Quartz glass tubes are widely used in chemical, mechanical, optical, and other fields, especially for the cases of high temperature. However, scarcity of evaluation techniques of elastic modulus at high temperature causes a barrier for analysis of thermal stress and structure design. Although a split ring method has been used at room temperature, its application at high temperature is scarcely reported due to the difficulty of the deformation measurement. In this study, a combination of the

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... t ring method and relative method was utilized to solve deformation measurement problem, thus evaluating the elastic modulus of quartz glass tubes at various temperatures. The results indicate that the elastic modulus datum increases from room temperature to 800℃, reaches the peak value of 87.20 GPa at 800℃, and then gradually decreases, and then sharply decreases when temperature higher than 1100℃. These results demonstrate that the quartz glass tube measurement by improved split ring method for determining high-temperature elastic modulus is accurate and reliable, which could be used to evaluate other brittle tubes at high temperature.