Methods of testing PEX plastics: Accelerated climatic tests
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Many of the data relating to the evaluation of aging of PEX materials obtained by the methods of accelerated environmental tests and in real exposure to the open-air. Accelerated testing can reduce the time needed to obtain the required results, which helps to hold fast enough sampling with various combination of additives and the relations between them. To do this, use a variety of light sources that simulate sunlight. As artificial light sources are used, in particular, carbon and xenon arc lamps, fluorescent solar and mercury lamps. All of these sources, except for fluorescent lamps, can generate radiation is much more powerful than natural sunlight. At wavelengths comparable xenon arc lamps can generate radiation at two times better than the power of the most bright sunlight over a wide frequency range.
Often artificial light sources are used for simulating fracture of polymers, combining exposure to sunlight and water (rain or dew). In modern devices provide devices that allow the simultaneous spraying of the samples above and / or rear to simulate the effects of moisture.
There are three main methods of accelerated climatic tests:
• exhibit a carbon arc lamp;
• exposure under a xenon arc lamp;
• exposure under fluorescent ultraviolet lamp.
Light xenon arc lamp with a right filter most closely simulates the spectrum of solar radiation.
Tags: carbon, climatic tests, PEX, Testing, xenon
