DOW SYLTHERM silicone heat transfer fluid — 208L steel drum, UAE stock

DOW 208L steel drum — SYLTHERM heat transfer fluid

DOW — Silicone Heat Transfer Fluids

SYLTHERM™ Heat Transfer Fluids

Q: What is the difference between SYLTHERM 800, XLT and HF?

SYLTHERM 800 is the high-temperature grade, with a recommended operating range of -40°C to 400°C. SYLTHERM XLT is the ultra-low-temperature grade, running from -100°C to 260°C, and is widely used for cryogenic cooling and single-fluid heating and cooling systems. SYLTHERM HF covers -73°C to 260°C and has a closed-cup flash point of 63°C, which Dow notes provides an extra margin of safety and can reduce system and engineering costs.

Q: How long does SYLTHERM 800 last in service?

SYLTHERM 800 can often remain in service for 10 years or more, even when operated at the upper end of its recommended range, without the periodic reclaiming or reprocessing associated with many organic heat transfer fluids.

Q: Do you stock SYLTHERM heat transfer fluids in the UAE?

FluidLine Oils supplies SYLTHERM silicone 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.

Q: Can SYLTHERM be used for both heating and cooling in one system?

Yes. SYLTHERM XLT in particular is well suited to single-fluid process heating and cooling, removing the need to flush and change fluids between hot and cold duty cycles in batch processing and reactor applications.

Silicone Thermal Fluids — SYLTHERM 800, XLT & HF | UAE Stock

SYLTHERM™ silicone heat transfer fluids are specially formulated, high-performance polymers designed for liquid-phase thermal systems. Their low viscosity delivers excellent heat transfer performance and pumpability, while the siloxane backbone resists the thermal degradation that shortens the life of conventional hot oils. SYLTHERM fluids can often remain in service for 10 years or more without periodic reclaiming, and are low in odour and acute oral toxicity.

Three Grades Available

SYLTHERM 800

–40°C to 400°C. The high-temperature grade and the widest range of any SYLTHERM fluid. For high-temperature process heating, jacketed vessels and thermal oil heater circuits.

SYLTHERM XLT

–100°C to 260°C. The ultra-low-temperature grade, with outstanding low-temperature heat transfer and pumpability. Designed for single-fluid process heating and cooling systems in the pharmaceutical and fine chemical industries.

SYLTHERM HF

–73°C to 260°C. A closed-cup flash point of 63°C gives an extra margin of safety and can reduce system and engineering costs. For single-fluid systems and sub-zero duty including environmental chambers and freezer loops.

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

Grade

Pack Size

Enquire Now Download TDS

SYLTHERM™ Grade Comparison — 800 vs XLT vs HF

All three grades are silicone-based liquid-phase heat transfer fluids. The practical difference between them is operating temperature range and flash point — compare the first four rows below to select the right grade for your system.

Property	SYLTHERM 800 High Temperature	SYLTHERM XLT Ultra-Low Temperature	SYLTHERM HF Low Temp, Higher Flash
Composition	Dimethyl Polysiloxane
Colour	Clear (darkens yellow after extended use)	Crystal-clear liquid	Crystal-clear liquid
Recommended Use Range	–40°C to 400°C	–100°C to 260°C	–73°C to 260°C
Recommended Use Range (°F)	–40°F to 750°F	–150°F to 500°F	–100°F to 500°F
Phase	Liquid phase
Viscosity @ 25°C (77°F)	9.1 mPa·s	1.4 mPa·s	1.70 mPa·s
Flash Point, Closed Cup	160°C (320°F)	47°C (116°F)	63°C (145°F)
Flash Point, Open Cup	177°C (350°F)	54°C (130°F)	76.7°C (170°F)
Fire Point	193°C (380°F)	—	—
Autoignition Point (ASTM D-2155)	385°C (725°F)	350°C (662°F)	355°C (671°F)
Freeze Point	–60°C (–76°F)	–111°C (–168°F)	<–82°C (<–115°F)
Density @ 25°C (77°F)	936 kg/m³ (7.8 lb/gal)	852 kg/m³ (7.1 lb/gal)	864 kg/m³ (7.2 lb/gal)
Specific Gravity @ 25°C	0.93	0.85	0.87
Acid Number, Typical	0.03	0.01	—
Heat of Combustion	28,659 kJ/kg (12,300 Btu/lb)	32,800 kJ/kg (14,100 Btu/lb)	31,851 kJ/kg (13,670 Btu/lb)
Average Molecular Weight	—	317	439
Estimated Critical Temperature	367°C (692°F)	327°C (620°F)	350°C (662°F)
Estimated Critical Pressure	10.9 bar (10.8 atm)	12.16 bar (12 atm)	10.6 bar (10.5 atm)
Estimated Critical Volume	3.22 l/kg (0.0515 ft³/lb)	3.9 l/kg (0.063 ft³/lb)	3.62 l/kg (0.058 ft³/lb)
Odour	Essentially none; low in acute oral toxicity
Typical Service Life	Often 10 years or more	—	—
Best Suited To	High-temperature liquid-phase process heating	Single-fluid heating & cooling, pharmaceutical and fine chemical	Single-fluid systems, environmental chambers, freezer loops
Availability (UAE)	Enquire for current stock position

Data taken from Dow product information sheets for SYLTHERM 800, SYLTHERM XLT and SYLTHERM HF. Typical properties 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.

