Translucent, light-diffusing glass
Facades Glazings Ceilings Partitions
Roofs Domes Doors
TERMOLUX is a special insulating glass that scatters light and reflects
the sun's rays. It is composed of at least two glass panes and
a layer of spun glass fibres between them. The fibres of the spun
glass lie on top of each other at specific angles to give a high light
scatter effect. TERMOLUX is hermetically sealed around the edges
by an organic sealant against outside influences. It is therefore impossible
to cut or shape TERMOLUX panes.
TERMOLUX is a diffusing and insulating glazing that reflects the sun's
rays. Its foremost characteristic is diffusion, an effect which is most intensive
when the sun shines. As with all diffusing glasses, workplaces
should therefore be arranged in such a way that sunlit panes are not in
the centre of the field of vision. A type with 3 mm spun glass is recommended
for sports halls, where freedom from glare is wanted.
As a roof glazing TERMOLUX protects the interior against excessive
solar radiation. Rooflights glazed with TERMOLUX produce, in addition
to a completely uniform light diffusion, an excellent in-depth interior
illumination due to the additional reflection from the interior ceiling.
TERMOLUX creates northlight conditions irrespective of its orientation,
and its neutral light prevents shifts in colours. Because of its very
good colour rendering index, TERMOLUX is often used in museums
and exhibitions, printing works, fashion houses, and also schools and
For the installation of the glazing, the same guidelines and standards
apply as for all insulating glasses. For glazing under compression
stress, the load must be equally distributed over all four sides, just as
a load distributed over length. In the case of dry glazings it is recommended
to contact the manufacturer.
Special installation prescriptions are applicable to TERMOLUX K-SPECIAL, and are available on request.
The heat transmission factor U is 3.8 W/m2K for TERMOLUX with
2 x float 4 mm and a 1.5 mm spun glass layer, this being a substantial
improvement over simple glazing. TERMOLUX COMBI gives values
from 2.2 to 0.7 W/m2K, a considerable improvement over ordinary insulated
glazing. With TERMOLUX K-SPECIAL, the U-value increases
with the thickness of the capillary layer up to the outstanding value of
Total energy transmission
The total energy transmission factor g for TERMOLUX with 2 x float
4 mm and a 1.5 mm spun glass layer is equal to 44 %, while for
TERMOLUX-K-SPECIAL with a 12 mm capillary layer the factor is 31 %.
These are extremely good values if one considers that for 4 mm float
glass alone the factor g is 87 %. By using special combinations, g
values under 20 % can be obtained.
According to measurements made by the Swiss Materials Testing Laboratory
EMPA, the airborne sound insulation factor Rw of TERMOLUX2 x 4 mm with 1.5 mm spun glass fibres is 32 dB, and with 3 mm spun
glass it is 34 dB. In TERMOLUX K-SPECIAL with a 16 mm capillary
layer it is also 34 dB.
TERMOLUX offers a glare-free and shadow-free diffused light which
is pleasant to the eye and is constant irrespective of the angle of incidence.
TERMOLUX always gives the same conditions as if the light
came from the north, independently of its actual orientation. This gives
a feeling of lightness which is not measurable but has an apparent effect
far superior to the light transmission factor of 46 % for TERMOLUXfrom 2 x float 4 mm with 1.5 mm spun glass and 27 % with 3 mm
When falling on or passing through any material or building part, light
undergoes a change. This change can be described quantitatively by
means of various coefficients, making it possible to precisely characterise
any material or building part.
The light transmission factorcharacterises the light transmission of a body or a building part, but says nothing about the distribution of light. The half-value angledetermines the direction from which the intensity of the transmitted light is equal to half the intensity at a right angle to the building part, and is therefore suitable for determining the diffusion of light. The very high values of TERMOLUX with 47° and TERMOLUX K-SPECIAL with 38° illustrate the very good light diffusion that results from the spun glass fibres. TERMOLUX is absolutely stable to light and cannot become yellow, since the intermediate layer is made from spun glass fibres. It also offers protection from ultra-violet rays for objects placed behind it.
||kg / m²
| 2 x 3 mm
||7 - 8
||80 x 200
| 2 x 4 mm
||9 - 10
||120 x 250
| 2 x 6 mm
||13 - 14
||180 x 300
| 2 x 4 mm
glass-fibers 3 mm
|11 - 12
||120 x 250
| 1 x wire glass 6 - 7 mm
1 x raw glass 5 - 6 mm
|13 - 14
||80 x 380
| 2 x wire glass 6 - 7 mm
||14 - 15
||85 x 400
* test results