Table 2 Hydrophobicity of clean and polluted surface.

From: Study on material and mechanical characteristics of silicone rubber shed of field-aged 110 kV composite insulators

Specimen

Polluted surface/°

Clean surface/°

Difference/°

0a

118.87

118.87

0

10a middle

97.66

115.85

18.19

10a lower

102.68

116.92

14.24

20a middle

126.49

115.78

 − 10.71

20a lower

126.67

119.03

 − 7.64

26a middle

95.04

112.07

17.03

26a lower

99.31

115.54

16.23

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