What is weather resistance? Introduction to weathering test items of environmental test

Date：2021-10-18 16:56:00 Views：3478

What is weather resistance? Weather resistance, also known as reliability test, refers to a series of aging phenomena such as fading, discoloration, cracking, pulverization and strength decline of materials such as coatings, building plastics and rubber products due to the influence of external conditions such as sunlight, temperature change, wind and rain. Ultraviolet radiation is the key factor to promote the aging of plastics.

1、 Weather resistance test includes:

Heat resistance, freeze-thaw resistance, impact resistance, wear resistance, yellowing resistance, light aging resistance, alkali resistance, acid and alkali resistance, stain resistance, washing resistance, salt spray resistance, damp heat resistance, liquid medium resistance and water resistance

2、 Weather resistance test method:

1. Natural climate

Natural outdoor testing requires specimens to be exposed to sunlight and the atmosphere, either directly or with glass baffles. Two benchmark climates are often used to test products in the United States: the humid and hot subtropical Florida climate and the dry and hot Arizona desert climate. The climate in other places is suitable for other markets. For example, atlas has 25 climate tests in Europe. Outdoor testing often adopts annual irradiation and weathering treatment, which varies with time.

2. Although outdoor

When we want to be more exposed to solar radiation, we can use solar tracker or centralized processing system to directly expose to real outdoor weathering conditions to obtain faster outdoor testing. These test methods can provide effective results at least eight times faster than the original real time weathering.

3. Laboratory simulation

The laboratory test uses the test chamber with special environment and artificial light source, which can provide excellent repeatability and reproducibility, similar to the results obtained under real time conditions, but many times faster. Different environmental controls and lamp sources (such as fluorescence, carbon argon arc, or metal halide) can be used. Each has unique spectral characteristics and can match several key wavelengths of sunlight to predict the performance of the product.

4. Testing instrument

Gas chromatography (GC) UV, UV spectrophotometer atomic absorption spectrometry (AAS)

Liquid chromatography (LC) X-ray fluorescence spectroscopy, XRFX X-ray diffractometer (XRD)

Infrared spectroscopy (IR, Fourier) gas chromatography-mass spectrometry (GC-MS) liquid chromatography-mass spectrometry (LC-MS)

Weather resistance test standard:

GBT 1767-1979 determination of weather resistance of paint films

Aatcc111-2003 weather resistance of fabric: exposure to sunlight and climate

Jbzq3571-1986 test method for weather resistance of vulcanized rubber

GBT 3511-2008 weather resistance of vulcanized rubber or thermoplastic rubber

JIS D0205-1987 test method for weather resistance of automobile parts

CNS 11232-1985 argon arc lamp type optical rotation resistance and weather resistance tester

CB11793. 3-1989test method for mechanical properties and weather resistance of PVC plastic windows

GBT 11793-2008 test method for mechanical properties and weather resistance of unplasticized polyvinyl chloride (PVC-U) plastic doors and windows

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