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A screen protector is an additional sheet of material—commonly polyurethane or glass—that can be attached to the screen of an electronic device and protect it against physical damage. Screen protectors are made of either plastics, such as polyethylene terephthalate (PET) or thermoplastic polyurethane (TPU), or of tempered glass similar to the original tablet or smartphone screens they are meant to protect. Window film is a thin laminate film that can be installed to the interior or exterior of glass surfaces in automobiles and boats and also to the interior or exterior of glass in homes and buildings. It is usually made from Polyethylene Terephthalate (PET), a thermoplastic polymer resin of the polyester family, due to its clarity, tensile strength, dimensional stability, and ability to accept a variety of surface-applied or embedded treatments. Window films are generically categorized by their construction components (dyed, pigmented, metallized, ceramic or Nano), by their intended use (automotive, marine or architectural), by substrate type (glass or polycarbonate), and/or by their technical performance (privacy, solar control, safety and security). Safety and security window films are polyester, or PET films that are applied to glass and glazing in order to hold them together if the glass is shattered (similar to laminated glass). The main difference between film and laminated glass is that these Shatter Safe films can be applied to the glass or glazing after manufacture or installation, i.e., it is a retrofit product. These films are used widely all over the world; they can be found on trains, buses, cars, and buildings.