Company Overview. Experience matters. Since 1948, T.O. Plastics has manufactured quality custom thermoformed parts and packaging and provided exceptional service to horticulture, medical and industrial customers around the world. One of the top 100 thermoforming companies in North America, T.O. Plastics delivers value by focusing on customer needs and by offering a full range of services from design-to-manufacture. At T.O. Plastics, we are dedica...