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Light, high temperature and humidity, any of these three factors can cause aging damage to materials, but they often act at the same time, and the harm caused will be greater than any one of the factors alone
.
1.
Xenon lamp weathering resistance test box - light: Different materials have different sensitivity to light
.
For durable materials, such as most paints, plastics, the short wavelength band of UV light is responsible for the aging of most polymers
.
However, for less durable materials, such as some pigments and dyes, the long wavelengths of UV light and even visible light can cause severe aging
.
2.
Xenon lamp weathering resistance test chamber - high temperature: When the temperature rises, the destructive effect of light will also increase
.
Although temperature does not affect the primary photoreaction, it affects the secondary chemical reaction
.
The temperature control that laboratory aging tests must provide, usually by means of elevated temperatures, to accelerate the aging process
.
3.
Xenon lamp weathering resistance test chamber - humidity: Dew, rain and high humidity are the main causes of humidity hazards
.
Studies have shown that items placed outdoors will be wet for long periods of time (average 8-12 h per day)
.
The study found that dew formed by moisture is the main factor in outdoor humidity, and dew is more harmful than rain because it Adhering to the material for a longer time, causing more serious moisture absorption
.
Of course, the rain is also very harmful to the material, and the rain will cause thermal shock
.
For example, a car whose temperature rises in a hot summer is suddenly affected by a shower And the rapid cooling will produce shock phenomenon
.
Mechanical erosion caused by rain washing can also accelerate the aging of materials.
For example, the surface aging layer of wood coatings is removed by rain washing, and the unaged inner layer is exposed to sunlight, resulting in further aging
.
.
1.
Xenon lamp weathering resistance test box - light: Different materials have different sensitivity to light
.
For durable materials, such as most paints, plastics, the short wavelength band of UV light is responsible for the aging of most polymers
.
However, for less durable materials, such as some pigments and dyes, the long wavelengths of UV light and even visible light can cause severe aging
.
2.
Xenon lamp weathering resistance test chamber - high temperature: When the temperature rises, the destructive effect of light will also increase
.
Although temperature does not affect the primary photoreaction, it affects the secondary chemical reaction
.
The temperature control that laboratory aging tests must provide, usually by means of elevated temperatures, to accelerate the aging process
.
3.
Xenon lamp weathering resistance test chamber - humidity: Dew, rain and high humidity are the main causes of humidity hazards
.
Studies have shown that items placed outdoors will be wet for long periods of time (average 8-12 h per day)
.
The study found that dew formed by moisture is the main factor in outdoor humidity, and dew is more harmful than rain because it Adhering to the material for a longer time, causing more serious moisture absorption
.
Of course, the rain is also very harmful to the material, and the rain will cause thermal shock
.
For example, a car whose temperature rises in a hot summer is suddenly affected by a shower And the rapid cooling will produce shock phenomenon
.
Mechanical erosion caused by rain washing can also accelerate the aging of materials.
For example, the surface aging layer of wood coatings is removed by rain washing, and the unaged inner layer is exposed to sunlight, resulting in further aging
.
