When it comes to 28mm CTC PET Preform, which is the most widely used in the beverage industry. This preform can also be used as part of complete production lines, allowing for the production of the bottle all the way through to the bottling of the drink or other food-grade liquid. 28mm CTC PET Preform is the material used to make the preform. It's usually made with an injection method that produces a mold that's then blown into a container for edible or non-edible liquids with a blow molding system.