Product Description

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.

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

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

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