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SINTEC Heat transfer fluid THERMAGENT-65

 High quality premium heat transfer fluid Thermagent-65» and «Thermagent-30»designed for using in heating and air
conditioning systems as well as process fluid in other heat-changers and cooling devices operating in the tempera-

ture range -65°./ -30°. to +112°.. Ingredients: high quality monoethylene glycol, demineralized water, organic (carboxylated)
corrosion inhibitors of new generation, colorant. 

Heat transfer fluids «Thermagent» have 
several advantages over other coolants 
available on the market: 
- New generation of heat transfer fluids - 
«Organic Acid technology» 
- Raw materials and components of leading 
chemical German companies. 
- Organic (carboxylated) corrosion inhibitors do not contain borax, nitrites, amines, 
phosphates and silicates. 
Heat transfer fluid «Thermagent-65» is designed for using as a low-freezing heat transfer 
fluid in closed heating systems, ventilation and air conditioning systems for residential and 
industrial buildings, for cooling systems of production equipment, chillers, refrigeration units 
etc., operating under severe climate conditions, where steel, cast iron, aluminum alloys, 
copper and its alloys are used as structural materials. It can work with any types of heating 
boilers: gas, diesel ,electric, however is not suitable for the electrolysis boilers (such as 
"Galan"), in which the heating occurs by passing an electric current through the coolant. 
The base of heat transfer fluid is high quality refined ethylene glycol in which special 
additives having anti-corrosion, anti-foam and anti-bacterial properties are added. 
Chilling point of heat transfer fluid «THERMAGENT-65» is -65°.. 
When diluting «THERMAGENT-65» with distilled or prepared water: 
- in a ratio of 60% of coolant and 40% of water: obtained heat transfer fluid with chilling point 
-25°. and solidifying at -30°.; 
- in a ratio of 65% of coolant and 35% of water: obtained heat transfer fluid with chilling point 
-30°. and not solidifying at further deceasing temperature down to -37°.; 
- in a ratio of 77% of coolant and 23% of water: obtained heat transfer fluid with chilling point 
-40°. and not solidifying at further deceasing temperature down to -47°.; 
We should admit that the undiluted heat transfer fluid is worse than water on its thermal 
physical properties. Diluting of heat transfer fluid for more than 50 % will lead to deterioration 
of its anticorrosive properties, and also to possible deposit of sediment of hardness salts 
dissolved in water in addition to freezing temperature increase. 
For heat transfer fluid dilution it is desirable to use water with hardness of 6 points. Usage of 
water with high salt content can also cause the deposit of sediment. If you don’t know the 
hardness of your water it is recommended preliminarily to mix a small amount of antifreeze 
with water in a required ratio in a clear container and verify the absence of the sediment (and 
keep the above mixture for 2 days). Before pouring the liquid into the heating system we 
recommend to test the system on the water, make a pressure text of the system to ensure 
the absence of leaks as well as the absence of impurities. As the test showed gasket seals 
made of rubber, paronite, teflon and also seal arrangement of linen, sealants sustain the 
contact with heat transfer fluid very well. 
It should be noted that heat transfer fluid has a lower surface tension coefficient than water 
so it penetrates into small and cracks easier. In addition, the swelling of rubber in the coolant 
is less than in water, so in the systems having been working on the water for a long time, the 
replacement of the water by coolant can lead to leaks related to the fact that the rubber 
gasket seals take the initial form. We recommend to monitor the conditions of system 
connections during the first days after filling of the heat transfer fluid and tighten them up or 
remove gaskets when necessary. The best protection from leaks is good gasket seals and 
high-quality assembly system. 
In the heating system elements that contain zinc, in particular, galvanized elements inside 
the tube can not be used. At temperatures above +70 ° C, the zinc coating will delaminate 
and gravitate on the heating elements of the boiler, and if the coolant is filled into the system, 
the zinc will weaken its anti-corrosion properties. 
Heat transfer fluid is designed exclusively for technical use, so do not let it transfer into foods 
and drinking water in order to avoid poisoning! In case of accidental contact with your hands 
or your clothing, it is easily washed off with water, leaving no irritation or burns. 
In operation temperature range (from +20°C to +90°C) heat transfer fluid has viscosity which 
exceeds viscosity of water in 2-3 times, and also its thermal capacity is lower than of water in 
10-15%. It should be taken into account when calculating the power of circulating pump and 
other characteristics of the system. Due to the high viscosity of the heat transfer fluid we do 
not recommend to switch on the heating boiler in the full production at once in the system 
which has cooled to subzero temperatures, but heat the system gradually. 
Attention! Lifetime of heat transfer fluid depends on the mode of its operation. It is not 
recommended to bring heat transfer fluid to the state of boiling (boiling point at atmospheric 
pressure is +106 - +116 ° C, depending on the degree of dilution with water). In case of 
overheating of heat transfer fluid to temperatures more than +170 ° C, high-temperature 
deterioration of ethylene glycol, the formation of "soot" on the heating element, evolution of 
gaseous products of decomposition and destruction of anti-corrosion additives will occur. 
Therefore, heating boilers should be provided with adequate circulation of heat transfer fluid 
and heating elements in the process must be fully immersed in the coolant to prevent them 
from overheating and heat transfer fluid from "burning". Local overheating of heat transfer 
fluid can occur at the contact points of heat transfer fluid with heating elements. If in your 
system gas emission has begun related to burning of antifreeze, then it can be eliminated by 
increasing the pump power, or reducing the power of the heating elements or by reducing the 
concentration of ethylene glycol in the coolant by means of additional dilution with water.
Anticorrosion properties of heat transfer fluid are designed for 10 years of continuous operation, or 20 heating seasons.
After this period, the coolant remains low-freezing-point liquid, but may lose or weaken its anticorrosion properties.
To restore the anticorrosion properties in heat transfer fluid you should add anti-corrosion additives,
or fill a new heat transfer fluid «THERMAGENT-65 ».


