Caustic soda is an important base chemical, of which more than nine million tons are needed per year in Europe alone. From 2021, Westlake Vinnolit will offer certified climate-friendly caustic soda utilizing renewable energy Guarantees of Origin (GOs). The CO2 footprint of this low-carbon caustic soda from the Gendorf and Knapsack (Hürth) sites – which is introduced to the market under the brand name GreenVin® – is reduced by more than 30% compared to conventional Westlake Vinnolit caustic soda. The CO2 footprint taken as a basis was calculated by sustainable AG in accordance with the ISO 14067 standard. Review and certification are carried out by TÜV Rheinland.