Plastics and Chemical resistance

The chemical resistance of a substance is a complex property which depends (inter alia – amongst other items) on its chemical composition and on the way it has been processed / manufactured. The chemical resistance of a polymer pipe depends predominantly on its chemical structure, on additives, on its crystalline structure and on the condition of its surfaces. As chemical resistance depends, ultimately, on the possibility of chemical reactions occurring (reaction kinetics), the conditions under which they take place (pressure, temperature, radiation, mechanical loads, concentration of chemicals and the duration of contact with them, etc.) are also decisive. According to the existing standards (DIN 16888, Parts 1 and 2), there are three categories for a thermoplastic pipe’s behaviour under chemical attack: “resistant”, “conditionally resistant” and “not...