What is the difference between the light resistance and the weatherability of the pigment?
Many paint (or dyes) as a colorant in the application of the need to maintain the inherent color of the stability. The light resistance of the pigment is defined as the quality index of the pigment resistant to sunlight.
In the composition of the daylight, the most destructive part of the light resistance of the pigment is ultraviolet (UV). In discussing the lightfastness of the pigment, it is only an assessment of the quality of the pigment's ability to withstand the light environment in the external environment.
In fact, it is difficult to make an accurate definition of the weather conditions.
From a certain point of view, the exclusion of other external seasonal factors of pigment light resistance indicators may help the field stability of the coating given a practical and reproducible objective evaluation. Pigment weather resistance indicators are affected by a variety of external environmental factors, including sunlight, high-energy ultraviolet radiation, temperature, humidity and atmospheric and various impurities in the erosion.
Pigment weather resistance indicators can be used outdoor outdoor exposure experiments or indoor use of artificial atmospheric aging equipment to simulate the field environment for measurement. Outdoor exposure experiments usually select specific locations as experimental sites, and these experimental sites are often areas where the climatic conditions are very severe (strong sun, heavily polluted industrial atmospheres, etc.), the most famous outdoor exposure site is Florida The The sample plate will typically be placed in the direction of 5 ° in the positive direction for 12 months or longer exposure to outdoor exposure experiments.