SYLTHERM 800 (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. kPa
–40	1.506	990.61	0.1463	51.05	0.00
0	1.574	953.16	0.1388	15.33	0.00
40	1.643	917.07	0.1312	7.00	0.10
80	1.711	881.68	0.1237	3.86	1.46
120	1.779	846.35	0.1162	2.36	9.30
160	1.847	810.45	0.1087	1.54	35.00
200	1.916	773.33	0.1012	1.05	94.60
240	1.984	734.35	0.0936	0.74	204.80
280	2.052	692.87	0.0861	0.54	380.20
320	2.121	648.24	0.0786	0.41	630.50
360	2.189	599.83	0.0711	0.31	961.20
400	2.257	547.00	0.0635	0.25	1373.00

SYLTHERM XLT (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. kPa
–100	1.520	978.5	0.1341	78.6	—
–20	1.688	896.4	0.1192	3.1	—
60	1.826	814.2	0.1019	0.80	1.8
140	2.024	732.0	0.0827	0.36	40.1
220	2.192	649.8	0.0620	0.22	261.9
280	2.318	588.2	0.0455	0.17	701.8

SYLTHERM HF (SI Units)

Temp. °C	Specific Heat kJ/kg·K	Density kg/m³	Therm. Cond. W/m·K	Viscosity mPa·s	Vapour Press. bar
–73	1.453	965.78	0.1301	16.46	0.00
–70	1.460	962.75	0.1293	14.87	0.00
–20	1.583	912.20	0.1169	3.88	0.00
30	1.707	861.65	0.1045	1.58	0.00
80	1.830	811.10	0.0921	0.83	0.01
130	1.953	760.55	0.0797	0.51	0.11
180	2.076	710.00	0.0673	0.35	0.49
230	2.199	659.45	0.0549	0.26	1.55
260	2.273	629.12	0.0475	0.22	2.74

Technical Data Sheets

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

Why Specify SYLTHERM™

Widest Temperature Envelope

From –100°C on SYLTHERM XLT to +400°C on SYLTHERM 800 — one fluid family covering cryogenic cooling through to high-temperature process heating.

10+ Year Service Life

Silicone fluids do not degrade the way conventional hot oils do. SYLTHERM can remain in service for a decade or more, even at the top of its range, without reclaiming.

Low Fouling, No Periodic Venting

Low-molecular-weight siloxanes formed under thermal stress remain part of the fluid rather than fouling the system — reducing maintenance downtime and cleanout cost.

Single-Fluid Heating & Cooling

SYLTHERM XLT allows one fluid to serve both hot and cold duty in batch reactors — eliminating steam-brine or steam-glycol changeovers and system flushes.

Low Viscosity, High Efficiency

Excellent pumpability at low temperature reduces pumping energy and start-up problems, while low viscosity supports strong heat transfer coefficients.

Low Odour & Low Oral Toxicity

SYLTHERM fluids are essentially odourless and low in acute oral toxicity — an operational advantage in enclosed plant and occupied process areas.

Typical Applications

Oil & gas processing

Chemical processing

Pharmaceutical reactors

Solar energy manufacturing

Jacketed vessels

Batch process heating

Cryogenic cooling

Lyophilisation / freeze drying

Polymer processing

Heat exchanger circuits

Thermal oil heater systems

Food & beverage processing

Frequently Asked Questions

What is the difference between SYLTHERM 800, XLT and HF?

SYLTHERM 800 is the high-temperature grade, with a recommended operating range of –40°C to 400°C. SYLTHERM XLT is the ultra-low-temperature grade, running from –100°C to 260°C, and is widely used for cryogenic cooling and single-fluid heating and cooling systems. SYLTHERM HF covers –73°C to 260°C and has a closed-cup flash point of 63°C, which Dow notes provides an extra margin of safety and can reduce system and engineering costs.

How long does SYLTHERM 800 last in service?

SYLTHERM 800 can often remain in service for 10 years or more, even when operated at the upper end of its recommended range, without the periodic reclaiming or reprocessing associated with many organic heat transfer fluids.

Do you stock SYLTHERM heat transfer fluids in the UAE?

FluidLine Oils supplies SYLTHERM silicone 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.

Can SYLTHERM be used for both heating and cooling in one system?

Yes. SYLTHERM XLT in particular is well suited to single-fluid process heating and cooling, removing the need to flush and change fluids between hot and cold duty cycles in batch processing and reactor applications.