Abstract: Creep tests on twelve groups of ethylene tetrafluoroethylene (ETFE) foil samples of 250μm thick were conducted at different temperatures and stresses. According to the test results, this paper employed the logarithmic fitting of time-deformation relations, and analyzed the parameter variations under different test conditions. The relationship between creep strain, stress and temperature was established and used to describe the creep properties of ETFE foils. It was found that a large creep strain existed at high temperature or large stress, and that the relationship between strain, stress and temperature was nonlinear. Moreover, the creep strain kept small if the temperature was under 40 ℃ and the stress was under 6MPa while large creep strain was observed at high temperature and stress.

Key words: ethylene tetrafluoroethylene (ETFE) foil, creep properties, temperature-stress effect