DOW DOWTHERM synthetic organic heat transfer fluid — 208L steel drum, UAE stock

DOW 208L steel drum — DOWTHERM heat transfer fluid

DOW — Synthetic Organic Heat Transfer Fluids

DOWTHERM™ Heat Transfer Fluids

Q: Which DOWTHERM grade should I use?

It depends on your maximum bulk temperature and whether your system is pressurized. DOWTHERM A is the choice for the highest temperatures up to 400°C and is the only grade commonly run in vapour phase alongside DOWTHERM J. DOWTHERM RP, MX and T are designed for non-pressurized or low-pressure liquid phase systems. DOWTHERM J is the fluid of choice for single fluid heating and cooling in batch processing. DOWTHERM Q is positioned as an economical replacement for hot oils above 260°C.

Q: What is the difference between DOWTHERM A and DOWTHERM RP?

DOWTHERM A reaches a higher maximum temperature of 400°C and can operate in both liquid and vapour phase, but it freezes at 12°C, which means systems may need freeze protection. DOWTHERM RP tops out at 350°C bulk and 375°C film temperature and is liquid phase only, but it is designed for non-pressurized systems, is pumpable to 0°C, and degrades primarily to low molecular weight products so no heavy material accumulates in the system.

Q: Can DOWTHERM fluids be used in vapour phase?

DOWTHERM A operates in vapour phase from 257°C to 400°C and DOWTHERM J operates in vapour phase from 180°C to 315°C. The remaining grades — G, Q, RP, MX and T — are intended for liquid phase operation. All DOWTHERM fluids have vapour pressures lower than steam.

Q: Do you supply DOWTHERM heat transfer fluids in the UAE?

FluidLine Oils supplies DOWTHERM synthetic organic heat transfer fluids from Abu Dhabi, United Arab Emirates, with dispatch across the GCC including Saudi Arabia, Kuwait, Qatar, Bahrain and Oman. Contact us for current stock position, pack sizes and lead times.

Seven Grades — A, G, J, Q, RP, MX & T | UAE Stock

DOWTHERM™ synthetic organic heat transfer fluids have set the industry benchmark since 1929. Each grade offers exceptional thermal stability, translating into more efficient heat transfer, longer fluid life and better operating economics than conventional hot oils. All DOWTHERM fluids have vapour pressures lower than steam, which makes them more practical and less costly to run at elevated temperature.

Seven Grades Available

DOWTHERM A

15°C to 400°C liquid, 257°C to 400°C vapour. A eutectic mixture of biphenyl and diphenyl oxide — both have practically the same vapour pressure, so the blend handles as a single compound. The industry standard for over 90 years. Note the 12°C freeze point when siting outdoor plant.

DOWTHERM G

–6°C to 360°C. Contains a mixture of di- and tri-aryl compounds. Dow describes it as the most thermally stable low-pressure liquid-phase heat transfer fluid on the market, with excellent flow characteristics at low temperatures.

DOWTHERM J

–80°C to 315°C liquid, 180°C to 315°C vapour. A mixture of isomers of an alkylated aromatic engineered for demanding low-temperature duty in liquid-phase pressurized systems. Outstanding low-temperature pumpability and thermal stability against accidental overheating.

DOWTHERM Q

–35°C to 330°C. An economical alternative to hot oils, combining high-temperature stability with low-temperature pumpability. Well suited to waste heat recovery and LNG liquefaction.

DOWTHERM RP

350°C maximum bulk, 375°C maximum film. A diaryl alkyl for non-pressurized liquid-phase systems, pumpable to 0°C. Degrades primarily to low molecular weight products, so there is no build-up of heavy material to remove from the system.

DOWTHERM MX

–23°C to 330°C. A mixture of alkylated aromatics designed as a direct alternative to hot oils in liquid-phase heat transfer systems.

DOWTHERM T

288°C optimum maximum, extendable to 315°C bulk. A mixture of C₁₄–C₃₀ alkyl benzenes for liquid-phase non-pressurized systems, pumpable below –10°C. High flash point and extremely low single-dose oral toxicity.

All grades supplied from Abu Dhabi with fast dispatch across the UAE, Saudi Arabia, Kuwait, Qatar, Bahrain and Oman.

Grade

Pack Size

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DOWTHERM™ Grade Comparison — Typical Properties

Select on maximum bulk temperature first, then on whether your system is pressurized and how cold it gets at shutdown. Freezing point matters as much as top-end temperature — DOWTHERM A freezes at 12°C, which is a real consideration for outdoor plant.

