Sioplas® was developed in 1968 by Midland Silicones (now Dow). In the first stage of this two-stage process, vinyl silane is grafted onto the polymer chain with peroxide activation. In the second stage, pipe is conventionally extruded from the grafted compound with a catalyst masterbatch. Cross-linking takes place offline in an aqueous or steam environment. Ever since this process was developed, Buss Co-Kneaders have been used in the first stage and for producing the catalyst masterbatch.
For cable insulation up to 10 kV, silane cross-linkable PE compounds have been globally proven as the most cost-effective materials and are produced in large quantities.