© Wikora GmbH
Page 15
Status: 27.04.2015
Errors excepted.
8 Solar fluid
8.1 Product information Solarliquid ready for use (WIK-PE20)
Environmentally friendly, ready-to-use long-term antifreeze with corrosion inhibitors especially for flat plate and
vacuum tube collectors with a high thermal load (up to 260 °C).
Product data:
Appearance:
clear, amber liquid
Base:
superior glycol
Flashpoint (°C):
> 100 (ASTM D 51758)
Boiling point (°C):
> 102 (ASTM D 1120)
Density (20 °C):
1.02 – 1.04 g/cm³ (DIN 51757)
Antifreeze (crystallization point): approx. -23 °C
Antifreeze (solidification point):
approx. -29 °C
pH value (20 °C):
7.5 – 8.5 (ASTM D 1287)
Viscosity (20 °C):
approx. 15.0 mm²/s
Product properties:
SOLARLIQUID HT ready for use
is an odorless liquid that is used as antifreeze or heat transfer fluid for thermal solar
installations (flat plate and vacuum tube collectors) with a high thermal load. The special corrosion inhibitors protect the metal
and plastic materials commonly used in construction, including aluminium, against corrosion and deposits. The sealing
materials commonly used in heating installations are not affeced by Solarliquid HT ready for use.
SOLARLIQUID HT ready for use
cannot be mixed with any other type of antifreeze
is inhibited nitrite-, amine- and phosphate-free
is biodegradable
According to the German Ordinance on Hazardous Substances, no specific labeling is required for Solarliquid L concentrate
ready for use and HT ready for use (see safety data sheet).
General information:
The systems must conform to DIN standard 4757, part 1, and be implemented as a closed system, since there must be no
atmospheric oxygen in the system. It must be ensured that the circulating pump is suitable for operation with antifreeze agents.
Before being filled, the system should be flushed with water and the tightness of all connections checked through pressure
testing. The system must be free of impurities and free of other liquids. There must be no deposits on the metal surfaces. After
pressure testing, the system must immediately be filled with Solarliquid HT ready for use. Do not allow any air to enter!
Galvanized system components should be avoided since zinc is not resistant to glycols. In the case of leakage, only top up with
the same product, never utilize different solar liquids in the same system. In our experience, Solarliquid HT ready for use can
be stored or used for several years. Nonetheless, the concentration (frost resistance) should be checked annually. In the case
of a loss of liquid, never top up with water.
Use only Solarliquid HT ready for use for topping up!
Recommendation for use:
The optimum temperature for use is between -23 °C and 230 °C. For prolonged temperatures of more than 230 °C we
recommend installing adequately large expansion tanks so that the heat transfer fluid can flow out of the collectors.
Method of testing corrosion properties:
We recommend that the solar fluid with which the system is filled be checked regularly (roughly annually). With the pH value
you can test the corrosion properties of our solar fluid. The pH value should be > 7.5. This is measured using pH test strips. If
the value is lower than this, the solar fluid should be replaced.
Method of testing frost protection:
Krüss device
Refractometer
Frost
protection
Brix
RI
MEG scale
MPG scale
-8 °C
22.3
1.3676
-17 °C
-13 °C
-15 °C
29.6
1.3807
-29 °C
-22 °C
-23 °C
35.7
1.3915
-46 °C
-35 °C
