Thermox DTX Physical Properties


1.04 - 1.15 g/cm³


7.5 - 10.5 depending on inhibitors

Boiling Point:



a clear, slightly viscous liquid. It is mildly sweet to the taste and has a non-pungent but characteristic aroma.

Available in:

5, 10, 15, 20, 25, 205 & 1000 litre containers and bulk tankers.


For a quote or assistance

Tel: +44 (0) 1792 586800

High Efficiency Non-Toxic Heat Transfer Fluid with Antifreeze Function. Based on Ethylene Glycol blended with patented DeTox™ additive and BS6580 & ASTM D1384 proven Corrosion, Scale and Biological Inhibitors.

Thermox DTX has been especially formulated for use in Geothermal and Air Source heating systems, to exploit the advantages Ethylene Glycol has over Propylene Glycol - whilst delivering a non-toxic solution. Specifically;

Antifreeze AntiFreeze

Thermox DTX is miscible with water in all proportions and can protect Geothermal and Air Source systems down to -50°C depending on concentration.

non toxic Non-Toxic

Although based on Ethylene Glycol, Thermox DTX has been tested and classified as Non-Toxic by an EPA certified laboratory. Previously Propylene Glycol was the only non-toxic glycol available, that is no longer the case. Hydratech in alliance with Evans Cooling Systems, Inc. have developed and patented the DeTox® additive. DeTox® prevents Ethylene Glycol from being metabolised (during digestion) into toxic by-products, which cause kidney failure, blindness and death. Tests carried out on Thermox DTX confirmed the toxicity was "so low that it was impossible to determine an LD50 value".

The DeTox® additive has very little effect on heat transfer or antifreeze performance. In fact similar volumes of Thermox DTX or Ethylene Glycol are required to achieve a specific freeze protection.

Optimum Flow Optimum Flow

Thermox DTX has improved heat transfer characteristics. Including lower Dynamic Viscosity and higher Thermal Conductivity. For detailed comparison please refer to the Fluid Performance Chart - available upon request.

Corrosion control Corrosion Control

Thermox DTX contains synergistic corrosion inhibitors to protect metals commonly found in such systems. It has been independently tested and found to meet BS6580 and ASTM D1384 corrosion standards. Thermox DTX also contains scale and biological inhibitors to help prevent fouling – thus promoting long operational life and high thermal efficiency.

Biodegradable Biodegradable

Thermox DTX mixtures are readily biodegradable (90% over ten days) and will not remain in the environment or bio-accumulate.

Quality Assured Quality Assured

All Hydratech products are manufactured in accordance with certified ISO9001-2008 procedures


As per BSRIA guide BG 29/2012 all pipe-work systems should be clean and free from biological contamination and debris prior to commissioning.

To minimise corrosion air ingress should be minimized. A pressurised system is best.

Determine the total system volume and add Thermox DTX to the system according to the minimum operating temperature required (see table). The minimum dose of Thermox DTX should not be less than 22% of the system volume and the maximum does not normally exceed 60%. We recommend the use of deionised, distilled or UltraPure™ water for this dilution. Avoid water containing high levels of calcium salts or Chlorides [Cl-].

Health & Safety: Please refer to the associated Safety Data Sheet. Available by Login or upon request.

Shelf Life: >3 years when stored in sealed containers out of direct sunlight.

Available in: 5, 10, 15, 20, 25, 205 & 1000 litre containers and bulk tankers.

Thermox DTX can be supplied as a Ready-To-Use solution.

Mixing Guide

Frost Protection °C v/v of Thermox DTX Refractive Index
-10 22% 1.356
-15 28% 1.362
-20 33% 1.367
-25 38% 1.372
-30 42% 1.376
-35 46% 1.380

When measuring the percentage of Thermox DTX in the system use a refractometer

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