Astm D61821 Pdf //top\\ -

Key parameters specified in the standard include heating rate, frequency, strain amplitude, and specimen geometry (e.g., rectangular or cantilever). The resulting thermograms are used to identify glass transition temperature (Tg), secondary relaxations, and the onset of flow or degradation. ASTM D6182-21 emphasizes the importance of calibration, thermal history removal, and data reporting to ensure reproducibility across laboratories.