In the course of energy-related façade renovation with external thermal insulation composite systems (ETICS), there is an unmistakable trend towards more intensive colours on façades. Customers increasingly want darker colours. The problem is that dark surfaces heat up more than light ones when exposed to sunlight. In addition, the surfaces of ETICS heat up much more intensively than solid stone masonry. Therefore, the plaster shell of an ETICS is exposed to great stresses due to the occurring, strong temperature fluctuations of the surface. Cracks and deformations are the result. If one analyses the pigment composition of dark shades with a HBW <20, one quickly finds that black pigments play a central role. The darker and thus more colour-neutral the shade, the blacker pigment is used.
The aim is to avoid the risk of damage to the plaster shell with the help of infrared-reflecting pigments.
Pigment Black 32 (Cool Black) is a high performance organic perylene pigment. It has different chemical compositions and a very high fastness standard.
The total solar reflectance (TSR) and the right choice of infrared reflecting pigments are the key factors to achieve a reflective cool coating or any other type of surface material.
The pigment (Cool Black) is of course REACH-registered and is already used by leading European manufacturers.
The Cool Black is used for infrared reflective coatings, stoving systems, waterborne systems, acrylic isocyanate systems, acid curing systems, amine curing systems and air-drying systems.
The Cool Black offers the following advantages:
- Avoiding damage to the plaster shell
- Cooler Surface temperature
- Use of darker shades possible
- Color stability in all silicate, silicone resin and dispersion facade paints
With the help of the TSR value, the heating of façade surfaces can be represented and predicted. By using suitable pigments with optimized NIR reflectivity, surface temperatures can be reduced by up to ten Kelvin. In practice, however, temperatures of over 70 degrees Celsius cannot be avoided. Carbon black and iron oxide pigments are mainly responsible for heating and should not be used. Inorganic black pigments such as Cool Black with increased NIR reflectivity enable coatings with optimized TSR values, reduced heating and very good color stability in all silicate, silicone resin and dispersion facade paints.
For more information, please download the technical data sheet. Click here to download: