Granules of fixed installation insulation are used to produce the first polymeric insulating layer in contact with the conductors. Consequently, this insulator is more exposed to heat and potential damage from high temperatures compared to other polymeric coatings in cables. These insulators, produced based on PVC and in compliance with International Electrotechnical Commission (IEC) standards, must possess specific mechanical and thermal properties. TSR Holding has the capability to manufacture granules suitable for various insulating sheaths with the highest quality and in different grades.