Property	A	G	J	Q	RP	MX	T
Composition	Diphenyl oxide / biphenyl blend	Di- and tri-aryl compounds	Alkylated aromatic isomers	—	Diaryl alkyl	Alkylated aromatics	C₁₄–C₃₀ alkyl benzenes
Colour	Clear to light yellow	Light amber to brown	Clear, colourless	—	Clear, colourless	—	Clear, yellow
Use range, liquid (°C)	15 to 400	–6 to 360	–80 to 315	–35 to 330*	350 max bulk 375 max film	–23 to 330*	288 optimum 315 extended bulk
Use range, vapour (°C)	257 to 400	—	180 to 315	—	—	—	—
Use range, liquid (°F)	60 to 750	20 to 675	–110 to 600	–30 to 625*	660 max bulk	–10 to 625*	500 / 600 ext.
Boiling point (°C)	257.1	289 reflux	181	267*	353	328*	345 initial
Freeze / crystal point (°C)	12.0	Below 4	<–81	–35*	Pumpable to 0	–25*	Pumpable below –10
Flash point (°C)	113 (SETA)	137 (COC)	57 (closed cup)	120*	194 (PMCC)	165*	188 (COC)
Fire point (°C)	118 (COC)	—	60 (COC)	—	206 (COC)	—	210 (COC)
Autoignition (°C)	599	432	420	411*	385	420*	375
Density @ 25°C (kg/m³)	1056	1043	860	961.5*	1025.8	958.7*	869.8
Average molecular weight	166.0	204.6	134	—	236.4	—	318
Est. critical temperature (°C)	497	548	383	—	575	—	375
Est. critical pressure (bar)	31.34	27.56	28.4	—	20.7	—	10.3
Heat of combustion (kJ/kg)	36,053	—	41,400	—	40,194	—	42,808
System type	Pressurized, liquid or vapour	Low pressure liquid	Pressurized, liquid or vapour	Liquid	Non-pressurized / low pressure	Non-pressurized / low pressure	Non-pressurized
Availability (UAE)	Enquire for current stock position

Values taken from the individual Dow technical data sheets for DOWTHERM A (176-01463), G (176-01466), J (176-01465), RP (176-01473) and T (176-01472). Figures marked * are from Dow's DOWTHERM™ and SYLTHERM™ product line guide (176-01638-01-0820), as individual data sheets for DOWTHERM Q and MX are not currently published here. Properties shown are typical and are not to be construed as specifications. Refer to the current Dow technical data sheet and safety data sheet for design values.

Saturated Liquid Properties

Specific heat, density, thermal conductivity, viscosity and vapour pressure across the operating range of each grade — the values needed for heat exchanger sizing, pump selection and expansion tank calculations. Data for DOWTHERM Q and MX will be added when those data sheets are published here.

DOWTHERM A (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. bar
15	1.558	1063.5	0.1395	5.00	0.00
65	1.701	1023.7	0.1315	1.58	0.00
105	1.814	990.7	0.1251	0.91	0.01
155	1.954	947.8	0.1171	0.56	0.06
205	2.093	902.5	0.1091	0.38	0.28
255	2.231	854.0	0.1011	0.27	0.97
305	2.373	801.3	0.0931	0.20	2.60
355	2.527	742.3	0.0851	0.16	5.80
405	2.725	672.5	0.0771	0.12	11.32

DOWTHERM G (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. bar
–5	1.458	1066.2	0.1293	55.9	0.00
35	1.598	1035.3	0.1247	7.11	0.00
75	1.738	1004.3	0.1201	2.69	0.00
115	1.878	973.3	0.1154	1.45	0.00
155	2.018	942.3	0.1108	0.91	0.02
195	2.158	911.3	0.1061	0.62	0.10
235	2.297	880.3	0.1015	0.45	0.30
275	2.437	849.3	0.0969	0.34	0.76
315	2.577	818.3	0.0922	0.27	1.66
355	2.717	787.3	0.0876	0.21	3.24
375	2.787	771.8	0.0853	0.19	4.37

DOWTHERM J (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. bar
–80	1.584	931.3	0.1485	8.43	—
0	1.769	878.5	0.1326	1.23	—
80	2.023	817.4	0.1156	0.47	0.03
160	2.315	749.2	0.0987	0.28	0.58
240	2.636	668.8	0.0817	0.20	3.59
320	3.040	560.4	0.0647	0.16	12.79

DOWTHERM RP (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. bar
10	1.591	1036.2	0.1327	88.17	—
70	1.769	994.2	0.1249	5.39	—
130	1.948	951.7	0.1171	1.71	—
190	2.126	908.3	0.1093	0.87	0.01
250	2.305	863.8	0.1016	0.54	0.09
310	2.483	817.4	0.0938	0.38	0.41
370	2.662	768.1	0.0860	0.29	1.40

DOWTHERM T (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. kPa
–10	1.873	893.9	0.141	251.68	0.0
40	2.022	859.5	0.130	12.80	0.0
90	2.171	825.0	0.119	3.28	0.0
140	2.320	790.6	0.108	1.45	0.1
190	2.469	756.1	0.097	0.82	0.6
240	2.618	721.7	0.086	0.54	4.3
290	2.767	687.2	0.075	0.39	19.4
320	2.857	666.5	0.068	0.33	41.2

DOWTHERM A also has published saturated vapour properties (enthalpy, latent heat, vapour density, compressibility) as does DOWTHERM J — request the full data sheet for vapour phase system design.

