June

by Kevin Kulbaba, Dana Adkinson, Greg Davidson and Sarah Elliott, Arlanxeo Butyl rubber (IIR) is formed from the cationically initiated

High temperature vulcanization (HTV) silicone rubber is the
polymer of choice with regard to housing material for high voltage
applications. The requirements are challenging due to harsh
environmental conditions like UV irradiation, humidity, industrial
pollution, etc. The tracking and erosion performance of the
compound needs to be evaluated to ensure the long term performance
of the high voltage insulator. Another key aspect to increase
the durability of the insulator is the resistance against nitric
acid, as this is formed by a combination of unavoidable corona
discharges in overhead power lines and atmospheric humidity.

CR silicone՚s unique properties allow it to be used in many niche ways. These unique properties include temperature stability, weatherability, compatibility and processing ease. Silicone has a very low starting durometer in its raw state. High levels of reinforcing filler are typically needed to obtain high durometer specifications. Additionally, physical properties of silicone are generally lower than most other elastomers. This can often cause difficulties in meeting tear, modulus, compression set or dynamic property application requirements. Application segments for silicone include automotive, wire and cable, architectural,
aerospace, consumer products and medical devices.