Casting resins for the manufacture of insulators

2-component epoxy resin
The epoxy resins for the manufacture of insulators are very highly filled with minerals, which results in high viscosity (viscous flow behaviour). Because of this requirement, the casting resins are preferably worked in a vacuum or with the pressure gelation process. A significant advantage of the pressure gelation process is that it equalizes the chemical volume shrinkage which takes place during curing.

Work is carried out at higher temperatures in order to achieve the required flow characteristics. The high fill material content is required for the moulding material to come as close as possible to the thermal expansion coefficient of metal. The casting resins can essentially be divided into three groups:

  • Cyclopalipatic epoxy resins - UV stable and self-restoring at electrical flash-over
  • Bispehnol A epoxy resins - standard
  • High-impact modified epoxy resins - inhibited crack propagation

Core sector of difficult electronic applications:

  • generators and motors
  • high voltage transducers
  • insulators and sockets
  • dry distribution transformers
  • control systems