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Klüber Syntheso D 680
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Klüber Syntheso D 680
Synthetic high-temperature lubricating oils
Application Klüber Syntheso D 680
SYNTHESO D oils are used for the lubrication of friction points subject to high temperatures. They are also used as pressure fluids in high-temperature applications, and as heat carrier fluids. Owing to the base oil’s high pressure absorption capacity and good wear protection, SYNTHESO D oils are particularly suitable for hydraulic or heat transfer applications where lubricity has to be ensured at high temperatures.
Performance, Features & Benefits of Klüber Syntheso D 680 are:
- Good resistance to ageing and oxidation
- Excellent viscosity-temperature relation
If you have any questions, please contact OilOnline Technical Helpdesk
Product Description Klüber Syntheso D 680
SYNTHESO D oils are synthetic high-temperature oils on a polyglycol basis. They are very resistant to ageing and oxidation and have a very good viscosity-temperature relation.
Typical Characteristics
| Product specifications | Method |
Klüber Syntheso D 680 |
|
| Article number | 012067 | ||
| Lower service temperature | -25 °C / -13 °F | ||
| Upper service temperature | 180 °C / 356 °F | ||
| Density | 20 °C | DIN 51757 | approx. 1.06 g/cm³ |
| Flash point, Cleveland, open-cup apparatus | >= 220 °C | DIN EN ISO 2592 | |
| Kinematic viscosity | 40 °C | DIN 51562 pt. 01/ASTM D-445/ASTM D 7042 | approx. 680 mm²/s |
| Kinematic viscosity | 150 °C | DIN 51562 pt. 01/ASTM D-445/ASTM D 7042 | approx. 43 mm²/s |
| Kinematic viscosity | 100 °C | DIN 51562 pt. 01/ASTM D-445/ASTM D 7042 | approx. 110 mm²/s |
| ISO viscosity grade | DIN ISO 3448 | 680 | |
| Viscosity index | DIN ISO 2909 | >= 250 | |
| Pour point | <= -25 °C | DIN ISO 3016 |
|
| Thermal expansion coefficient (cubic) | between 20 °C and 80 °C | approx. 0.0008 1/K | |
| Thermal conductivity | 20 °C |
approx. 0.175 W / (K * m) |
|
| Minimum shelf life from the date of manufacture - in a dry, frost-free place and in the unopened original container, approx. |
36 months |
Application notes
SYNTHESO D oils are suitable for immersion and circulation lubrication systems. If they are used as heat carrier fluids it is important not to exceed a specific load of approx. 1.5 W/cm2 in case of free convection and approx. 2 W/cm2 in case of forced convection. For the maximum surface temperature of the heat exchanger (film load limit) please refer to the product data. SYNTHESO D oils are not miscible with mineral oils and synthetic hydrocarbons. We recommend cleaning the lubrication points prior to conversion, and rinsing gears or closed lubrication systems with the SYNTHESO D oil that will be used for lubrication. SYNTHESO D oils are neutral towards ferrous materials and almost all nonferrous metals. There may be increased wear when the contact surfaces of design elements made of aluminium or aluminium alloys are exposed to dynamic loads (sliding speed and high loads). If necessary, wear tests should be carried out. Depending on the temperature and exposure time, synthetic lubricants on a polyglycol base may have an impact on the functional capacity of rubber-elastic sealing materials. Seals made of NBR can be used at permanent temperatures up to 80 °C. At higher temperatures seals made of FKM or VQM should be used. It has to be taken into account that different elastomer qualities produced by one manufacturer or different manufacturers may show a different behaviour. Paints may be attacked by synthetic lubricants. When applying SYNTHESO D oils we recommend the use of two-component paints (reactive paints). Oil gauge glasses should preferably be made of natural glass or polyamide materials. We recommend testing the suitability of design materials in contact with the selected lubricants, especially for series application.
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