Below is a list of Plastic Blow Molding manufacturers from Ontario, California. Plastic blow molding is the process of using compressed air and molten plastic in the form of a parison to create hollow, thin-walled containers and products. Blow molded plastic products are used in a wide variety of industries such as consumer, automotive, beverage and more. The malleable properties of plastic, combined with the versatility of the plastic blow molding process ensure the usefulness of this process to many manufacturers.