The paper presents investigation of the properties of the surface and the material stiffness – flexibility of series of samples taken
from the sheds of the composite insulators. The insulators were previously subjected to wheel test. The wheel test and 1000 h salt
fog test are regarded as alternative examination of the material resistance to the effects of electrical surface discharges. There were
investigated two series of the samples of the composite insulators sheds. Examined specimens, made of HTV silicone rubber, were
taken from the sheds of medium-voltage composite insulators of two different manufacturers. Insulators of both types passed the
1000 h salt fog test without reservation. Meanwhile, the wheel test can provide a basis for better distinguishing between physical
properties of the tested materials. In the case of the insulators of one of the manufacturers the wheel test result was negative. Cross
puncture effect of the sheds took place in several places. In addition, sheds were covered with dark coating of varying thicknesses.
The results of the study indicated a significantly stronger influence of electrical and temperature factors on the sheds under investigations
during the wheel test than in the case of the 1000 h salt fog test. It can be stated that these tests cannot be considered as
alternative and it seems that wheel test enables better distinguishing between properties of the materials.
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