UV irradiation

This study investigates the influence of low­temperature exposure (–18 °C) and ultraviolet (UV) irradiation on the mechanical properties of polymer films used in flexible packaging applications. The research focuses on widely used materials, including glossy and matte polypropylene (PP) and polyethylene terephthalate (PET) films of various thicknesses. Mechanical tensile tests were performed to evaluate the elasticity, tensile strength, and mechanical resistance of the films before and after exposure to cold and UV radiation.

Given rapidly increasing concerns about photodegradation of pharmaceuticals, we have applied accurate methods to quantitatively evaluate the drug photostability. The drugs studied were nifedrine, acetylsalicylic acid, acetaminophen, cetirizine, and pantoprazole. UV energy striking a target has been determined by using graphite. Runs were performed by placing each sample in a pan with a quartz lid and exposing it to ultraviolet (UV) light for periods of time ranging from 1 to 120 seconds. Percentage decomposition as a function of time has been determined for each pharmaceutical.