Polyurethane Foam Softener Applications: Reducing Indentation Load Deflection (ILD/IFD) in Flexible PU Foam Grades 1. Introduction Flexible polyurethane (PU) foam is a versatile material widely used in applications such as furniture, bedding, automotive seating, packaging, and sound insulation. Its properties, including density, tensile strength, elongation, and indentation load deflection (ILD) or indentation force deflection (IFD),...