Bisphenol A (BPA) is not added to polycarbonate plastic or epoxy resins, but is the intermediate which, through polymerisation, is transformed to these materials. After polymerisation BPA is firmly bound into the material. More than 99% of BPA is converted into polymers such as polycarbonate plastic and epoxy resins. Without BPA, one would not be able to produce polycarbonate or epoxy resin with their specific material characteristics.