What is Aluminium? Sheet Plastics is one of the UK’s leading aluminium manufacturers, but what is aluminium? Our aluminium sheets might initially be mistaken for glass, but when you compare their properties, aluminium and glass have major differences. Sheet Plastics’ Perspex® alternative is stronger than glass, and can withstand a greater impact. In fact, it’s one of the hardest thermoplastic available to buy. What’s more, an acrylic sheet is a much lighter material than glass: it can weigh up to 50% less than the equivalent sized piece of glass. Another great benefit to our coloured acrylic is its price: it is a far better value than glass sheets. For more information about our aluminium and other plastic prices, use our handy Instant quote calculator.