Weather resistanceRefers to objects or materials, such as coatings, building plastics, rubber products, etc., used in outdoor natural conditions, its quality to withstand the test of climate (such as light, hot and cold, wind and rain, bacteria, etc.), its tolerance is called weather resistance.

For plastic products, weather resistance refers to a series of aging phenomena such as fading, discoloration, cracking, pulverization and strength decline due to the influence of external conditions such as sunlight, temperature changes, wind and rain. Among them, ultraviolet radiation is the key factor to promote the aging of plastics.
This refers specifically to the color stability of pigments under natural conditions.

Under normal circumstances, the sample is placed outdoors with an inclination of 45 degrees and a front facing south. In China, the latitude of Guangzhou Tianhe sunning field is generally 23 08 'as the standard, and regular comparative tests are carried out to observe its color changes. The domestic weather resistance standard is the 5-level representation of the GB250-1984 color fastness fading sample card (gray card). The international standard is ISO Grey scale(1~5), and grade 5 is the best.

The weatherability of pigments is mainly determined by the chemical structure. Organic pigments, especially azo and lake pigments, have poor weatherability, while inorganic pigments, especially metal oxide mixed phase inorganic pigments, have excellent weatherability.
International for a variety of materials and different use of the development of a variety of weather resistance determination methods, such as a variety of aging tests, simulated natural climatic conditions for testing. Such as coating weatherability test, also known as atmospheric exposure test, assessment of the durability of the coating itself to the atmosphere. The weather resistance of plastic leather can be measured in a weather test chamber (or aging box, accelerated weather meter) that simulates the natural climate.