ASTM D4918
Test Materials: ASTM D4918 specifies the use of smooth, flat test materials such as films, sheets, or other flat materials, typically made from plastic, paper, or textiles. The materials should be conditioned according to the standard’s requirements to ensure accurate and repeatable results.
Test Process: The test involves measuring the coefficient of friction (COF) between two surfaces using a standard testing machine. A weighted sled is pulled across the surface of the sample material, and the force required to maintain constant speed is measured, which helps calculate the COF.
Test Result Interpretation: The results are interpreted by analyzing the COF values obtained. A higher COF indicates greater friction, while a lower value suggests a smoother surface. These values help assess material suitability for various applications, such as packaging or product design.