DOWTHERM™

Synthetic Organic Fluids

DOWTHERM A heat transfer fluid is a eutectic mixture of two very stable compounds, biphenyl (C12H10) and diphenyl oxide (C12H10O). The fluid is dyed clear to light yellow to aid in leak detection.

DOWTHERM A fluid may be used in systems employing either liquid phase or vapor phase heating. Suitable applications include indirect heat transfer. Visit our concentrated solar power site to learn more about DOWTHERM A in solar applications.

DOWTHERM G heat transfer fluid contains a mixture of di- and tri-aryl ethers that offer remarkable performance in liquid phase heat transfer systems. It is one of the most thermally stable low pressure liquid phase heat transfer fluid on the market and has excellent flow characteristics at low temperatures.

DOWTHERM J heat transfer fluid is a mixture of isomers of an alkylated aromatic specially engineered for demanding low-temperature applications in liquid phase pressurized systems. DOWTHERM J fluid offers remarkable low-temperature pumpability and thermal stability for protection against accidental overheating. Suitable applications include single fluid heating and cooling.

DOWTHERM MX heat transfer fluid is a mixture of alkylated aromatics designed for use as an alternative to hot oils in liquid phase heat transfer systems. DOWTHERM MX fluid is suitable for use in non-pressurized systems; its good low temperature properties allow for low temperature start-up and pumpability. Expansion Tank Design: Even though DOWTHERM MX fluid can be operated in a non-pressurized system, it is recommended that the tank have an inert atmosphere. Nitrogen padding should be used on the expansion tank to exclude oxygen from the heat transfer system. The presence of oxygen will cause accelerated fluid degradation, which will considerably shorten the life of the fluid.

DOWTHERM Q heat transfer fluid contains a mixture of diphenylethane and alkylated aromatics. Compared to hot oils, it exhibits better thermal stability, particularly at the upper end of hot oils' use range, and significantly better low-temperature pumpability. Suitable applications include use as an alternative to hot oils in liquid phase heat transfer applications.

DOWTHERM RP heat transfer fluid is a diaryl alkyl intended for use in applications that require liquid phase heat transfer. Unlike other low pressure fluids — including partially hydrogenated terphenyls and dibenzyl toluene fluids — DOWTHERM RP fluid degrades primarily to low molecular weight products. This reduces the need to remove high molecular weight material from the system, resulting in longer fluid life, reduced fluid makeup requirements, less system downtime, and lower fluid and maintenance expense over the life of the heat transfer system. Suitable applications include non-pressurized or low pressure liquid phase systems including polyester, nylon, and other synthetic fiber processing facilities.

DOWTHERM T heat transfer fluid is a mixture of C14-C30 alkyl benzenes intended for use in applications that require liquid phase heat transfer. Suitable applications: Non-pressurized liquid phase systems with a maximum temperature of 550°F (288°C).

Product Geographic Availability Applications Product Description
DOWTHERM A PDF North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Oil & Gas
Plastic Processing
Chemical Processing
Solar Energy
Liquid Phase: 15°C to 400°C (60°F to 750°F)
Vapor Phase: 257°C to 400°C (495°F to 750°F)
DOWTHERM G PDF North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Oil & Gas
Plastic Processing
Chemical Processing
Heat Recovery
29°C to 371°C
(-20°F to 700°F)
DOWTHERM J North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Pharmaceutical
Chemical Processing
Liquid Phase: -80°C to 315°C (-100°F to 600°F)
Vapor Phase: 181°C to 315°C (358°F to 600°F)
DOWTHERM MX North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Chemical Processing 330°C (625°F)
DOWTHERM Q PDF North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Oil & Gas
Chemical Processing
Heat Recovery
-35°C to 330°C
(-30°F to 625°F)
DOWTHERM RP North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Oil & Gas
Heat Recovery
Plastics & Chemical Processing
Maximum bulk temperature of 350°C (660°F) and a maximum film temperature of 375°C (710°F)
DOWTHERM T PDF North America
Latin America
Europe, Middle East & Africa
Asia-Pacific, India
Oil & Gas
Chemical Processing
288°C (550°F) Bulk temperature of 315°C (600°F)

Trademark of Dow Corning Corporation.
1 Dow is a distributor of SYLTHERM products manufactured by Dow Corning Corporation.