When working with PMMA diffuser sheets it’s important to remember that plastics don’t stay the same size under all conditions. They expand in heat and contract in cold. This natural behavior, known as thermal expansion, can affect the final dimensions and fit of your sheets in lighting, display, or architectural applications. To make planning easier, we’ve created a simple Thermal Expansion Calculator that helps you predict how your sheet size will change with temperature, ensuring accurate installations and reducing errors.