Aluminum's advantages stem from holding its integrity for longer. Aluminium license plates don’t yellow, crack, curl, warp, or break, and they won’t rust or corrode. Screen-printed aluminum auto tags will last a minimum of 5–7 years in terms of the non-fade ink life, and often longer. With aluminum it’s more the non-fade ink life that’s of concern, since the aluminum plate itself can last 10 years or more. http://www.richisticker.com/license-plates/aluminium-license-plates/