Mechanical properties: Rigid PVC is a high-Young's Modulus construction material. Soft PVC, such as the material coin, has rubber-like properties. Thermal properties: Tg rigid PVC = 81 °C. Soft PVC has a Tg far below room temperature due to the plasticiser. Chemical resistance: Good resistance to UV radiation and sterilisation. Colour/surface Both rigid and soft PVC can be colourless and transparent with a shiny surface.