TranslateHeat Transfer Fluids
High-temperature PAG heat transfer fluids with low evaporation loss, excellent thermal stability, and wide operating range up to 260°C.
Performance Advantages
Why PAG for Heat Transfer Fluids
Exceptional thermal stability
PAGs resist thermal degradation and oxidation at sustained high temperatures (up to 260°C), maintaining fluid integrity and extending service life compared to mineral oil-based heat transfer fluids.
Low evaporation loss
PAGs have low vapour pressure at operating temperatures, reducing fluid top-up requirements, minimising workplace exposure, and lowering total cost of ownership.
Wide operating temperature range
PAGs operate effectively from −40°C to 260°C, eliminating the need for seasonal fluid changes and simplifying system design for applications with variable duty cycles.
Pumpability at low temperatures
High viscosity index means PAGs remain pumpable at startup temperatures where mineral oil-based fluids would require preheating, reducing system warm-up time and energy consumption.
Application Segments
Sub-Segments
Industrial Process Heating
Chemical processing, pharmaceutical manufacturing, food processing; ISO VG 46–100 for sustained high-temperature service.
Product Range
Recommended PAG Grades
Typical grades for heat transfer fluids: PAG 46, PAG 68, PAG 100
Product catalog is being updated. Browse all products to find the right grade.
Browse ProductsPerformance Comparison
PAG vs Mineral Oil vs Synthetic Aromatic
How PAG base oils compare to mineral oil and Synthetic Aromatic across key performance properties.
| Property | PAG | Mineral Oil | Synthetic Aromatic |
|---|---|---|---|
| Oxidation Stability | Excellent | Moderate | Excellent |
| Viscosity Index | > 200 | 95–110 | 100–120 |
| Pour Point | ≤ −40°C | −15 to −10°C | −30°C |
| Thermal Stability | Up to 260°C | Up to 150°C | Up to 340°C |
| Biodegradability | Readily biodegradable | Poor | Poor |
| Seal Compatibility | FKM, HNBR, PTFE | Most seals | FKM, PTFE |
Formulation Guidance
Compatible Additives
DODPA (Octylated Diphenylamine)
0.5–1.5% for high-temperature continuous operation; critical for preventing oxidative degradation
BHT (Butylated Hydroxytoluene)
0.5% as a secondary antioxidant for system startup/shutdown cycling
Technical Reference
Technical Notes
Operating temperature range: −40°C to 260°C bulk fluid temperature (up to 300°C film temperature for short periods). System design should include nitrogen blanketing for open expansion tanks to minimise oxidative degradation. PAG heat transfer fluids should be monitored for viscosity changes and acid number to determine fluid change intervals. Compatible with standard heat transfer system materials (carbon steel, stainless steel). Relevant standards: DIN 51522 (Heat transfer fluids), ISO 6743-12 (Heat transfer fluid classification), ASTM D5372 (Heat transfer fluid testing).
Free Tools
Free Tools for This Application
Use our free online tools to find the right PAG grade, check compatibility, and calculate specifications for your application, no signup required.
PAG Technical Guide
Comprehensive PAG selection and properties reference, covering chemistry, viscosity, compatibility, and sourcing.
Launch ToolViscosity Calculator
Calculate PAG viscosity at different operating temperatures using ASTM D341 regression.
Launch ToolAll tools are free, no signup, no email required. Visit meecarigno.co.uk/resources to see all tools.
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