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Abstract: In order to obtain the characterization of HNS under cook-off condition, the cook-off tests of 3 sizes of sealed HNS pellets, 3mm× 4mm, 4mm×5mm and 4mm×6mm, were carried out under 4 constant temperatures, 400°C, 350°C, 320°Cand 315°C. The reaction responses were determined by the damage or distortion of sample tubes and its vulnerable place. The results show that the reaction temperatures take on the decreasing trend with the increasing of charge weight under the same environment temperature. When the charge weights are the same, with the increasing of environment temperature, the reaction temperatures go down. [Copyright &y& Elsevier]