Technical Data Sheets

Official Dow technical data sheets — full property tables, thermal stability data and system design guidance for each grade.

Why Specify DOWTHERM™

90+ Years of Proven Service

DOWTHERM A has set the industry standard since 1929, precisely because of its thermal stability in applications up to 400°C. Few fluids carry that depth of operating history.

Vapour Pressure Below Steam

Every DOWTHERM grade operates at vapour pressures lower than steam, cutting the cost and complexity of expansion tanks, pressure vessels and safety systems.

Outperforms Hot Oils

DOWTHERM Q, MX and T are engineered as direct replacements for mineral hot oils, delivering better thermal stability and longer fluid life at moderate temperatures.

Single-Fluid Heat & Cool

DOWTHERM J covers –80°C to 315°C in one fluid, removing changeovers and flushes in batch reactors and pharmaceutical processing.

Non-Pressurized Options

DOWTHERM RP, MX and T are designed for non-pressurized or low-pressure systems — lower capital cost and simpler certification for many installations.

Widest Grade Selection

Seven grades spanning –80°C to 400°C means the fluid can be matched precisely to duty rather than compromising system design around a limited range.

Recommended Grade by Application

Dow's own application recommendations. These assume typical operating conditions — confirm fluid selection with technical support before committing to a design.

Application	Recommended Fluid
Concentrated solar power	DOWTHERM A
Polysilicon refinement & wafer preparation	DOWTHERM J, SYLTHERM XLT, SYLTHERM HF
Biofuel production	DOWTHERM Q, DOWTHERM G
Ethylene oxide, DMT, linear alkyl benzene	DOWTHERM A, DOWTHERM RP
Phthalic anhydride, formaldehyde, BDO	DOWTHERM A
Environmental test chambers, chiral processes	DOWTHERM J, SYLTHERM XLT, SYLTHERM HF
Oleo chemistry	DOWTHERM Q
Caprolactam, polyamide (nylon)	DOWTHERM A, DOWTHERM RP
Polyester, PET	DOWTHERM A, DOWTHERM RP
Polycarbonate	DOWTHERM G, DOWTHERM RP
Polystyrene	DOWTHERM Q
Textile spinning machines	DOWTHERM A, DOWTHERM J
Textile dyeing	DOWTHERM T
Plastics moulding	DOWTHERM A, DOWTHERM J
Reboilers / feed heaters in refineries	All grades
Offshore platforms	DOWTHERM T, DOWTHERM Q
Natural gas processing	DOWTHERM T, DOWTHERM Q
LNG liquefaction	DOWTHERM A, RP, Q, T
Asphalt processing	DOWTHERM Q, DOWTHERM T
Coal gasification	DOWTHERM G
Vegetable oil deodorisers	DOWTHERM A, DOWTHERM T, SYLTHERM 800/XLT/HF
Multi-purpose pharmaceutical plants	DOWTHERM J, SYLTHERM XLT/HF/800

Frequently Asked Questions

Which DOWTHERM grade should I use?

It depends on your maximum bulk temperature and whether your system is pressurized. DOWTHERM A is the choice for the highest temperatures up to 400°C and is the only grade commonly run in vapour phase alongside DOWTHERM J. DOWTHERM RP, MX and T are designed for non-pressurized or low-pressure liquid phase systems. DOWTHERM J is the fluid of choice for single fluid heating and cooling in batch processing. DOWTHERM Q is positioned as an economical replacement for hot oils above 260°C.

What is the difference between DOWTHERM A and DOWTHERM RP?

DOWTHERM A reaches a higher maximum temperature of 400°C and can operate in both liquid and vapour phase, but it freezes at 12°C, which means systems may need freeze protection. DOWTHERM RP tops out at 350°C bulk and 375°C film temperature and is liquid phase only, but it is designed for non-pressurized systems, is pumpable to 0°C, and degrades primarily to low molecular weight products so no heavy material accumulates in the system.

Can DOWTHERM fluids be used in vapour phase?

DOWTHERM A operates in vapour phase from 257°C to 400°C and DOWTHERM J operates in vapour phase from 180°C to 315°C. The remaining grades — G, Q, RP, MX and T — are intended for liquid phase operation. All DOWTHERM fluids have vapour pressures lower than steam.

Do you supply DOWTHERM heat transfer fluids in the UAE?

FluidLine Oils supplies DOWTHERM synthetic organic heat transfer fluids from Abu Dhabi, United Arab Emirates, with dispatch across the GCC including Saudi Arabia, Kuwait, Qatar, Bahrain and Oman. Contact us for current stock position, pack sizes and lead times.