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.

 

Equipment lubricant recommendations

Our Mobil™ Product Selector tool will help you identify lubricant(s) for your specific equipment.

Data sheets

Technical resources

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