7972 zero expansion glass is a type of glass substrate that is used in various applications such as electronic devices and optical systems. This glass is known for its low coefficient of thermal expansion (CTE), which makes it ideal for use in high-precision applications that require stability and accuracy over a wide temperature range. The low CTE of 7972 zero expansion glass ensures that the substrate maintains its shape and dimensions, even when subjected to thermal changes, providing the accuracy and stability needed for high-precision applications. Additionally, the substrate is also highly durable and resistant to various environmental conditions, making it ideal for use in harsh environments. Overall, 7972 zero expansion glass is a versatile and reliable substrate material that is widely used in various industries and applications.