Description
❄️ Suniso SL 68 Technical Details
| Property | Value (Typical Analysis) | Unit | ASTM Method (Common) |
| Type | Polyol Ester (POE) | N/A | N/A |
| ISO Viscosity Grade (VG) | 68 | N/A | ISO 3448 |
| Kinematic Viscosity @ 40°C | 65.0 – 70.1 | cSt (mm^2/s) | D445 |
| Kinematic Viscosity @ 100°C | 8.3 – 9.1 | cSt (mm^2/s) | D445 |
| Viscosity Index (VI) | 105 – 109 | N/A | D2270 |
| Density @ 15°C | 0.960 – 0.973 | kg/L | D4052 |
| Pour Point | -36 / -33 to -40 / -40 | ^C / ^F | D5950 / D97 |
| Flash Point | 252 / 486 to 255 / 491 | ^C / ^F | D92 |
| Water Content (Moisture) | < 100 | ppm | D6304 |
| Acid Value | < 0.1 | mg KOH/g | D974 (Modified) |
🌟 Key Features of Suniso SL 68 (POE)
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POE Synthetic Base: It is a fully synthetic Polyol Ester (POE) lubricant. This is required for chemical stability and miscibility when used with modern, chlorine-free HFC and HFO blend refrigerants.
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Most Common Viscosity (ISO VG 68): This medium viscosity grade is often considered the industry standard for HFC systems. It offers an excellent balance of strong anti-wear protection and superior flow characteristics for efficient oil circulation.
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HFC and HFO Compatibility: Fully compatible with all major HFC refrigerants (e.g., R-134a, R-404A, R-407C, R-410A) and suitable for many next-generation HFO/HFC blends.
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Exceptional Oil Return (Miscibility): The oil exhibits superior miscibility with HFCs. This is the single most important operational feature, ensuring the oil is carried effectively out of the evaporator and reliably returned to the compressor to prevent oil starvation.
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Excellent Thermal Stability: Maintains a high Flash Point (252^C). This feature ensures the oil resists thermal breakdown at the high-temperature discharge side of the compressor, minimizing the formation of damaging sludge and carbon deposits.
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Superior Low-Temperature Fluidity: It boasts a very low Pour Point (as low as -36^C). This guarantees the oil remains highly fluid in low-temperature applications, preventing congealing, waxing, and system blockage.
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Wide Compressor Suitability: Due to its balanced properties, it is specified for a wide range of compressors, including scroll, reciprocating, screw, and centrifugal designs, especially in commercial HVAC and refrigeration.
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