Shop for Impact Modified Acrylic sheets. Impact modified acrylic sheet is exceptionally tough compared to window glass making it an excellent choice for displays, skylights, and signage. Impact modified acrylic is an economical alternative to polycarbonate with advantages of weatherability and thermoforming capabilities. Stocked materials typically ship in 2-5 business days. Can’t find what you need? Get a quote or learn more about acrylic.