Ultra Low Expansion Glass - Processing

Processing

The way that ULE is made is very different to the standard way that glass is made. Instead of mixing powdered materials together into a batch melting that batch and pouring out sheets of glass, ULE, being such a high temperature glass, has to be made in a flame hydrolysis process. In this process high purity precursors are injected into the flames, which causes them to react and form TiO₂ and SiO₂. The TiO₂ and SiO₂ then fall down and are deposited onto the growing glass.