ASTM D790 is a standard test method developed by the American Society for Testing and Materials to measure the flexural properties of plastics and other materials. This test evaluates how a material behaves under bending loads, providing important data on its strength and stiffness. The procedure involves applying a load to a specimen supported at both ends until it deforms or breaks. The results help manufacturers and engineers understand the material's performance in real-world applications, ensuring that products meet safety and quality standards.