If a polyurethane is adequately formulated and applied for the operating conditions, hardness and other mechanical properties will be stable and will not affect performance. For this, roll covers made from polyurethane have always offered many advantages. They are now significantly upgraded with polyurethane elastomers integrating the ETERNATHANE® polycarbonate-based prepolymers technology: they are very resistant to friction & heat, as well as solvents and hydrolysis.