SN is the abbreviation of Neutral Solvent or BS equals Bright Stock.
SN & BS tests are mentioned below:
| Property | Explanation | How It Is Determined | ASTM No. |
|---|---|---|---|
| Viscosity | Defines base oil viscosity grade | Gravity flow capillary viscometer | D445 |
| Viscosity Index | Defines viscosity-temperature relationship |
Viscosity variance between 40 degrees C and 100 degrees C, indexed |
D2270 |
| Specific Gravity | Defines density of oil relative to water |
Hydrometer | D1298 |
| Flash Point | Defines high-temp volatility and flammability properties |
Flash point tester, temp. at which flash surface flame is achieved |
D92/D93 |
| Pour Point | Defines low-temp oil fluidity behavior |
Gravity flow in test jar, temp at which approximately 22,000 cSt is reached |
D97/IP15 |
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