Paratherm HR Heat Transfer Fluid

CPI Fluid Engineering



Paratherm HR is an alkylated aromatic heat transfer fluid engineered for high performance in closed-loop liquid phase heating systems up to 650°F (343°C) in fired heaters and 675°F (357°C) in solid fuel-fired heat recovery and full convection heaters. It offers best-in-class thermal stability and efficiency with a wide operating range. With excellent pumpability, Paratherm HR’s unique formulation resists thermal decomposition and fouling at high temperatures.

Paratherm HR HTF offers superior thermal stability vs. competitive aromatic fluids rated to the same temperatures. Thermal stability testing per ASTM D6743 shows that Paratherm HR experiences nearly half the degradation as its closest competitor when held at 700°F for 500 hours. Additionally, Paratherm HR offers low viscosity which means better low temperature pumpability and efficiency vs. other synthetic aromatics in its class. These properties are advantageously combined to provide many years of consistent, reliable performance.

Application Industries

Alternative Energy & Emerging Technologies
Biofuel Processing
Chemical Processing
Oil & Gas Processing

Operating Range for Paratherm HR


Minimum Startup Temperature (300cSt)

Maximum Operating Temperature

11°F / -12°C

675°F / 357°C

Resources & Documents


Engineering Bulletin


View the technical data information for Paratherm HR Heat Transfer Fluid

View the Material Safety Data Sheet for Paratherm HR Heat Transfer Fluid

Extending Fluid Lifetime
When Paratherm fluids are used as recommended they can provide many years of reliable service. Systems using Paratherm fluids should be designed and installed by qualified engineers and should be maintained as any other critical production asset. Fluid oxidation is the leading cause of the most serious maintenance issues associated with closed-loop heat transfer systems– including cold spots, heater coking, plugged pressure sensors and ultimately fluid gelling. Paratherm recommends installation of a nitrogen blanket on the expansion tank to prevent oxidation of the fluid. All systems may benefit from side-stream filtration to promote long-term fluid and system reliability.
Fluid Analysis Services
Paratherm offers a comprehensive fluid monitoring service to help keep systems running at their best. Their state-of-the-art laboratory is certified to ISO 9001:2015 and well-equipped to run all critical tests. Annual testing is recommended and can identify system issues before they become catastrophic. The fluid in new systems should be tested within 9 to 12 months of start-up. New fluid in existing systems should be tested within the first month of operation to establish a base line for future testing, and annually thereafter.
Replacing Fluid
Replacement should be preceded by analysis of the fluid to determine if cleaning or flushing of the system is recommended prior to introducing new heat transfer fluid. Newly commissioned systems typically do not require cleaning before filling. Paratherm recommends installation of a Y-strainer with a minimum 60-mesh screen up-stream of the pump to catch any residues from manufacturing and construction of system components.
Fluid Storage
Barrels and pails should be stored indoors to prevent environmental contamination. If sealed barrels must be left outdoors, provisions should be made to prevent water from pooling on their tops. While unopened pails are considered weatherproof, Paratherm recommends they not be stacked when stored outdoors. If the fluid is below its minimum pumpable temperature, the containers may be moved indoors to warm up before charging into the system. Refer to the product safety data sheet (SDS) for additional handling and storage recommendations.

Speak to us

If you have a big system requirement, Paratherm can fill high-volume systems with Paratherm HR from bulk tanker. Get in touch with the Oil-Store team to request a bulk quotation.

Additional information

Weight N/A
Pack Size

5 US Gallon (18.9L), 55 US Gallon (208.2L)