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World leading Refrigeration Oils

a Sonneborn licensed and registered trademark.

Suniso, the original

The design of modern air-conditioning and refrigeration compressors varies from manufacturer to manufacturer. However, all have one important characteristic: they require a highly specialized type of lubricating oil in order to assure a long trouble-free service of the refrigerant compressor.

Suniso oils meet these special demands; they are of high stability and give long trouble-free service life in modern compressors designed to maximize output capacity with minimum physical size.
Suniso mineral oils are manufactured from well-refined petroleum lubricating oil stocks, while the synthetic ones are based on the finest synthetic base stocks. All represent the best choice among available compressor lubricants.
Refrigeration compressor oils must lubricate moving parts effectively while satisfying requirements not demanded from other general purpose lubricating oils. Unlike such oils, refrigeration oils are expected to give trouble-free service. Lubrication, of course, is considered the primary function of a compressor oil. In addition, it must have certain other properties because:

  • It mixes intimately with the refrigerant used in the system.
  • It is carried over in small amounts into the refrigeration lines.
  • It is in direct contact with the motor windings in hermetic units.
  • It is exposed to temperature extremes: high temperatures at the compressor discharge valve, and very low temperatures at the expansion valve.
Suniso refrigeration oils have the following characteristics which assure maximum trouble-free service life:

  • CHEMICAL STABILITY : To resist interaction with the refrigerant or metal parts in the system.
  • THERMAL STABILITY : To eliminate excessive carbon deposits at compressor hotspots such as valves or discharge ports.
  • LOW WAX CONTENT : To prevent separation of flocculent wax from the oil-refrigeration mixture at the low temperature points in the system.
  • LOW POUR POINT : To prevent separated oil from congealing in refrigerant lines.
  • HIGH DIELECTRIC STRENGTH : To ensure good insulating properties. In hermetic units, the oil-refrigerant mixture serves as an insulator between the motor and the compressor body.
  • PROPER VISCOSITY : To ensure high film strength at elevated operating temperatures and good fluidity under the coldest operating temperatures even when diluted with refrigerant.
  • NO CONTAMINATION : To prevent scarring of bearing surfaces, plugging of lines or oil ports and general deterioration.
Suniso GS was introduced by Sun Oil Company back in 1968. The new Suniso reference was an important upgrade to the industry’s requirement making Suniso GS superior to all other existing references on the market. Suniso GS had become the new Grade Standard, in short GS.

The Suniso brand was created in 1933 and produced in the famous refinery of Marcus Hook in Philadelphia, USA. In 1984, the Suniso brand was bought by Witco (Crompton). Sun Oil Company Belgium NV acquired the exclusive manufacturing & distribution rights in that same year.

Today the brand ownership is in the hands of Sonneborn Inc. In 2008, the family business of Sun Oil in Belgium was purchased by Petronas Lubricants International (wholly owned subsidiary of Petronas) that transformed the company into Petronas Lubricants Belgium NV. Under the management of PLI, the activities were anchored in the renewed Hemiksem plant in Belgium while embracing the strong Petronas focus on safety and quality.

2 Ranges, 9 Products

Suniso GS Range

Recommended by most major equipment manufacturers and refined from specially selected naphthenic base crude oils. Highly stable, essentially wax free, thus providing excellent low temperature properties and assuring long trouble-free life. Suniso GS oils can be used in virtually any installation, regardless of compressor or evaporation temperature and are miscible with (H)CFC refrigerants and natural refrigerants. Therefor Suniso GS oils can be applied in commercial as well as in residential refrigeration and air conditioning systems.

Suniso SL Range

Suniso SL synthetic refrigeration oils are formulated with select polyol ester based stocks and additives, providing outstanding lubrication, stability and corrosion protection. Suniso SL oils are miscible with HFC refrigerants at extremely low temperatures. Suitable for use in compressors of refrigeration and air conditioning systems, working on ozone friendly alternative coolants.

Technical Support

Since 2007, our company has been delivering advanced refrigeration oils to customers around the world. We strive for total customer satisfaction by delivering high-performing products backed by excellent service and support.

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because user satisfaction is what matters