UV (ulraviolide) survival tests are a test method used to determine the shelf-life of the products made between UVA UVB rays and stability tests. These tests are mainly done to detect and verify the shelf life of many products, including cosmetics and medical products.
TÜRCERT provides accelerated aging test for polymer and plastic materials and products.
It is expected that the UV aging tests are expected to maintain microbiological characteristics of the products during the waiting period on shelves and there is no deterioration in their physicochemical structure.
Accelerated Weather Testing The UV Test Chamber can replicate damage caused by sunlight, rain and dew. The UV aging test is carried out by exposing the material to be tested to a controlled cycling cycle of sunlight and moisture while increasing the temperature.
The test determines how long a material, tool, or equipment you use in your daily life will last for an extended period of time in the external atmospheric environment or under special conditions.
The UV test chamber uses ultraviolet fluorescent lamps to mimic the sun; it also uses a spray to simulate the effect of condensation or moisture. Other areas of aviation, automotive, white goods, scientific research and other testing equipment for schools, factories, military, research-bits and other units.
Application industry (not limited to:)
- Paint, ink, resin, plastic
- Printing and packaging, aluminum, adhesives
- Motorcycle industry, cosmetics,
- Metal, electronic, electrolysis, drugs etc.
UV Accelerated Aging Tests
- Simulate the sun, rain spray, and condensation to test the material by exposing to sunlight with moisture and temperature, and damage.
- Get results evenly that the damage is open for several months after a few days or weeks. Loss includes fading, discoloration, gloss reduction, dust, crack, turbidity, fragility, strength reduction and oxidation.
- Reference the test data for the improvement of existing materials or evaluating the effect of changes in product durability and other directions.
Such tests can normally be carried out by keeping the products really waiting. In this test management the products are kept both during normal shelf life and the ambient conditions are changed from time to time. For example, the temperature is increased intermittently to accelerate the process. Stability tests with increasing temperature are called accelerated aging tests. When accelerated aging tests are carried out, the products are exposed to a temperature above the temperature they are exposed to under normal conditions. In this way, the duration of the test is shortened and results are taken in less time.
However, although it is accelerated, performing these tests under normal conditions is a long and difficult method. At this point, UV (ulraviolet) survival tests are preferred to save time.
Ultraviolet rays are generally known as ultraviolet rays. These rays cannot be seen with the naked eye. There are three types of ulraviolithic rays from the sun. The UVA and UVB rays pass through the ozone layer of the earth and reach the earth. UVC rays cannot exceed the ozone layer.
These ultraviolet rays from the sun have different wavelengths and the wavelengths of the rays are measured by devices called nanometers. Humans can normally only see rays between 400 and 700 nanometer wavelengths. They cannot see the rays that remain above and below these values.
740-625 is the red color between nanometers and the rays above these values have larger wavelengths. These rays are called infrared rays. 440-380 is a purple color between nanometers and the rays below these values have smaller wavelengths. These rays are also called ultraviolet rays.
UV aging method is a method used for rapid aging tests. Air speed devices are used for this purpose. Some devices are used to shorten the test times, thus getting a faster test result.
Accelerated Weather UV test
The inner bladder of the room is made of SUS 304 steel plate, while the bladder is imported from high grade stainless steel plate.
The heating mode adopts internal bladder chute type heating with rapid temperature rise and even temperature distribution.
The UV Aging test chamber adopts the black aluminum plate to connect the temperature sensor, in conjunction with the PID SSR control system, and uses the black board temperature gauge to control the heating to ensure a more stable temperature.
The radiometer probe is fixed to prevent frequent removal and removal.
It adopts special UV radiatometer with irradiation amount, high precision display and measurement.
The radiation intensity is not more than 50W / m2.
Lighting and condensation can be controlled independently or alternatively and circularly.
The standard test sample holder contains the 75 × 150mm 2 panel. The test panels are the side walls of the cell. To properly close the compartment, it is important to fill each panel holder with samples or blank panels and replace the panel holders.
UV Accelerated Aging Tests Standards
(1) ASTM D4587: Standard Practice for Fluorescent UV-Condensation Exposures of Paints and Related Dyes
(2) ASTM D4799: Standard Application for Accelerated Air Treatment Conditions and Procedures for Bituminous Materials (Fluorescent UV, Water Spray and Condensation Method)
(3) ISO 4892-1: Plastics - Methods of Exposure to Laboratory Light Sources - Part 1: General guidance
(4) ISO 4892-3: Plastics - Methods for Exposure to Laboratory Light Sources - Part 3: Fluorescent UV Lamps
(5) ASTM D4329: Standard Practice for Fluorescent UV Exposure of Plastics
(6) AATCC TM186: Weather resistance: UV Light and Humidity Exposure
(7) ASTM D5208: Standard Application of Photodegradable Plastics' Fluorescent Ultraviolet (UV) Exposure
(8) IEC 61345: UV Test for Photovaltalic (PV) Modules
In general, the operation systems of these devices are two-stage. First, the ambient temperature, coldness and moisture content of the environment is changed and the weather conditions are created and warm steam is released on the product under test. Generally, the product is allowed to stand for four hours under these conditions. The product is then exposed to ultraviolet (UV) rays for eight hours. At this stage, 50, 100 and 150 hourly aging is realized in the products. In the 50 hourly aging processes, the products are taken from the device and color measurements are made and the test is continued.
UV (ulraviolet) survival tests are frequently used, for example, in synthetic dyestuff tests. Synthetic dyestuffs cause health problems in humans and also destroy the natural environment. For this reason, synthetic dyestuffs are subjected to UV aging tests and their effects on human health are determined in a shorter time.
Another application area of UV aging tests are wood materials used in outdoor areas. Wood building materials used in building exterior surfaces or furniture used in the garden are damaged due to sunlight, heat and humidity. UV aging tests carried out in the laboratory environment are applied ultraviolet rays and solar effect is created. In this way, the results of years of natural effects are obtained in a short time.
In the accelerated aging test, the test period is shortened by exposure to temperatures higher than the normal shelf life temperature and results are obtained in a shorter time.
Our laboratory TÜRCERT carries out detailed UV fast aging tests with a strong technological infrastructure, automation and staff.