The BYK Earth City location outside St. Louis (Missouri) serves as the North American center of excellence for the plastics business line. The former production facilities of PolyAd (Blending and Compaction) and Addcomp (Extrusion Compounding) are located on an area of approx. 12,635 square meters. Around 40 dedicated employees produce additives for thermoplastics, PVC and thermoset applications using state-of-the-art production facilities and the latest equipment in research and development. The Earth City site is certified to ISO 9001 and ISO 14001.