This standard describes a specific method for determining the penetration temperature of thermoplastics using thermomechanical analysis (TMA). The penetration temperature is a key parameter for characterizing the softening behavior of materials, which helps to understand their performance under different thermal conditions. The core specialized instrument for this test is the thermomechanical analyzer (TMA). By applying a constant load on a specific-shaped quartz penetration probe (typically conical) and measuring the change in the depth of the probe's penetration into the material under programmed heating, the temperature-deformation curve is obtained, and the penetration temperature is determined. The standard provides normative guidance on sample preparation, instrument conditions, and procedures for the test.