Base Oil
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Category: Uncategorised
Almost every lubricant used in plants today started off as just a base oil. Typically lubricants contain 90% base oil and less than 10% additives. So it’s very useful in different industries specially in lubricant industry. Base oil is typically defined as oil with a boiling point range between 550 and 1050 F, consisting of hydrocarbons with 18 to 40 carbon atoms. This oil can be either paraffinic or naphthenic in nature depending on the chemical structure of the molecules.
Base stocks are classified inot 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 …).
GT provides and supplies different grade of base oil from Group I. Group 1 base oils are the least refined of all the groups. They are usually a mix of different hydrocarbon chains with little or no uniformity. While some automotive oils on the market use Group I stocks, they are generally used in less demanding applications.
Group I base stocks contain less than 90 percent saturates and/or greater than .03 percent sulfur and have viscosity index greater than or equal to 80 and less than 120.
| PROPERTY |
TEST METHOD |
SN 150 |
SN 500 |
| Kinematics Viscosity@40°C (cSt) |
ASTM D-445 |
38 |
TBR |
| Kinematics Viscosity@100°C (cSt) |
ASTM D-445 |
5.5 |
11-12 |
| Viscosity Index |
ASTM D-2270 |
100 |
88 (min) |
| Density @ 15°C |
ASTM D-4052 |
0.872 |
0.885-0.896 |
| Flash Point (°C) |
ASTM D-92 |
198 |
235 (min) |
| Pour Point (°C) |
ASTM D-97 |
-9 |
-3 to -6 |
| TAN (Mg KOH/gr) |
ASTM D-664 |
<0.05 |
0.05 |
| Carbon Residue (% wt) |
ASTM D-189 |
0.04 |
0.05 |
| Colour |
ASTM D-1500 |
0.5 |
2.5 (max) |