AbstractA new apparatus for measuring various properties of plastics is proposed. Using a split circular ring‐type specimen (C specimen), displacementL, tensionP, and fringe orderNare measured by means of a differential transformer, a load cell, and a polarizeranalyzer. The Young's modulus and photoelastic sensitivity of samples can be estimated fromL,P, andN. Experiments are carried out in the environments of air, water, oils, and chemical reagents under‐temperature controlled conditions. Typical data are, presented showing the applications of this apparatus to the determination of the heat distortion temperature and the effect of temperature on the rigidity and photoelastic properties, to the simultaneous measurement of stress relaxation and birefringence and of creep and birefringence, and to the continuous measurement of resistance to chemical reagents and ultraviolet r
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