Antimony compounds are used as catalysts for polyethylene terephthalate (PET) production. Polyethylene terephthalate can be depolymerized to yield the constituent monomers. Polyethylene terephthalate, used to make plastic bottles for soft drinks, is prepared from ethylene glycol. The ester bonds in polyethylene terephthalate may be cleaved by hydrolysis, or by transesterification. Materials that are commonly used include polyethylene terephthalate or metals such as aluminum. Most disposable water bottles are made from petroleum derived polyethylene terephthalate (PET). The common PET bottles are made of a synthetic polymer, polyethylene terephthalate. Polybutylene adipate terephthalate (PBAT) is a biodegradable random copolymer. PET consists of polymerized units of the monomer ethylene terephthalate, with repeating (CHO) units. The holographic foil is manufactured using a mix of aluminum, polyethylene terephthalate (PET), and adhesives. One specialty application is the blowing of plastic bottles made of polyethylene terephthalate (PET). The glass bottle was replaced by a plastic (polyethylene terephthalate (PET) one. Both are made of the same material known as polyethylene terephthalate (PET). The starting compound is the also the starting monomer for polyethylene terephthalate. After purification, the monomers can be used to prepare new polyethylene terephthalate.