What is Sandwich panel?
[[File:SIPs panel sample.PNG|thumb|A sandwich panel (schematic) with a wooden look]] [[File:Fachada vivienda.jpg|thumb|In housing, sandwich panels are often used]] [[File:Fachada biblioteca.jpg|thumb|The facade of this [[library]] looks prettier, because of sandwich panels.]] [[File:Sandwichpaneel-Dach07.jpg|thumb|Sandwich panels used as a [[roof]]. ]] A '''sandwich panel''' is a kind of [[composite material]], which is usually made of two components: A small outside layer (which is the same on both sides), and an inside layer, which is used to get certain properties, for example [[Insolation|insulation]] or [[fire resistance]]. [[Aluminium]] is often used for the outside part - the respective panels are also known as '''Aluminium Composite Panels'''. Sandwich panels are used in situations where high structural rigidity and low weight are required. They are also used for [[cladding]], eg. to add insulation, fire resistance, or simply to make a surface look more beautiful. [[Category:Building materials]]