Wellman is a leading PET resin producer, setting the standard as a manufacturer and marketer of high-quality PermaClear? PET packaging resin. ? Our PET resin is used in the manufacture of plastic beverage bottles and other food packaging. Valued for its consistency and performance, PermaClear? PET resin produces clear bottles at the maximum throughput of stretch blow molding machines. Customers benefit by using these resin products and by partnering with our customer-responsive organization.