Main Physical and chemical characteristics of heat transfer fluids «THERMAGENT»

Characteristic   Unit of measurement For solution with freezing point –30 ° C For undiluted solution
Relative heat transfer coefficient at +20° C W/(m3*K) 4,7*10-4 3,0*10-4
Relative heat transfer coefficient at +100° C W/(m3*K) 9,2*10-4 7,0*10-4
Coefficient of volumetric expansion at +20° C °C-1 4,7*10-4 5,2*10-4
Coefficient of volumetric expansion at +100° C °C-1 7,4*10-4 7,6*10-4
Boiling point 1 atm  1013 mbar °C 107 116
Alkalinity (0.1H HCl) at +20° C PH 5,5 5,7
Dynamic viscosity at +20° C mPa*oC 3,5 5,9
Dynamic viscosity at +100° C mPa*oC 0,7 1
pH at +20° C °C 8,5 8
Density at +20° C g/cm3 1,063 1,085
Specific conductivity at +20° C kJ/kg *C 3,45 3,15
Specific conductivity at +100° C kJ/kg *C 3,68 3,46
Conduction at +20° C W/m*K 0,43 0,39
Conduction at +100° C W/m*K 0,42 0,36
Relativepressuredrop at +20° C   1,4 1,7
Relativepressuredrop at +100° C   0,8 1
Vapor pressure at +100° C bar 0,8 0,65

Corrosion effect on metals of heat transfer fluid «THERMAGENT -65» and water (test time 504 hours,
temperature + 90° C)

Metal Unit of measurement Tap water Diluted 50/50 –20 ° C «Thermagent -65»
CopperM1 Weight loss g/m3 per day 0,07 0,03 0,02
SolderPOS-SU40-2 Weight loss g/m3 per day 0,8 0,04 0,03
BrassL-68 Weight loss g/m3 per day 0,07 0,03 0,02
SteelSt20, St10 Weight loss g/m3 per day 5,4 0,02 0,01
Cast iron Sch20, Svh25 Weight loss g/m3 per day 13,7 0,02 0,01
Aluminum  Al-9 Weight loss g/m3 per day 3,7 0,02 0,01


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