Development of Glass with Controlled Heat Resistance (Strain Point) & Softening Point

The strain point refers to the temperature at which internal stress in the glass can be relieved within a few hours without causing distortion, even when the glass is rapidly cooled. It corresponds to the temperature at which the viscosity of the glass reaches 10^14.5 dPa·s. Below this temperature, thermal stress is almost nonexistent, making it a critical benchmark for heat resistance.
Glass substrates have higher heat resistance than resins and are often used in high-temperature heat treatment processes. These substrates must not only withstand heat but also maintain minimal dimensional changes. For example, during the manufacturing process of display substrates, glass substrates are heat-treated at temperatures between 550°C and 600°C. Therefore, glass substrates with low thermal compaction due to structural relaxation, that is, the one with high dimensional stability are essential in this temperature range. By adjusting the glass composition, we have developed high strain point glass (OA-11, OA-20, OA-31) to enhance heat resistance for specific applications.
Additionally, our Super Heat-resistant Glass-ceramic: Neoceram, improves the heat resistance of the residual glass after crystallization. With exceptional heat resistance in the range of approximately 750°C to 850°C, it is used in applications such as glass-ceramics for cooking appliance top plates (StellaShine^TM) and fire-rated glass (FireLite).