Tempered glass is widely used as sight glass in industrial equipment due to its enhanced strength and safety features. Through a controlled heat-treatment process, tempered glass becomes several times stronger than standard glass, making it resistant to mechanical impacts and sudden temperature changes. However, despite these advantages, tempered sight glass is not completely free from risks—particularly the possibility of spontaneous breakage.

One of the main concerns with tempered glass is burst risk caused by internal stresses or impurities. Nickel sulfide inclusions, for example, can expand under certain conditions, triggering delayed breakage even without external force. In high-pressure or high-temperature environments, this risk may increase, raising safety concerns for operators who rely on clear and reliable observation windows.

To minimize such risks, manufacturers adopt preventive measures. Heat soak testing is often applied to tempered glass after production, where the glass is exposed to elevated temperatures to eliminate panels that might otherwise fail in service. Additionally, proper installation practices—such as ensuring correct gasket materials, avoiding excessive tightening, and preventing edge damage—greatly reduce the chance of unexpected breakage.

Protective measures can also be implemented at the user’s end. Installing safety shields or protective films over sight glass ensures that, in the rare event of breakage, fragments are contained and operator safety is maintained. Regular inspection for chips, scratches, or surface wear further enhances reliability.

In conclusion, tempered sight glass provides excellent safety benefits, especially in terms of impact resistance and fragment behavior. While the risk of spontaneous breakage cannot be entirely eliminated, careful manufacturing, testing, and protective practices significantly reduce potential hazards, ensuring safe and dependable operation in industrial environments.