Base Oil

الوصف

Lubricants are generally composed of a majority of base oil plus a variety of additives to impart desirable characteristics. Although generally lubricants are based on one type of base oil, mixtures of the base oils also are used to meet performance requirements.

Mineral oil term is used to encompass lubricating base oil derived from crude oil.Its classified in different types of lubricant base oil:-

Group I Saturates <*0% and/or sulfur >0.*3%, and Society of Automotive Engineers (SAE) viscosity index (VI) of *0 to **0 Manufactured by solvent extraction, solvent or catalytic dewaxing, and hydro-finishing processes. Common Group I base oil are **0SN (solvent neutral), **0SN, and **0BS (brightstock).

Group II Saturates over *0% and sulfur under 0.*3%, and SAE viscosity index of *0 to **0 Manufactured by hydrocracking and solvent or catalytic dewaxing processes. Group II base oil has superior anti-oxidation properties since virtually all hydrocarbon molecules are saturated. It has water-white color.

Group III Saturates > *0%, sulfur <0.*3%, and SAE viscosity index over **0 Manufactured by special processes such as isohydromerization. Can be manufactured from base oil or slax wax from dewaxing process.

Group IV Polyalphaolefins (PAO)

Group V All others not included above such as naphthenics, PAG, esters.