTM D-1500
TAN mg KOH/g max. 0.05 max. 0.05 max. 0.05 ASTM D-664
Carbon Residue Content %Wt 0.04 0.12 0.21 ASTM D-189

Group II – Baseoil Grades – Technical Specifications

Characteristic Units N-150 N-500 Test Method
Kinematic viscosity at 100°C cSt 5.0-5.6 10.0-12.0 ASTM D-445
Kinematic viscosity at 40°C cSt 28-32 95-107 ASTM D-445
Viscosity index (VI) 95-110 95-110 ASTM D-2270
Flash Point °C min. 210 min. 230 ASTM D-92
Sulphur Content %Wt max. 0.012 max. 0.012 ASTM D-2622
Pour Point °C max. -12 max. -12 ASTM D-97

Group III – Baseoil Grades – Technical Specifications

Characteristic Units 4cSt 6cSt 8cSt Test Method
Kinematic viscosity at 100°C cSt 4.1 – 4.4 5.7 – 6.5 7.6 – 8.2 ASTM D-445
Kinematic viscosity at 40°C cSt 19.0 – 20.0 32.0 – 37.0 43.8 – 50.1 ASTM D-445
Viscosity index (VI) min. 120 min. 120 min. 120 ASTM D-2270
Flash Point °C min. 220 min. 220 min. 220 ASTM D-92
Sulphur Content %Wt 0.001 0.001 0.001 ASTM D-2622
Pour Point °C max. -12 max. -12 max. -12 ASTM D-97

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