Four environmental factors affecting UV aging test chambers

The ultraviolet aging test chamber adopts fluorescent ultraviolet lamp as the light source, and accelerates the weatherability test of the material by simulating the ultraviolet radiation in natural sunlight to obtain the results
of the material's weather resistance.
The environmental factors affecting UV aging test chambers include humidity, airflow velocity, surface contamination and ozone, which will be described below
.
The first factor affecting the UV aging test chamber is humidity, under different humidity conditions, the photochemical deterioration effect of various materials, coatings, and plastics and other substances is very different, and their requirements for humidity conditions are not the same, so the specific humidity conditions are clearly stipulated
by the relevant specifications.
The second factor affecting the UV aging test chamber is the airflow velocity, and the size of the airflow velocity close to the sample surface not only affects the temperature rise of the sample, but also makes the open thermopile that monitors the radiation intensity appear to have a significant error
.
Airflow velocities should be monitored and as low as possible
.
In addition, when adjusting the temperature in the UV aging test chamber, high-speed airflow
can be avoided by heating or cooling the tank wall.
The third factor affecting UV aging test chambers is surface contamination, where dust and other surface contaminants can seriously alter the absorption characteristics
of the surface of the exposed object.
The sample should be kept clean
during the test.
The fourth factor affecting the UV aging test chamber is ozone and other polluting gases, the ozone produced by the box under the short-wave ultraviolet radiation of the light source, usually can be discharged from the ultraviolet aging test chamber by the radiation filter that corrects the spectral energy distribution, because ozone and other polluting gases will affect the deterioration process of some materials, unless otherwise specified in the relevant specifications, these harmful gases must be discharged out of the
box.