This standard specifies a unified method for determining the compressive properties of plastics under standard conditions -1, serving as a fundamental basis for evaluating the mechanical behavior of materials under pressure. Its core principle involves applying compressive force to a specimen and measuring key performance parameters such as compressive strength, strain, and elastic modulus -2. This method typically employs a universal material testing machine -4-6, equipped with rigid compression platens to apply steady pressure, and utilizes extensometers (such as LVDT displacement sensors) -2 or video extensometers -8 to accurately measure minute deformations of the specimen. Applicable to rigid and semi-rigid thermoplastics and thermosetting plastics -2, this method provides essential data support for product design, quality control, and research and development -2-8.