What is
Base Oil

• Definition

  Base oil is the main raw material of all lubricant products.
  Like basic petroleum oil products such as gasoline, kerosene and diesel, Since it is derived from crude oil, it is called "mineral base oil".
  In the other hand, base oils obtained through chemical synthesis are called “chemical synthetic base oil”.
  Lubricants has complex composition and varying viscosity. Above other ingredients, the quality of base oil is very important as they occupy high proportion in lubricants.

• API Classification

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  API Classification

  Viscosity grade	Saturated hydrocarbon	Sulfur	Viscosity index
  Group Ⅰ	< 90%And / Or	< 0.03%And	80 ≤ Ⅵ 120
  Group Ⅱ	≥ 90%And	≥ 0.03%And	80 ≤ Ⅵ 120
  Group Ⅲ	≥ 90%And	≥ 0.03%And	Ⅵ ≥ 120
  Group Ⅳ	PAO(Poly Alpha Olefin)
  Group Ⅴ	Ester & Others

• Classification By Viscosity

  • NEUTRAL NUMBER

    "Neutal" comes from the characteristic of base oil that the acid atmospheric residue is changed into neutral oil after treating.
    It is mainly indicated by adding N to the SUS viscosity value at 100 °F(37.8 °C).

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  NEUTRAL NUMBER

  Neutral
  Number	40℃		100℃
  	cSt	SUS	cSt	SUS
  70N	13.3	70.8	3.0	37.0
  100N	21.5	104.0	4.0	39.0
  150N	31.6	148.0	4.9	42.4
  250N	56.1	257.0	6.5	47.0
  500N	107.0	496.0	11.0	64.0
  600N	130.4	604.0	12.1	66.0

• • BRIGHT STOCK

    "Bright stock" comes from the characteristicthat very turbid and black oil is turned into bright oil.
    Generally, solvent is used to distill the residue under reduced pressure. Manufactured by De-waxing and Hydro-treating.
    Since it very high-viscosity base oil, it is mainly mixed with low-viscosity base oil for adjusting viscosity of lubricants.

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  BRIGHT STOCK

  Bright Stock
  Number	40℃		100℃
  	cSt	SUS	cSt	SUS
  135BS	413.2	1875.0	28.6	135.0
  150BS	568.0	2632.0	33.0	155.0
  175BS	654.7	3034.0	36.0	169.7

• Classification By Composition

  Basically, the composition of mineral oil is mostly influenced by the crude oil used for the first time.
  However, it is not simply purified by fractionation or extraction recently.
  Since base oils are often manufactured by reactions such as conversion, the composition of the final base oil product is very different from that of the original crude oil because it is less influenced by crude oil.

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  Classification By Composition

  Classification	Paraffin, %	Naphthen, %	Aromatics, %
  Paraffin Base Oil	45~60	20~30	15~25
  Naphthenic Base Oil	15~25	65~75	~10
  Aromatic Base Oil	~5	60~75	20~25