In GB/T 5470-2008 in plastic brittle temperature impact test method can know, plastic is needed in a variety of utility under the condition of bear or withstand the impact of low temperature bending.Processing orientation, thermal history, when the wire and cable costs when the force imposed on the material, especially the speed force will affect the brittleness of polymers.When an application of deformation conditions similar to the conditions specified in the test method, the brittle temperature can be used to predict the plastic material behavior at low temperature.Brittle transition temperature test for measuring the polymer lost toughness "glassy" temperature.
Cable temperature and the minimum installation of PVC Flexible Cables material of low temperature brittle temperature relationship must be inseparable.But how do corresponding relationship, have yet to have authority report.Generally higher than the brittle temperature 5 ℃, the impact test specimen is zero risk of open crack.Theoretically, if the impact of the installation when laying at this moment, less than under the condition of test impact can be construction.But here involves a variety of cable type and construction specification and the practical testing data of supporting.