Why the borosilicate glass used in sight glass must be tempered

When it comes to sight glass, the material used plays a crucial role in its performance and durability. Borosilicate glass is a popular choice due to its excellent thermal and chemical resistance. But why is it important for borosilicate glass in sight glass to be tempered?

Enhanced Strength

Tempering is a process that involves heating the glass to high temperatures and then rapidly cooling it. This process creates internal stresses in the glass, making it stronger than regular glass. In the case of sight glass, which is often exposed to high pressures and temperatures, tempered borosilicate glass is essential for withstanding these harsh conditions.

Improved Safety

Tempered borosilicate glass is designed to break into small, dull pieces when shattered, reducing the risk of injury compared to regular glass that breaks into sharp, jagged shards. This is especially important in industrial settings where sight glass is used in equipment that may be under high pressure.

Thermal Resistance

Borosilicate glass is known for its low coefficient of thermal expansion, making it resistant to thermal shock. When tempered, this thermal resistance is further enhanced, allowing the sight glass to withstand sudden changes in temperature without cracking or breaking. This is crucial for maintaining the integrity of the sight glass in various industrial processes.

Chemical Resistance

Tempering borosilicate glass also improves its chemical resistance, making it more resistant to corrosion from harsh chemicals. In industrial applications where sight glass is exposed to corrosive substances, tempered borosilicate glass ensures longevity and reliability of the equipment.

Overall, the process of tempering borosilicate glass used in sight glass is essential for enhancing its strength, safety, thermal resistance, and chemical resistance. By choosing tempered borosilicate glass for sight glass applications, industries can ensure the durability and performance of their equipment in demanding environments.