Mobil Gargoyle Arctic 68 NH
Refrigeration Oil for Ammonia (R-717) application
Mobil Gargoyle Arctic 68 NH is a high performance refrigeration oil designed specifically for the lubrication of refrigeration reciprocating and screw compressors using ammonia (NH3, R-717). It is formulated with high quality mineral paraffinic technology providing excellent low temperature performance, low volatility and thermal stability.
Its very low miscibility with ammonia limits oil thinning and minimizes oil carry-over. Low vapour pressure reduces oil consumption and need for top-ups while preventing fractionation (viscosity increase).
Viscosity control over a wide temperature range to obtain the lowest fluidity required in the evaporator and the highest viscosity for enhanced equipment protection in the compressor.
Datasheet
Features and Benefits
- Low volatility, helps reducing oil consumption (fewer oil top-ups), limiting oil thinning from fractionation
- Low Brookfield viscosity contributes to good oil flow at low temperatures and good oil return from evaporator
- Surface protection for increased equipment life, reduced repair costs
- High Viscosity Index for good compressor lubrication across wide operating temperatures
- Refrigerant compatibility contributes to oil separator efficiency (very low miscibility with NH3)
Applications
Application considerations: Mobil Gargoyle Arctic 68 NH is recommended for refrigeration systems for cylinder and bearing lubrication in conventional reciprocating and screw refrigeration compressors where ammonia refrigerant is used.
This includes:
- Large industrial reciprocating and screw refrigeration compressors used in the food industry for food preparation and freezing
- Industrial applications such as food freezing and cold storage plants
- Marine refrigeration applications
Typical Properties
Viscosity |
|
|
cSt @ 40º C |
ASTM D445 |
68.6 |
cSt @ 100º C |
ASTM D445 |
9.32 |
Viscosity Index |
ASTM D2270 |
113 |
Pour Point (ºC) |
ASTM D5950 |
-39 |
Flash Point (ºC) |
ASTM D92 |
248 |
Density @ 15ºC |
ASTM D4052 |
0.86 |
Brookfield Viscosity at -20°C (cP) |
ASTM D2983 |
6020 |
Health and Safety
Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx