Product range

Ultra-low pour point and viscosity synthetic heat transfer fluid with excellent low- and high-temperature fluidity, ideal for ultra-low temperature liquid phase and rapid heating/cooling cycles.

• Pumpable down to -115°C
• Matches Therminol VLT
• Fast cycling, precise control

Cross-reference: Therminol VLT

Wide-range fluid with a pour point below -110°C and service up to 315°C — the go-to choice for integrated hot/cold systems.

• -100 to 315°C span
• Matches Therminol D-12
• Best for hot/cold integration

Cross-reference: Therminol LT · Dowtherm J

Ultra-low temperature fluid with pour point below -100°C, suited to -85°C reactions alternating with mid-range heating.

• -85°C cold start
• Low viscosity, efficient heat transfer

Cross-reference: Therminol D-12

Mid/low temperature fluid with very low viscosity for -60 to 230°C precision temperature control.

• Cost-effective mid/low range
• Low viscosity, fast response

Cross-reference: Therminol D-12

Combined coolant/heat transfer fluid for -40 to 250°C alternating duty.

• Alternating hot/cold duty
• Higher flash point, safer operation

Cross-reference: Therminol ADX-10

Low viscosity fluid covering -30 to 300°C with good cold flow and 300°C stability.

• -30 to 300°C all-rounder
• Low viscosity, low pumping cost

Cross-reference: Therminol 59 · Marlotherm LH

Very low pour point and viscosity with high flash point and low volatility — designed for integrated hot/cold duty at low pressure.

• High flash, low volatility
• Integrated hot/cold cycling

Cross-reference: Therminol 59

Pour point down to -65°C for -60 to 300°C precision control at low system pressure.

• -65°C pour point with 300°C ceiling
• Built for wide-range chiller/heaters

Cross-reference: Syltherm 800 · Therminol 59

Flagship wide-range fluid: one fluid from -55 to 330°C, combining very low viscosity with high thermal stability.

• -55 to 330°C in one fluid
• Lowest changeover cost

Cross-reference: Therminol LH · Marlotherm LH

Alkylbenzene liquid phase fluid — the upgrade path from mineral oils, with a higher boiling range, better thermal/oxidative stability and longer life.

• Mineral oil replacement
• Cost-effective general purpose
• Fits fired & electric heaters

Cross-reference: Therminol 55 · Dowtherm T · Marlotherm LH

Excellent high temperature stability, long life and recyclability — designed for 320–350°C liquid phase systems at low pressure.

• 320–350°C liquid phase
• Long life, recyclable
• Type-tested to GB 23971

Cross-reference: Therminol 75 · Dowtherm MX · Marlotherm SH · Diphyl DT

Biphenyl/diphenyl oxide eutectic vapour-liquid two-phase fluid, 12 to 400°C — the classic vapour-phase formulation with high heat transfer coefficients.

• Two-phase, up to 400°C
• Matches Therminol VP-1 / Dowtherm A
• Excellent temperature uniformity

Cross-reference: Therminol VP-1 · Dowtherm A · Diphyl

Low-boiling aromatic two-phase fluid for -20 to 300°C, dedicated to spinning boxes and texturing machine heat boxes.

• Low-boiling two-phase
• Spinning box & texturing specialist

Cross-reference: Dowtherm J

Colourless, odourless low-viscosity silicone fluid with a pour point below -90°C, for -80 to 280°C chiller-heater units, jacketed reactors and open liquid-phase loops; excellent electrical insulation and physiological inertness.

• Silicone, odourless & non-corrosive
• Matches Syltherm family

Cross-reference: Syltherm XLT · Xiameter PMX-200

Colourless, odourless silicone fluid, pour point below -80°C and flash point above 200°C, for -60 to 300°C chiller-heater units, jacketed glass reactors and open liquid-phase loops.

• Suitable for open baths
• High flash, low volatility

Cross-reference: Syltherm 800 · Xiameter PMX-200

Medium viscosity silicone, -70°C pour point and 318°C flash point, oxidation resistant, for -30 to 300°C open heating systems, reactor jackets and temperature-cycling duty.

• Open system friendly
• Chemically inert, low odour

Cross-reference: Syltherm 800 · Dow Corning 550 · Xiameter PMX-200

High viscosity silicone, -65°C pour point and >326°C open-cup flash point, for -20 to 300°C open baths, thermostatic baths and safety-critical heating.

• >326°C open-cup flash point
• First choice for open baths

Cross-reference: Dow Corning 550 · Xiameter PMX-200

Single-component high-purity diisopropyl biphenyl with the stability needed for 350°C duty, resisting particulate and coke formation, low pressure and recyclable.

• 350°C liquid phase
• Coke and particulate resistant
• Made in Germany by RÜTGERS

Cross-reference: Therminol 62 · Dowtherm MX · Marlotherm SH · Diphyl DT

Single-component diisopropyl naphthalene — a cost-efficient synthetic fluid covering low to high temperature duty up to 330°C.

• Best value synthetic
• Low viscosity, low energy cost

Cross-reference: Therminol 59 · Dowtherm Q · Marlotherm LH

Colourless, odourless high-temperature synthetic fluid built on high-purity single aromatic hydrocarbons: very low pour point and viscosity, excellent thermal stability, very high atmospheric boiling point and low system pressure at high temperature.

• 350°C liquid phase, 380°C film temperature
• Boiling point >390°C, low system pressure
• Autoignition >450°C

Cross-reference: Therminol SH

High-purity (>99%) fluorinated fluid with no flash point, non-flammable, chemically and biologically inert, high dielectric strength — for semiconductor test & packaging, server immersion cooling and EV battery testing.

• No flash point, non-flammable
• Dielectric strength >25kV
• Fluid down to -85°C

Cross-reference: 3M Fluorinert FC-72 · Novec 7100

High-purity (>99%) fluorinated fluid with a slightly higher boiling point than HFP-03; no flash point, non-flammable, inert and highly insulating for chip testing, server immersion cooling and battery testing.

• No flash point, non-flammable
• Specific heat 1.22 kJ/kg·K
• Built for immersion cooling

Cross-reference: 3M Fluorinert FC-77 · Novec 7100 · Novec 7200

Low-viscosity synthetic single-phase immersion cooling fluid: thin film, uniform heat dissipation, ultra-low conductivity (<0.1 ps/m), high insulation plus lubrication — for EV three-electric systems, high-power direct-cooled chargers and data-centre servers.

• Conductivity <0.1 ps/m, high insulation
• 0.15 W/m·K, specific heat 2.0 J/g·K
• Readily biodegradable

Cross-reference: Shell Immersion Cooling Fluid S3

Mid-viscosity member of the ICF range with an open-cup flash point above 190°C for extra safety margin; uniform film, strong lubricity and oxidation stability for high-load immersion battery packs, server cooling and component testing.

• Open-cup flash point >190°C
• Conductivity <0.1 ps/m
• Strong lubricity and oxidation life

Cross-reference: Shell Immersion Cooling Fluid S5

Ultra-low temperature synthetic fluid with a pour point below -100°C: low cold viscosity, efficient heat transfer, covering -100 to 220°C for rapid heat/cool cycling in low-pressure systems.

• Pour point below -100°C
• Pumpable at -80°C
• Low odour and toxicity

Cross-reference: Syltherm XLT

Single aromatic synthetic fluid bridging low and medium-high temperature duty (-30 to 320°C) with low pour point, low viscosity and long service life; recyclable.

• -30 to 320°C in one fluid
• Autoignition ≥430°C
• Low viscosity, low pumping cost

Cross-reference: Therminol L-60

Very wide range synthetic refrigerant/heat transfer fluid from -50 to 330°C: pour point below -60°C, autoignition above 460°C — one fluid for alternating hot and cold duty.

• -50 to 330°C span
• Pour point below -60°C
• Autoignition above 460°C

Cross-reference: Therminol LH

Fluorinated fluid spanning -85 to 300°C: no flash point, non-flammable, inert to acids, bases, halogens and oxidisers, low volatility and excellent dielectric behaviour.

• Non-flammable from -85 to 300°C
• Resists aggressive chemicals
• Decomposition above 290°C

Cross-reference: Galden HT

Fluorinated fluid for -75 to 300°C with a higher boiling point (>230°C) and lower evaporation loss; no flash point, non-flammable and chemically inert.

• Boiling point >230°C, low loss
• Non-flammable, no flash point
• Oxidation resistant

Cross-reference: Galden HT

Colourless water-based secondary refrigerant / heat transfer fluid: no flash point, non-flammable, non-corrosive to copper and carbon steel, high specific heat and conductivity, biodegradable; -35 to 110°C.

• Non-flammable, no flash point
• Specific heat ≈2.6 kJ/kg·K, 0.49 W/m·K
• Non-corrosive and biodegradable

Cross-reference: Dowtherm SR-1 · Dynalene HC

Potassium formate based secondary refrigerant: pour point below -60°C, non-flammable, high specific heat and thermal conductivity, biodegradable and toxicologically safe; -60 to 115°C.

• Cold chain duty to -60°C
• Non-flammable and biodegradable
• ≈0.50 W/m·K conductivity

Cross-reference: Dynalene HC · Dowtherm SR-1

Inhibited ethylene glycol antifreeze / secondary coolant with a -40°C pour point for -40 to 110°C refrigeration and heating loops, HVAC, underfloor heating and solar water systems.

• Inhibited for system protection
• Frost protection to -40°C
• HVAC, underfloor & solar ready

Cross-reference: Dowfrost · Dowtherm SR-1

Single-component hydrogenated terphenyl synthetic fluid with high thermal stability and excellent heat transfer up to 350°C, enabling low-pressure liquid-phase operation with long service life and recyclability.

• Liquid phase to 350°C at low pressure
• Autoignition 380°C, max film 380°C
• For polymer fibre & silicone monomer plants

Cross-reference: Therminol 66 · Therminol 68 · Dowtherm RP · Diphyl THT

Synthetic aromatic fluid for -30 to 300°C with good cold flow and low vapour pressure for pressurised liquid-phase loops.

• -30 to 300°C pressurised liquid phase
• Low viscosity, efficient heat transfer

Cross-reference: Therminol VP-3

Low-boiling synthetic fluid from -2 to 330°C for pressurised liquid-phase high-temperature duty; benchmarked against Therminol VP-3.

• Pressurised liquid phase to 330°C
• Therminol VP-3 equivalent

Cross-reference: Therminol VP-3

Water-based inhibited glycol fluid for -30 to 130°C refrigeration, heating and process temperature control loops.

• Non-flammable
• Inhibited for system protection

Cross-reference: Dowtherm SR-1

Propylene glycol based fluid for -45 to 130°C, low toxicity and suitable for food and pharmaceutical indirect contact duty.

• Low-toxicity propylene glycol
• Food and pharma duty

Cross-reference: Dowfrost · Dowtherm SR-1

Water-based fluid spanning -50 to 160°C with improved thermal stability for alternating hot/cold process loops.

• -50 to 160°C water based
• Non-flammable

Cross-reference: Dowtherm SR-1

Food-grade heat transfer fluid for -10 to 320°C, odourless and suitable for incidental food contact duty in baking, edible oil and packaging lines.

• Food-grade formulation
• Liquid phase to 320°C

Ultra-high temperature synthetic fluid for -20 to 400°C with strong thermal stability and low fouling tendency.

• Up to 400°C
• Fouling resistant, long life

High temperature synthetic fluid for -15 to 390°C continuous heating and heat recovery service.

• Up to 390°C
• Continuous high temperature duty

Synthetic fluid for -30 to 380°C balancing cold start-up with high temperature operation.

• Cold start at -30°C
• Up to 380°C

Synthetic fluid for -20 to 370°C with low viscosity and pumping cost for large-flow high temperature loops.

• Low viscosity, low pumping cost
• Up to 370°C

Colourless, odourless high-purity synthetic fluid with very low pour point and viscosity plus a high flash point — excellent cold flow and high-temperature stability for combined hot/cold duty.

• Pour point below -55°C
• Only 6.2 mm²/s at 40°C
• Flash 172°C, autoignition >360°C

Cross-reference: Therminol 59 · Dowtherm Q · Marlotherm LH

-30 to 330°C synthetic fluid combining a low pour point with a very high flash point and high purity; recyclable and suited to fire-safety-driven plant designs.

• Pour point below -47°C, flash 205°C
• Service up to 330°C
• Autoignition >400°C, recyclable

Cross-reference: Therminol 66 · Dowtherm RP · Marlotherm SH

0 to 320°C fire-resistant synthetic fluid with a 304°C open-cup flash point and >400°C autoignition; excellent coking and oxidation resistance, readily biodegradable.

• Open-cup flash 304°C
• Autoignition >400°C
• Readily biodegradable

Cross-reference: Therminol L-60 · Marlotherm SH

0 to 320°C fire-resistant synthetic fluid with an open-cup flash point of 320°C, strong oxidation and coking resistance for fire-code-critical plants.

• Open-cup flash 320°C
• Autoignition >400°C
• Coking resistant, long life

Cross-reference: Therminol L-60 · Marlotherm SH

Food-grade fluid made from deeply dewaxed hydrogenated base oil: odourless, non-toxic, chemically inert and low-volatility, certified to NSF and FDA food-grade standards for food and pharma duty.

• NSF / FDA food-grade certified
• Odourless, non-toxic, inert
• Boiling above 330°C

-20 to 330°C single-phase immersion coolant with 39.4 kV dielectric strength, >240°C flash and >400°C boiling point, plus lubricity and oxidation stability for storage, data centres, EV powertrains and DC chargers.

• 39.4 kV dielectric strength
• Flash >240°C, boiling >400°C
• Pour point below -60°C, -20 to 330°C

Cross-reference: Shell Immersion Cooling Fluid S5

-50 to 250°C low-viscosity single-phase immersion coolant: 2.1 mm²/s at 40°C, 45 kV breakdown voltage and 2.08 dielectric constant, with excellent cold flow for storage, data centres, EV systems and chip testing.

• Only 2.1 mm²/s at 40°C
• 45 kV breakdown voltage
• Pour point below -60°C

Cross-reference: Shell Immersion Cooling Fluid S3