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SN150 is a type of Group I base oil that stands for Solvent Neutral 150. It's a light mineral oil used primarily as a base stock in the formulation of lubricants. Here's a breakdown of what SN150 means:
SN150 is categorized under Group I base oils, which are:
SN500 is a Group I base oil with a higher viscosity than SN150. Like SN150, it stands for Solvent Neutral 500 and is derived from crude oil through solvent refining. It is commonly used as a base stock in lubricants, especially where a thicker, more viscous oil is needed.
BS150 in Base Oils refers to Bright Stock 150, a high-viscosity Group I base oil used primarily in heavy-duty lubricants. It's different from SN150 and SN500, which are much lighter. Bright stocks are produced from the residual fraction of vacuum distillation and are often used to boost the viscosity of oil formulations.
HC4 in base oils typically refers to a Group II+ or Group III base oil produced through hydrocracking—hence the "HC" prefix, which stands for HydroCracked. The “4” usually indicates its viscosity class, specifically a higher viscosity base oil, comparable to SN500 or slightly higher.
⚠️ Note: The term "HC4" isn't standardized across all producers—some refineries or suppliers may use "HC4" as a proprietary name or internal code. It’s most often used in technical datasheets or bulk oil procurement to describe high-quality hydrocracked base oil of medium-to-heavy viscosity.
HC7 is a high-viscosity, high-purity Group III base oil made using hydrocracking technology. Like HC4, the “HC” stands for HydroCracked, and the “7” typically indicates a higher viscosity grade than HC4 — close to or exceeding that of Bright Stock or Group III+ heavy neutrals.
HVI4 in base oils typically refers to a High Viscosity Index base oil of viscosity grade 4, produced through hydrocracking or isomerization processes. The term HVI stands for High Viscosity Index, and the “4” indicates a medium viscosity grade—generally comparable to SN500 or HC4.
These oils are often classified as Group II+ or Group III, depending on how they’re refined and the purity of the final product.
HVI8 is a High Viscosity Index (HVI) base oil with a higher viscosity class—used in high-performance lubricant formulations where greater thickness and thermal stability are needed. The “8” indicates a viscosity grade typically in the range of ~20–30 cSt at 100°C, similar to Bright Stock or HC7, but with higher purity and better performance characteristics.
It is usually a Group III or Group III+ base oil derived via hydrocracking and isomerization, and is water-white, low in sulfur, and high in saturates.
Transformer oil (also known as insulating oil) is a highly refined mineral oil or synthetic fluid used in transformers and other electrical equipment for the following purposes:
It is usually a Group III or Group III+ base oil derived via hydrocracking and isomerization, and is water-white, low in sulfur, and high in saturates.
