D638 Standard Test Method for Tensile Properties of Plastics

The ASTM D638 standard is a widely used test method for determining the tensile properties of plastic materials. This test method outlines the procedures for performing a uniaxial tensile test on plastic specimens to measure key mechanical properties such as tensile strength, elongation, and elastic modulus.

The standard provides specific details on the preparation of test specimens, including the preferred dimensions and recommended number of specimens to be tested. It also specifies the testing equipment and the testing conditions, such as the testing speed, temperature, and humidity, to ensure consistent and accurate results.

During the test, a plastic specimen is subjected to a controlled stretching force until it breaks. The test machine measures the applied force and the corresponding deformation of the specimen, allowing for the calculation of various tensile properties.

The ASTM D638 standard is valuable for characterizing the mechanical behavior of plastic materials and is used in various industries, including manufacturing, automotive, and aerospace. By conducting tensile tests according to this standard, engineers and scientists can evaluate the strength, ductility, and stiffness of plastic materials, aiding in material selection, product design, and quality control.