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COMSTAR

COMSTAR is a brand of specialty chemicals and lubricants for refrigeration and gas systems, with a product line that includes polyol ester (POE) synthetic refrigeration oils, leak detection fluids, and related treatment chemicals. The brand is known in the HVACR and industrial refrigeration aftermarket for supplying lubricants compatible with current and transitional refrigerants, including HFCs such as R-32 and A2L-class mildly flammable refrigerants. COMSTAR products are used by compressor manufacturers, service contractors, and plant maintenance teams to maintain lubrication in systems where mineral oils are not suitable due to refrigerant miscibility or material compatibility requirements.

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About COMSTAR

COMSTAR is a brand of specialty chemicals and lubricants for refrigeration and gas systems, with a product line that includes polyol ester (POE) synthetic refrigeration oils, leak detection fluids, and related treatment chemicals. The brand is known in the HVACR and industrial refrigeration aftermarket for supplying lubricants compatible with current and transitional refrigerants, including HFCs such as R-32 and A2L-class mildly flammable refrigerants. COMSTAR products are used by compressor manufacturers, service contractors, and plant maintenance teams to maintain lubrication in systems where mineral oils are not suitable due to refrigerant miscibility or material compatibility requirements.

3G Electric supplies COMSTAR refrigeration oils and leak detection fluids to industrial and commercial buyers worldwide. The COMSTAR line available through 3G Electric includes polyol ester synthetic oils in ISO-32 and ISO-68 viscosity grades, with corresponding SUS viscosities of 150 and 300. These oils are formulated for use with HFC refrigerant groups, including R-32, and are A2L compatible. Pour points range from -52°F for the ISO-32 grades to -39°C for the ISO-68 grades, supporting low-temperature operation. Packaging options include 1-quart, 1-gallon, 5-gallon, and 55-gallon containers, allowing procurement in quantities suitable for service work or bulk system charging. The leak detection fluid is supplied for locating gas leaks in pressurized piping, valves, and fittings by forming bubbles at leak points.

Technical buyers selecting COMSTAR products should verify refrigerant compatibility, viscosity grade, and pour point against the compressor manufacturer's requirements. The polyol ester chemistry is intended for systems using HFC and A2L refrigerants where residual mineral oil or alkylbenzene may not be compatible. The ISO-32 grade with 150 SUS viscosity is typically specified for smaller compressors or lower-viscosity applications, while the ISO-68 grade with 300 SUS viscosity suits larger compressors or higher operating temperatures. The yellow color of the ISO-32 oils aids in identifying the fluid during service. 3G Electric provides access to these products with documentation including manufacturer part numbers, viscosity grades, and container sizes to support specification and procurement. For international orders, 3G Electric coordinates shipping and provides quotes based on current availability. The COMSTAR range is part of 3G Electric's broader catalog of industrial refrigeration and gas control components, allowing buyers to source lubricants, leak detection supplies, and related equipment from a single supplier.

Common Applications

  • Commercial refrigeration — COMSTAR ISO-32 polyol ester oil (e.g., part 45-007) for compressors using R-32 refrigerant in supermarket display cases and walk-in coolers.
  • Industrial refrigeration — COMSTAR ISO-68 polyol ester oil (e.g., part 45-010) for lubricating compressors in large cold storage and process cooling systems with HFC refrigerants.
  • HVAC service — COMSTAR ISO-32 oil in 1-quart containers (e.g., part 45-019) for field maintenance and oil changes in residential and light commercial air conditioning units.
  • Gas leak detection — COMSTAR leak detection fluid (part 90-210) for checking pressurized piping, valves, and fittings in industrial gas systems and refrigeration circuits.
  • Bulk system charging — COMSTAR ISO-32 oil in 55-gallon drums (e.g., part 45-009) for initial fill or large-volume oil replacement in industrial refrigeration plants.
  • A2L refrigerant systems — COMSTAR ISO-32 polyol ester oil (e.g., part 45-008) for compressors in equipment designed for mildly flammable A2L refrigerants, including R-32.

Frequently asked questions

Common questions about COMSTAR from 3G Electric.

What viscosity grades are available in COMSTAR polyol ester synthetic refrigeration oils?

COMSTAR polyol ester synthetic refrigeration oils are available in ISO-32 and ISO-68 viscosity grades. The ISO-32 grade has a viscosity of 150 SUS and a pour point of -52°F. The ISO-68 grade has a viscosity of 300 SUS and a pour point of -39°C. Both grades are supplied in multiple container sizes, including 1 quart, 1 gallon, 5 gallons, and 55 gallons, depending on the specific part number. These oils are formulated for compatibility with HFC refrigerant groups, including R-32, and are A2L compatible for mildly flammable refrigerants.

Is COMSTAR polyol ester oil compatible with R-32 refrigerant?

Yes, COMSTAR polyol ester synthetic refrigeration oils in the ISO-32 grade are specifically noted as compatible with R-32 refrigerant. They are also A2L compatible, meaning they can be used in systems with mildly flammable refrigerants classified as A2L. The ISO-68 grades are listed as compatible with HFC refrigerant groups. Always confirm compatibility with the compressor manufacturer's guidelines and the specific refrigerant in use, as system requirements can vary.

What is the pour point of COMSTAR ISO-32 and ISO-68 refrigeration oils?

COMSTAR ISO-32 polyol ester synthetic refrigeration oils have a pour point of -52°F. The ISO-68 grade oils have a pour point of -39°C. These pour points indicate the low-temperature flow characteristics of the oils, which is relevant for systems operating at low evaporator temperatures. The ISO-32 grade is often selected for lower-viscosity applications, while the ISO-68 grade provides higher viscosity for larger compressors or higher operating temperatures.

What container sizes are available for COMSTAR refrigeration oils?

COMSTAR polyol ester synthetic refrigeration oils are supplied in 1-quart, 1-gallon, 5-gallon, and 55-gallon containers. For example, part number 45-019 is a 1-quart container of ISO-32 oil, 45-007 is a 1-gallon container, 45-008 is a 5-gallon container, and 45-009 is a 55-gallon container. The ISO-68 grades follow similar packaging options, such as 45-020 (1 quart), 45-010 (1 gallon), and 45-011 (5 gallons). Container choice depends on the volume required for service or bulk charging.

How is COMSTAR leak detection fluid used?

COMSTAR leak detection fluid is applied to pressurized gas systems, including piping, valves, and fittings, to locate leaks. When applied, the fluid forms bubbles at leak points, allowing maintenance personnel to identify the source of a gas leak quickly. It is supplied under manufacturer part number 90-210. This method is commonly used for checking joints and connections in refrigeration, HVAC, and industrial gas systems. The fluid is intended for use on external surfaces and should be applied according to the manufacturer's instructions.

Can COMSTAR ISO-68 oil be used in low-temperature refrigeration systems?

COMSTAR ISO-68 polyol ester synthetic refrigeration oil has a pour point of -39°C, which supports operation in low-temperature systems. However, the appropriate viscosity grade depends on the compressor manufacturer's specifications and the system's operating conditions. ISO-68 oil is typically used in larger compressors or where higher viscosity is required. For very low evaporator temperatures, the ISO-32 grade with a pour point of -52°F may be more suitable. Always consult the compressor or system manufacturer's guidelines before selecting a lubricant.