test chambers
THE SUSTAINABLE
REFRIGERANT
SUITABLE FOR
CLIMATIC TESTING
The new WT69 refrigerant replaces R23 in
deep-freeze applications down to -70°C and
reduces GWP by more than 90%
// JANKO FÖRSTER
The next stage of the EU refrigerant
regulation / F-gas regulation 517/2014
will come into effect on January 1,
2020. At present, alternatives to R23
refrigerant, which can only be used under
restricted circumstances, for use in deepfreeze
systems for environmental
simulation have yet to be found. Until now,
that is. Weiss Technik is proud to present
its completely newly developed WT69
refrigerant in a ClimeEvent climate test
chamber. WT69 has a GWP (global
warming potential) reduced by 90% to 1357
and is the ideal solution for use in deepfreeze
systems reaching temperatures as
low as -70°C. It does not compromise in
terms of performance, use and costeffectiveness,
while reliably delivering
comparable test results. It is also non-
flammable, non-toxic and non-corrosive.
By the end of the year, the future-proof
WT69 refrigerant will be used in all
compact ClimeEvent standard climate test
chambers with a cooling rate of between 3
and 5 Kelvin. From 2020, special models
such as vibration cabinets and larger
climate test chambers with temperaturechanging
rates of up to 20 Kelvin will also
change over to this new refrigerant. Janko
Förster, head of product management says,
“WT69 isn’t just another refrigerant. It’s a
real innovation for deep-freeze applications
and a real replacement for R23. It fullfills
technological as well as ecological and
economic demands perfectly.”
WT69 is the result of several years of
development work carried out by Weiss
Technik in collaboration with Dresden
172 SHOWCASE 2020 \\ AEROSPACETESTINGINTERNATIONAL.COM
1 // The ClimeEvent
premium climate test
chamber now contains
WT69 instead of R23
2 // When it comes to the
main function of the
climate chamber, namely
being able to extract heat
from the test specimen,
there is no difference
between R23 and WT69
3 // The rate of change of
temperature in the case of
WT69 is better than that of
R23 down to below -55°C
1
University of Technology. It will be
independently produced and distributed by
the company Technische Gase und
Gastechnik (TEGA), which will ensure the
safe and professional handling of WT69
from production through to filling and
right through to sales and transport.
WT69 will be freely available on the
market and can also be used in other
systems as needed.
CHEMICAL PRINCIPLES
The first stage of development of WT69
involved investigations into whether a
naturally occurring pure substance could
be considered as an alternative to R23 for
climate technology requirements. Given
that this was not the case, tests were
carried out to determine which CO2
/AEROSPACETESTINGINTERNATIONAL.COM