UV radiation, as a natural part of solar radiation, affects almost all textile materials used in the production of technical textiles. UV radiation affects the material in the way of degradation and thus affects the strength of the basic building elements of materials - fibres or stripes - is lost.
The intensity of UV radiation is variable and is proportional to the intensity of solar radiation in different geographical areas. We measure the intensity of UV radiation in kLy (kilolangley), which expresses how much energy from UV radiation is received at one mm2 per year. See down: Generalized map of areas according to UV radiation intensity.
The material, which UV radiation has the greatest effect on, is polypropylene. This material, which is the basis of many industries, needs to be protected from the effects of UV radiation. This is done with the help of special additives called stabilizers. The stabilization of polypropylene against the effects of UV radiation is governed by the intensity of the radiation in individual areas.
If, for example, we have a polypropylene rope stabilized at 100 kLy, which corresponds to the conditions of Central Europe, it means that this rope must not lose more than 50% of its strength in one year. In order to avoid relatively large losses in strength (especially in safety applications), it is necessary to choose stabilization higher than the intensity of UV radiation in the particular area.
It is generally known that UV radiation has the least effect on polyester. However, by long-term measurement and testing of our products - ropes made of various materials - we have reached interesting results: the smallest losses in strength were found in ropes made of polypropylene multifilament fibre MULTITEX, which has been standardly stabilized at 80 - 100 kLy, for information see Effect of UV radiation on the strength of textile materials and half-life.
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