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What is UV test?Why do you want UV aging test?What are the standards for UV aging test?

2021-11-18

About UV testing you need to understand the knowledge:

Why do you want UV testing? What are the lights in the UV test? What is the wavelength of UV aging tester?

UV test is also known as UV aging test, which is the process of strengthening the experiment in the case of aging of the product in real usage conditions, UV aging test experiment For plastic materials, common aging mainly include light aging, moisture and heat aging, and thermal aging.

Some outdoor products have been exposed to the sun for a long time, so the yellow-resistant test of the product is very important. To understand the life of the product outdoors, it is necessary to perform an ultraviolet aging test simulation test, which is the UV test. Due to the intensity of the UV test in the laboratory, the UV aging test test can save staff. Test time, get the service life of the product outdoor in a short time.

QSQ-lab production of QUV aging testers have three lamps for UV testing:

● UVA-340 lamp Tube

The short-wave ultraviolet light in the solar light can be greatly simulated from 365 nm to the wavelength range of the solar cut-off point 295 nm, which is mainly used for the photocondens of outdoor products;

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● UVB-313 lamp tube

The short-wave ultraviolet light is typically illuminated in the solar ultraviolet rays that are often irradiated on the surface of the earth, so that the material aging can be maximized. However, the lamp may cause non-practical damage to certain materials. The UVB-313 lamp is mainly used for quality control and research development, or testing materials with strong weather resistance.

● UVA-351 lamp

UVA-351 lamp is mainly used to simulate the effect of the solar light through the window glass. Tests for indoor materials are very useful. 2. What products do you want to do UV test?

UV test is very important, UV aging test is mainly used to test plastics, lamps, paint inks, resins, print packaging, aluminum profiles, automotive motorcycle industries, cosmetics, etc., very wide range .

Meet the standard type standard General ASTM D 4459 ASTM G 154 ISO 4892 IEC 60068 ISO 4892-1 ASTM G151 ASTM G154 JISD0205 SAEJ2020 plastic ISO4892-3 ANSIC57.12.28 ANSI, A14.5 ASTMD4329 ASTMD4674 ASTMD5208 ASTMD6662 DIN 53384 UI K 3750 UNE35 104 coating ASTM D3794 ASTM D4587 FED-STD-141B GM 9125P JIS K 5600-7-8 ISO 11507 ISO 20340 M598-1990 NACE TM-01-84 NISSAN M0007 PrEN 927-6 textiles AATCC TM 186 ACFFA GUIDELINE roofing ANSI / RMAIPR-1-1990 ASTM D4799 ASTM D4811 ASTM D3105 ASTM D4434 BS D5019 BS 903: PARTA54 CGSB-37.54-M DIN EN534 Printed Ink / Art Materials ASTM D3424 ASTMF 1945

4. Which of theUV test
Is the instrument brand?
QUV UV aging test box is the world's most widely used UV test aging machine. In just a few weeks or months, the use of QUV ultraviolet light accelerated aging testers can be reproducible, reliable aging test data. Its short-wavelength ultraviolet light and condensation cycle systems can realistically simulate the destruction of materials such as sunlight, dew and rain.

5. Misunderstanding for UV test

UV How many days are equivalent to outdoor? UV test 2000 hours equivalent?

From the in theory, it is impossible to calculate the time of the outdoor exposure through a single magic coefficient, multiplying a small number of hours exposed in the aging test chamber. The problem is not that we have not developed an accurate aging test chamber. Whether you have made more precision or expensive aging test chambers, you can't find the so-called magic factor. The biggest problem is the variability and complexity inherent in the outdoor exposure environment. The relationship between the test chamber exposure and outdoor exposure is affected by a series of variable factors.Including:

● The geographic latitude of the exposed field (closer to the equator, the stronger UV radiation).

● Altitude (higher altitude, stronger UV radiation).

● Local geographical features, such as winds can blow dry test samples, and approach the water to facilitate the formation of dew. ● The change in the year of annual weather will lead to the difference between the aging effect of the same location in the adjacent year to 2: 1

● Seasonal change (for example, winter exposure effect may Only the summer exposure effect is 1/7). ● Sample towards (5 ° angle or vertical facing north toward). ● Sample insulation (outdoor sample with backplane is often 50% faster than the aging speed of the backplane sample).

● Test chamber operating cycle (light and wet hours).

● Test temperature of the test chamber (the faster, the faster).

● Test material characteristics.

● Spectral Power Distribution (SPD) of the experimental light source.

Obviously, it is meaningless to discuss the conversion factor between accelerated aging hours and how many months in outdoor exposure. One is the constant condition, and the other condition is changing. Looking for a conversion factor, often exceeding the effective range of the data. That is, aging data is relative data.

Despite this, you can also get useful weathering data from accelerated aging test chambers. However, you must recognize that the data you get is relative data, not absolute data. You can expect from laboratory aging tests that a material is compared to other materials Reliable information. In fact, there is also the same situation about Florida exposure test. No one knows how to compare the black box exposure in the South 5 ° angle of 1 year. Even outdoor testing can only provide information about the actual service life.

However, the role of comparison data is powerful. For example, you may find a subtle change of the recipe, which may make the weather resistance of your material by twice. Perhaps you will find that several suppliers have the same materials, some aging is very fast, mostly aged in the medium-time period, only a small number of exposed daily exposure. Perhaps you find an unuuble material, you have the same weather resistance with the standard materials that do you actually use 5 years. Here is a very good example of reflecting relative data functions. A coating producer has developed a new type of varnish. The initial UV aging box QUV test has severe cracking in 200 to 400 hours. Thismuch faster than the conventional coatings of the same use. However, after three years of uninterrupted formulation improvements, the coatings of several formulations can withstand the exposure of UV aging QUV 2,000 to 4,000 hours, than ordinaryCoating weather resistance is much better. Subsequent parallel tests in Florida show that there is similar 10: 1 in terms of weather resistance. However, if the coating chemist has been waiting for Florida before changing their formula, they may still stay in the early stage of formula development, and the paint will not achieve business success like now.

On the other hand, if you still insist on finding a rough acceleration factor, you need to find it through experience. Although it is impossible to find a universal acceleration factor, hundreds of laboratories have successfully developed their own acceleration factor to convert their QSQSQ-lab or QUV exposure time to the outdoor exposure time. However, remember thisvery important: their acceleration factor is obtained from their own acceleration test and outdoor test. Moreover, the acceleration factor is only applicable to:

● Specific test materials.

● Specific test chamber cycle time and temperature.

● Specific outdoor exposure to the grounding point and sample installation method.

If your material is exposed outdoor, you can find your own acceleration factor in a few months. If you don't have this experience on your own materials, you can use comparison materials that have been tested outdoors as a reference.

Qinsun 40-year-old American QSQSQ-lab aging test instrument, welcome to call [400-6808-138] consultation.

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