Durability of PEX materials to mold
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This technique of accelerated laboratory tests designed to characterize the effect of mold on the properties of PEX materials. This method also allows to evaluate the effectiveness of antimicrobial additives introduced into the plastic.
Test procedure is that the suspension is prepared spores from cultures that are most active when exposed to polymers. This method, if necessary, may also be assessed the influence of many different organisms. Preparation of suspensions spores used as a control material to assess the rate of growth of mold in the absence of a polymer sample. As a sample for testing, it can be any shape and size, including finished products, bars or parts of finished products. To study the effect of mold on the optical transparency or reflection using optically transparent samples.
Tests carried out in a petri dish or other suitable glass vessel, Pa bottom of which is placed nutrient salt solution agar. Then, on the inner surface of a spray applied suspension spores contaminated the samples is covered with a lid and placed in an incubator, the temperature which is maintained at 28-30 ° C and the humidity is not less than 85%. Samples aged in such conditions for 21 days. After that, visually assess the growth of mold.
To investigate the effect of mold on the physical, optical and electrical properties of the material, samples are washed from the mold and air-condition in accordance with accepted standard methods. Physical tests carried out by conventional methods and their results are compared with the properties of the control samples.
Tags: mold, PEX, Physical tests, Polymers
