Factors affecting the lifetime of plastic –coated sheets Jozef Kmec 1 , Erika Fechová 2 , Stella Hrehová 3 jozef.kmec@unipo.sk 1 , efechova@gmail.com 2 , stella.hrehova@tuke.sk 3 1 University of Prešov in Prešov, Faculty of Humanities and Natural Sciences, Department of Physics, Mathematics and Techniques, Ul. 17 novembra č. 1, Prešov, 080 01, Slovakia 2 Technical University of Košice, Faculty of Manufacturing Technologies with a seat in Prešov, Department of Natural Sciences and Humanities, Bayerova 1, 080 01 Prešov, Slovakia 3 Technical University of Košice, Faculty of Manufacturing Technologies with a seat in Prešov, Department of Industrial Engineering and Informatics, Bayerova 1, 080 01 Prešov, Slovakia Abstract.The paper deals with factors obtained by corrosion test in a salt spray chamber at plastic-coated sheets, which are used in various areas of economy, e.g. automotive industry, construction etc. The goal of the experi- ment was to find out the relation between input parameters (Zn layer, Top+primer, Backoat) and output parameter. The experiment was planned with the use of full factorial design. Evaluation of experimental results was processed by means of Minitab 16 statistical software. Keywords:plastic-coated sheets, test in salt spray chamber, corroding time 1 Introduction In the area of technologies and utilization of construction materials the special emphasis is put on knowledge of mechanical, electric, chemical, but also magnetic properties of materials depending of their structure. Deterioration of materials by chemical or physical and chemical effects of environment is becoming more and more serious problem. Natural corrosion environments (atmosphere or water) are polluted by industrial activities and pollution causes that their aggression is rising. At the same time requirements for reliability and no-failure operation of materials are increasing, because disruption to their functions can have serious consequences in wide range of various areas of economy. To secure the longest possible durability life of products it is necessary to protect them from unwanted influences of envi- ronment, which become evident on the surface in the form of corrosion. Zinc coated sheets are long attested materials mainly at production of trapezoidal and corrugated sheets, folding roof covering, sheet covering of roofs, windows and last but not least in automotive industry. Undeniable advantage of zinc coated sheets is their low price. Big disadvantage is their low durability and currently low aesthetic value [1], MMS CONFERENCE 2017, November 22-24, Starý Smokovec, Slovakia Copyright © 2018 EAI DOI 10.4108/eai.22-11-2017.2274316