Clear acrylic tubes are scratch-resistant and have the clarity and brilliance of glass but are lighter and more durable. Also known as polymethyl methacrylate (PMMA), these tubes are made of a thermoplastic material that can be fabricated and thermoformed into different shapes. They have excellent strength, stiffness, and optical clarity, and bond well with both adhesives and solvents. Their weathering properties make them suitable for outdoor use. They are slow-burning and self-extinguishing and do not produce harmful smoke or gases in the presence of flames. These tubes are commonly used to create signs, displays, skylights, and conveyor shields.