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 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.