Key Takeaways WLK will cease operations at three chlorovinyl facilities and a styrene plant due to tough conditions.Seven other North American chlorovinyl sites will continue supplying PVC, VCM and chlor-alkali products.Westlake expects about $415M in pre-tax costs and a workforce reduction of roughly 295 employees.Westlake Corporation (WLK) announced it has approved a plan to cease operations at three of the North American chlorovinyl production facilities and the Styrene manufacturing unit amid challengin ...