Solar Glass/Glass Laminate are used to seal the solar modules and must have properties like high solar energy transmittance, strength and durability, as well as additional functionalities like transparent conductive oxide coatings, anti-reflective coatings and sodium barrier layers. It is usually Tempered glass, also known as safety glass or toughened glass, is up to six times the strength of normal plate glass. Low iron glass is used as it provides a higher energy transmission.