Description
ExxonMobil’s Esterex™ Esters are API category Group V fluids. Esterex™ Polyol Esters are produced by the reaction of a polyol with mono-carboxylic acids. The Esterex™ Polyol Esters have excellent lower-temperature properties, good lubricating properties and lower volatilities than mineral oils with comparable viscosity. In addition, Esterex™ Polyol Esters are the most hydrolytically and thermally stable class of esters in the Esterex™ line.
Applications
Esterex™ Polyol Esters can be used as either sole basestocks or as blendstocks with other synthetic fluids in many automotive and industrial lubricant applications. These esters are ideal for use in highly loaded, high-speed lubricant applications where energy efficiency is desired. When used in automotive lubricants, Esterex™ Polyol Esters also provide excellent additive solubility and seal-swelling properties. Typical lubricants that incorporate Esterex™ Polyol Esters can include:
- Compressor oils
- Automotive engine oils
- High-temperature greases
- Turbine oils
- Two-stroke engine oils
- Hydraulic fluids
Basics
| Esterex™ |
NP343 |
NP451 |
NP671 |
| Specific Gravity @15.6/15.6°C | 0.945 | 0.993 | 0.982 |
| Water, ppm | < 350 | < 500 | < 500 |
| Total Acid Number (TAN), mg KOH/g | 0.02 | 0.01 | 0.02 |
| Refractive Index @ 25°Ca | 1.4521 | 1.4506 | 1.4563 |
Appearance
| Esterex™ |
NP343 |
NP451 |
NP671 |
| Appearance | Bright & Clear | Bright & Clear | --- |
| Color, ASTM | 0.5 | < 0.5 | < 2.5 |
| Color, Saybolta | +17 | +17 | --- |
Flow
| Esterex™ |
NP343 |
NP451 |
NP671 |
| Kinematic Viscosity @ 100°C, mm²/s or cSt | 4.3 | 5.0 | 7.6 |
| Kinematic Viscosity @ 40°C, mm²/s or cSt | 19 | 25 | 49 |
| Kinematic Viscosity @ -40°C, mm²/s or cSta | 2,540 | 7,610 | 90,740 |
| Viscosity Index | 136 | 130 | 121 |
| Pour Point, °C | -48 | -60 | -48 |
| Surface Tension @ 24°C, mN/m or dynes/cma | 30.9 | 28.5 | 35.0 |
Thermal
| Esterex™ |
NP451 |
NP671 |
NP343 |
| Autoignition Temperature, °Ca |
378 |
387 |
--- |
| Flash Point, Open Cup, °C |
257 |
255 |
256 |
| Flash Point, Closed Cup, °Ca |
245 |
245 |
230 |
| Fire Point, °Ca |
291 |
287 |
--- |
| Noack Volatility, wt.%a |
4.6 |
4.6 |
3.3 |
| Evaporation Loss @ 205°C for 6.5 hrs, wt.%a |
5.0 |
6.0 |
--- |
| Density Correction Factor, (g/cc)/°Ca |
7.02 × 10⁻⁴ |
7.60 × 10⁻⁴ |
7.49 × 10⁻⁴ |
| Thermal Conductivity @ 37.8°C, cal/sec(cm)²(°C/cm) or [BTU/hr(ft)²(°F/ft)]a |
3.86×10⁻⁴ [0.0934] |
3.82×10⁻⁴ [0.0924] |
--- |
| High Temperature Thermal Stability @ 204°C for 100 hrsa |
NP451 |
NP671 |
NP343 |
| Increase in viscosity, % |
1.6 |
3.6 |
--- |
| Change in TAN, mg KOH/g |
+ 0.11 |
+ 0.23 |
--- |
| Appearance after exposure |
No precipitate |
No precipitate |
--- |
Solubility
| Esterex™ |
NP343 |
NP451 |
NP671 |
| Aniline Point, °Ca |
< 20.0 |
< 20.0 |
< 23.2 |
| Kauri-Butanol Value, (KB)a |
62.5 |
72.0 |
24.6 |
Performance
| Property |
NP343 |
NP451 |
NP671 |
| 4-Ball Wear, mm scar diametera |
0.60 |
0.66 |
0.667 |
| Demulsibility @ 54.4°C, mina |
10 |
10 |
< 30 |
| Foam Seq. 1, mL/mLa |
0/0 |
0/0 |
20/0 |
| Hydrolytic stability, TAN change mg KOH/ga |
+ 0.20 |
+ 0.17 |
--- |
| HPDSC, OIT iso @ 220°C with AOb, mina |
56 |
61 |
--- |
| RPVOT (Neat), mina |
120 |
1455 |
72 |
| RPVOT with AOb, mina |
--- |
--- |
934 |
| Oxidation and Corrosion with AOb @175°C for 72 hrsa |
--- |
--- |
--- |
| TAN increase, mg KOH/g |
--- |
--- |
--- |
| Increase in viscosity, % |
--- |
--- |
--- |
| Lead corrosion wt. change, mg/in²a |
- 1.1 |
- 1.0 |
--- |
| Copper corrosion @121°C for 3 hrsa |
1b |
1b |
--- |
| Biodegradation in 28 days, OECD 301F, %a |
76.4d |
83.6 |
100 |
Elastomer Compatibilityc Nitrilea
| Property |
NP343 |
NP451 |
NP671 |
| Volume change, % |
--- |
+ 25.0 |
--- |
| Hardness change |
- 9 |
- 11 |
--- |
| Tensile strength change, % |
- 46.0 |
- 47.8 |
--- |
| Elongation change, % |
- 34.0 |
- 36.4 |
--- |
Flouroelastomera
| Property |
NP343 |
NP451 |
NP671 |
| Volume change, % |
+ 4.7 |
+ 12.7 |
--- |
| Hardness change |
- 2 |
- 8 |
--- |
| Tensile strength change, % |
- 3.7 |
- 15.9 |
--- |
| Elongation change, % |
- 5.6 |
- 22.9 |
--- |
Polyacrylatea
| Property |
NP343 |
NP451 |
NP671 |
| Volume change, % |
+ 27.4 |
+ 51.2 |
--- |
| Hardness change |
- 10 |
- 15 |
--- |
| Tensile strength change, % |
- 27.2 |
- 39.2 |
--- |
| Elongation change, % |
- 29.6 |
- 36.2 |
--- |
a Single sample or two-sample average determinations
b 1 wt.% diphenyl amines and phenyl naphthylamine antioxidant (AO) added
c Estimated values for Esterex™ NP372
d OECD 301B
Safety and Handling
For information on toxicology and safe handling of these products, refer to the Material Safety Data Sheets available on request or visit our Web site at http://www.exxonmobilsynthetics.com.
Shipping Information
DOT Hazard Class: Not Regulated.
DOT Hazard Labeling: None Required.
Availability
ExxonMobil Esterex™ products are available in drums and in bulk. Samples are available upon request. Please call 800.682.8342 in the United States; 32.2.722.36.50 in Brussels; 86.21.2407.5157 ext. 5157 in Shanghai; 65.6885.8419 in Singapore; or 81.3.6713.4040 in Tokyo. Or visit our Web site at http://www.exxonmobilsynthetics.com.
