Wacker’s site in Burghausen, Germany

Wacker’s site in Burghausen, Germany

Wacker expands silicon capacities

One of the largest silicon manufacturers worldwide has strengthened its portfolio of specialties by expanding its production capacities for silicone rubber worldwide

March 2019

The Munich-based chemical group Wacker is increasing its global production capacities for silicone rubber. With expansion measures at several sites, Wacker plans to gradually raise its capacities by a total of 40,000 metric tonnes per year by 2021. Approximately €100 million ($113 million) has been earmarked for this capacity expansion. With these measures, Wacker is responding to the high demand for silicone rubber in key sectors such as the automotive, electronics and medical industries. These investments are part of the Wacker Silicones division’s strategy of further expanding its portfolio of specialties.

Silicone rubber is among the most sought-after elastomers in the industry. “Silicones are high-performance materials. They are essential for novel product solutions and belong to the innovation drivers in key industry sectors such as automotive, medical, and electronics,” said Robert Gnann, head of the Wacker Silicones business division.

“Above-average growth is being driven by the trends toward hybrid cars, electromobility and digitalisation, as well as decentralised alternative electricity generation using wind and solar power. So, we are making a major contribution to increased sustainability while pursuing our strategy of clearly focusing on boosting specialties in our portfolio,” he added.

With capacity expansions in the midstream production steps and downstream production, Wacker will significantly improve the silicone-rubber availability and related service for its customers in the near future. All solid silicone rubber product groups will benefit from these expansion measures. In April of last year, Wacker already brought a new production site for silicone sealants and thermally conductive silicone compounds on stream in Jincheon, South Korea. The production of room-temperature-vulcanising silicone elastomers and liquid silicone rubbers has also started in Amtala, India, where Wacker manufactures silicones in a joint venture with Metroark.

For 2019, the chemical group is planning further capacity enhance-ments for liquid silicone rubber, high- and room-temperature-vulcanising silicones and thermally conductive silicone compounds at its production sites in Burghausen (Germany), Adrian (Michigan, USA) and Zhangjiagang (China). Wacker is currently also evaluating the option of building a plant for solid silicone rubber at its US-based site in Charleston, Tennessee. Wacker has been producing polysilicon there since 2016. A plant for manufacturing pyrogenic silica, an important filler for high consistency silicone rubber (HCR), will come on stream at this site next year.



Silicone rubber consists essentially of silicone polymers and fillers. They are crosslinked with suitable reactants to produce three-dimensional structures that convert the fluid or ductile rubber compound into an elastic rubber. Silicone rubber is flexible at low temperatures and resistant to heat and aging (UV, ozone and radiation), is easy to process and has good mechanical properties that remain unchanged over a wide temperature range. Silicone elastomers are used in areas such as automotive and mechanical engineering, electronics and electrics, textiles, baby articles, toys, household appliances and sports articles, as well as in the construction industry. The Wacker silicone rubber portfolio comprises around 1,000 products.

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