9/16/2023 0 Comments Mineral oil viscosity index![]() ![]() ![]() Synthetic base oils are classified according to their chemical structure, such as PAOs (polyalpha olefin), PAGs (poly alkaline glycol), or esters (diester, polyol ester, phosphate ester, etc.). They are typically more expensive than mineral, but they can improve machine performance in many applications. Synthetic base oils are man-made and can be tailored to have specific properties, such as a high viscosity index or superior thermal stability. Mineral base oils are classified according to their refining process and viscosity, such as paraffinic, naphthenic, or aromatic. They are relatively inexpensive and widely available but also have some limitations, such as a relatively low viscosity index and poor thermal stability. Mineral base oils are derived from crude oil and are the most commonly used type. Beyond these categories, there are well-defined and accepted technical categories that lubricant manufacturers use to select base oils. The three general categories of base oils are mineral, synthetic, and bio-based. Consequently, selection requires careful thinking and planning around the machine’s operating conditions to produce a finished product that serves the long-term performance interests of the machine owner. The American Petroleum Institute classifies them into five base oil groups.īase oils define the inherent properties of the finished product, including viscosity, stability/longevity, and load-bearing capacity (the ability to withstand extreme pressures).įor example, a lubricant made with a high-quality, highly refined base oil may have better thermal and oxidative stability than a lubricant made with a lower-quality base oil but NOT have the same degree of load-bearing capacity as a result of the molecular structure and purity.Īs a result, the choice of base oil is an essential consideration in producing lubricants. They are typically derived from crude oil but can also be made from synthetic or bio-based sources. Base oils are the starting material for producing lubricants, and their properties greatly influence the performance and characteristics of the finished lubricant. ![]()
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