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Samples of biaxially oriented polyethylene terephthalate irradiated in a nuclear reactor have been investigated at five temperature levels ranging from − 150°F to 350°F. In general, from tensile studies, the ultimate tensile strength was found to decrease markedly to a relatively low magnitude upon receiving a reactor irradiation dose having a thermal neutron bombardment component of 1018 nvt and over. The modulus of elasticity for both the irradiated and nonirradiated samples was found to increase with the decrease of the temperature. The fracture surfaces of the biaxially oriented polyethylene terephthalate samples obtained at − 15°F are also recorded for reference.

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