Methods of testing PEX plastics: Microorganisms
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PEX materials in normal operating conditions, usually not too much exposed to microorganisms. However, low molecular weight additives such as plasticizers, lubricants, stabilizers, antioxidants, can migrate to the surface of the product that promotes the growth of microorganisms. The effect of material damage as a result of the impact of micro-organisms can be immediately found to reduce the material properties, changes in aseptic quality, loss of transparency and increasing fragility. The growth rate of microorganisms depends on factors such as heat, light and humidity. To suppress the growth and activity of microorganisms in PEX materials are added substance, known as fungicides or biosidy. Such additives are highly toxic in relation to lower organisms, but not affect the highly organized creatures.
The need for assessments of the effectiveness of various antimicrobial additives as at laboratory level and in real-life conditions in the open air led to the development of many different test methods. These methods and limitations associated with their use, as will be discussed in this chapter.
Tags: microorganisms, PEX
