Limitations of test methods for resistance to microorganisms
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Data obtained as a result of accelerated tests for resistance to the growth rate of microorganisms, can provide results that lead to wrong conclusions, if these results are not subject to the correct discussion and misinterpreted. Limitations of this test method are as follows:
• a desire to implement the optimal conditions for the growth of microbiological objects requires the use of high level of toxic components, which in real terms would lead to excessive effect “overkills”;
• Exposure usually limited to a relatively small number of different types of microorganisms;
• Exposure is limited by temperature and time;
• incorrect interpretation of the data obtained by non-experts in this field.
It is also important to understand that some chemicals can be very toxic to microorganisms in the short-term accelerated tests, lasting 14-21 days, but their effectiveness may decline with long-term exposures. For example, fungicides may simply boil down to the hot atmosphere to collapse under the action of ultraviolet radiation, or washed out by rain or dew.
Full-scale tests to investigate the durability of PEX materials to bacteria and fungus and their limitations
The tests in the open air, conducted to evaluate the durability of PEX materials to the action of microorganisms, performed on a variety of techniques. The simplest test consists in the fact that the samples are simply placed in the open space in the geographical area that is most favorable for the growth of microbiological objects.
An alternative way of testing is called the method of burial in the soil. This method consists in the fact that the samples buried in the ground for four weeks, and then studied the results of the influence of microorganisms on the samples.
Tags: germs, microorganisms, PEX materials, test methods
