Limitations of field tests of polymer
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These are the serious limitations of field tests of polymer samples:
• chemical composition of products;
• the angle at which establishes the samples were exposed to the environment;
• time of the year in which testing is conducted;
• geographical location of the test.
The efficiency of microorganisms strongly depends on the chemical composition of the material. Polymers, which are well resist the action of moisture and are stable in different weather conditions tend to have high resistance against the microorganism, because on the surface of products made of such materials are not allocated plasticizing components, and does not create a breeding ground for microorganisms. Products that have the ability to partially flush with the surface of microorganisms, have certain advantages because microbes have a major impact is on the surface.
The angle at which the samples during the exposure target in relation to sunlight and atmospheric effects, in general, affects the efficiency and duration of microbial exposure. For some PEX plastics is characterized by a rapid release of additives play the role of the medium, if they are installed at an angle of 40 degrees to the south, than if they are placed vertically.
Time of year and geographical location tests also play an important role, because bacteria grow more active in warm and moist atmosphere than in the cold and dry climate.
In conclusion, we note that the test for resistance to bacteria and fungus must be conducted in two stages. First, you should perform short-term accelerated tests that will screen out materials that do not pose long-term interest. Secondly, the long-run full-scale tests, which are intended to confirm the results of laboratory evaluations.
