The hardest forms of plastic include plastic that has been mixed with other types of materials such as a very recent discovery by a team of Bangalore researchers where they strengthened ordinary plastic with nano-diamond (incredibly, tiny bits of diamond invisible to the naked eye), a sheet of layered carbon and tiny carbon cylinders. Also polycarbonates, which are commonly known by the trademark name Lexan, are a type of thermoplastic polymer, which, due to their durability, are widely used in bullet-resistant ‘glass’. The softest forms of plastic can be runny such as polymer clays, which are very malleable and can also include liquid forms.
