What is the highest heat-resistant glass?
One of the most widely-used and versatile forms of heat-resistant glass is borosilicate glass, invented by Otto Schott in 1887. This revolutionary glass is formed by adding a high percentage of boron oxide to silicon oxide during the glass melting process. The result is a highly-connected network of molecules that enable the material to not only be exceptionally resistant to thermal shock and temperature fluctuations, but boast excellent mechanical properties, high transmission, and a choice of processing methods as well.
Borosilicate glass, e.g., DURAN® glass tubing, starts softening at temperatures above 525°C, making it an ideal and stable choice at temperatures lower than 500°C.
Advanced glass-ceramic materials based on specialty glass substrates, such as NEXTREMA®, are superior in regards to heat resistance and temperature shock resistance. NEXTREMA®, for example, can withstand temperature shocks of up to 820°C and offers operating temperatures up to 950°C.