S-OIL Lube Base Stock Characteristics
1. Low-sulfur, nitrogen and aromatics content, low toxicity, high viscosity index, excellent thermal stability, low volatility and good viscosity-temperature properties and additives susceptibility.
2. Hydrogenated base stocks are superior to common base stocks, with features that include: better oil-water separation, lower evaporation and low carbon residue. According to a CEC-L33-A-93 (EC standards for bio-degradability) trial, compared with solvent refined oil, hydrogenated base stocks possess a biodegradability ratio of 60%: 30%, which implies it is more environmentally friendly.
S-OIL’s aramcoULTRA and Aramco Prima Series Performance
·Very High Viscosity Index
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·Excellent Response to Pour Point Depressants (PPD)
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·Excellent Low Temperature Performance (CCS)
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·Excellent Oxidative and Thermal Stability
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·Very Low Volatility
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·Other Technical Merits
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| Viscosity Index S-Oil’s aramcoULTRA series possesses very high viscosity indices ranging from 120 to 130 while VIs of conventional Group Ⅰ and Group Ⅱ base oils range from 95 to 105.
The high viscosity indices of S-Oil’s aramcoULTRA series guarantees adequate engine lubrication under wide temperature ranges and economizes on VI improver treatments for multi-viscosity applications (which improve fuel efficiency).
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Pour Point Pour point is said to be one of the properties where other's Group Ⅲ products fall short of PAOs.
But as shown in the figure above, S-Oil’s aramcoULTRA series responds to pour point depressants so effectively that the actual difference in pour points of finished lubricant products is similar to PAO(~-40℃) .
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| Low Temperature Performance (CCS) Due to very high viscosity index, the CCS (cold cranking simulator) viscosity of S-Oil’s aramcoULTRA series exhibits a result comparable to that of PAOs of similar viscosity grades.
This feature makes S-Oil’s aramcoULTRA series a very effective & economical substitute for PAOs for fuel efficient multi-grade crankcase engine oils .
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Noack Volatility For fear of oil consumption and poisoning of catalytic converters, low volatility has become a very important factor required from the base oil side. Most recent engine oil specifications like ILSAC GF-4 and ACEA A3/B3/C1/2B, require very stringent volatility from the finished products.
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| Oxidative and Thermal Stability Due to the wax hydroisomerization process (turning wax molecules into highly stable isoparaffinic structures) and hydrofinishing process (almost completely eliminating unstable components and impurities), S-Oil’s aramcoULTRA series shows excellent oxidative and thermal stability comparable to that of PAOs, which guarantees extended life of finished products.
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S-Oil’s aramcoULTRA series base stocks exhibit results comparable to that of PAOs, which makes aramcoULTRA products an ideal platform for engine oils satisfying the newest specifications.
Other Technical Merits
Flash point：
S-Oil’s aramcoULTRA series base stocks possess higher flash points than conventional Group I or Group II oils due to narrower distillation range. This feature, by reducing the possible fume and fire hazards, contributes to making the workplace safer and cleaner for industrial applications .
Good Anti-Emulsification property ：
Rapid separation of oil and water with clear oil and water interface makes aramcoULTRA base stocks good raw material for turbine oils and hydraulic oils.
Saturate & Purity：
The all-hydroprocessing routes taken at S-Oil’s Onsan aramcoULTRA base oil plant ensure almost complete removal of aromatics and impurities in the final product while leaving most desired components like isoparaffins and 1-ring naphthenes.
Due to the isoparaffin and 1-ring components having the highest oxidation and thermal stability while preserving very high VIs, S-Oil’s aramcoULTRA series exhibits superior stability over conventional base stocks including earlier generation Group III oils.
Furthermore, only traceable amounts of aromatics in aramcoULTRA products ensure superior stability as white mineral oils.
Typical Properties
aramcoULTRA Series
S-Oil’s aramcoULTRA series consists of five viscosity grades aramcoULTRA2,3,4,6 and 8, named according to their viscosities (cst) at 100℃.
| Typical Properties of aramcoULTRA Series |
Test Items
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Ultra S2
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Ultra S3
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Ultra S4
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Ultra S6
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Ultra S8
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ASTM
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Appearance
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B & C
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B & C
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B & C
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B & C
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B & C
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Visual
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Sp.Gravity, 15/4 ℃
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0.82
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0.827
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0.834
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0.841
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0.847
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D1298
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Color, Saybolt
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30
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30
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30
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30
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30
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D156
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Kin.Vis@40 ℃ ,cst
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7.117
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13.47
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19.62
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28.72
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43.89
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D445
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Kin.Vis@100 ℃ ,cst
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2.174
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3.315
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4.247
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5.457
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7.234
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Viscosity Index
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109
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117
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123
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128
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127
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D2270
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Flash Point ℃ (COC)
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162
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204
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228
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232
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256
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D92
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Pour Point ℃
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-37.5
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-25
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-20
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-17.5
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-15
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D5950
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Sulfur Content wt ppm
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< 1.0
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< 1.0
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< 1.0
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< 1.0
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< 1.0
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D5453
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Carbon Residue (CCR),wt%
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< 0.01
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< 0.01
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< 0.01
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< 0.01
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< 0.01
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D4530
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Copper Corrosion, 100 ℃ /3hr
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1a
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1a
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1a
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1a
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1a
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D130
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TAN, mgKOH/g
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< 0.01
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< 0.01
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< 0.01
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< 0.01
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< 0.01
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D974
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Ring Analysis
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CA wt%
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0.1
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0.2
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0.2
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0.3
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0.2
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D3238
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CN wt%
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21.9
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17.3
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17.7
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17.2
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20.9
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CP wt%
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78
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82.5
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82.1
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82.5
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78.9
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Aniline Point ℃
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101.8
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111.3
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115.8
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119.8
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124
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D611
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US Absorbance, 260-350nm
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< 0.1
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< 0.1
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< 0.1
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< 0.1
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< 0.1
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D2269
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Noack, wt%
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-
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-
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14.5
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8.2
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4.1
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D5800
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Saturates, wt%
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> 99
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> 99
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> 99
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> 99
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> 99
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D2007
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| Typical Properties of Aramco Prima Series |
Test Items
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S-31(Aramco Prima-150)
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S-96(Aramco Prima-500)
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ASTM
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Sp.Gravity 15/4 ℃
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0.8634
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0.8762
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D1298
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Color, Saybolt
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+30
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+30
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D156
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Kin.Vis@40℃ ,cst
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29.97
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96.66
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D445
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Kin.Vis@100℃ ,cst
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5.174
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10.93
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Viscosity Index
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101
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97
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D2270
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Flash Piont, ℃ (COC)
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214
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242
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D92
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Pour Point ℃
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-15
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-15
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D5950
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Sulfur Content, wt ppm
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<10
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<10
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D5453
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Carbon Residue(CCR),wt%
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< 0.01
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< 0.01
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D4530
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Copper Corrosion,100 ℃/3hr
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1a
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1a
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D130
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TAN, mgKOH/g
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< 0.01
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< 0.01
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D974
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Ring Analysis
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CA wt%
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0.6
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0.1
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D3238
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CN wt%
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34
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32.6
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CP wt%
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65.4
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67.3
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Aniline Point, ℃
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110.8
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-
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D611
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Aramco Prima series base stocks are highly purified water-white color products which have low aromatic and high naphthenic content with high Viscosity Index. Aramco Prima series base stocks include: S-31（Aramco Prima 150N）and S-96（Aramco Prima 500N）. |
