Dural is a high strength, low weight alloy made from Aluminium, Copper and Magnesium. The mechanical properties are as good as, or better than, low-carbon steel although it has limited weldability and poor corrosion resistance. Also known as Duralumin, it was the first widely used deformable aluminium alloy. It can be spun, tempered, riveted, welded or machinated. It can carry heavy loads and is ductile. When copper is added to the alloy, its strength increases, but then it also makes it susceptible to corrosion. It is also reflective and impermeable. It is a very good conductor of heat and electricity. It is odourless, and reacts with the oxygen that is around, and forms aluminium oxide. Generally, Duralumin alloys are soft, ductile and workable when they are in normal state. They can be easily rolled, folded or forged. It has a high strength, which can be easily lost during wielding.