The subject of the research is testing of the polyethylene foils (PE) degradation exposed in various environments. The foils serve to protect transporting flasks and containers to be possible their periodic application. The experimental foils were exposed in three various aggressive environments (coca-cola, chloride cleaner and detergent) with different pH. The time of exposition was 3 and 6 months. To study the changes of the PE foils properties, the rheological and tensile strength measurements were performed, as well as the microscopy of the surface. By the rheological measurements the changes of visco-elastic properties were determined. The rheological parameters (e.g. modulus of elasticity and viscosity, complex viscosity) react on the structural changes in the PE foils. The strength properties are also affected by the experimental environment. In this case the strength parameters were different in longitudinal and transversal directions.