This IEC Technical Report presents the important material properties for polymeric materials
used in outdoor insulation and, where applicable, lists the standardised test methods
including the minimum requirements. If no standardised tests are available, then test methods
reported in literature are summarised.
This report is valid for insulating materials used in outdoor high voltage electrical applications
with a system voltage greater than 1000 V a.c. having polymeric insulation including also such
applications where the housing is an integral part of the devices e.g. in surge arrestors and
cable terminations. The scope of this report is limited to the materials only. The performance
of insulators in service depends on several factors such as the type of material, the design,
environmental conditions etc. Consequently, the choice of materials that fulfil the requirements
listed below is a necessary condition but does not guarantee satisfactory performance
when used in outdoor insulation.