It is important for design

selection and maintenance of composite insulators

studying aging characteristic of silicone rubber materials.In this paper

the shed samples of composite insulator getting natural aging in eight different exposure fields sitting all over the china were selected for studying the hydrophobicity characteristics of silicone rubber such as hydrophobicity transferring

losing and recovering property affected by aging.Moreover

the hydrophobicity of aging silicone rubber undergoing acidic and alkaline solution soak was studied in detail too.Result shows that aging effects the hydrophobicity of silicone rubber distinctly;upside of samples has worse hydrophobicity than underside because there lay different aging factors such as sunshine

rain wash

pollution accumulating

etc.during exposure course.