How can you determine if a pane of glass is tempered?

To determine if a pane of glass is tempered, looking for a small symbol etched into the glass is the most reliable method. Tempered glass undergoes a specific manufacturing process that strengthens it, and as part of this process, manufacturers typically etch recognizable symbols or markings onto the glass. These symbols often include a small "T" or other identifiers that confirm the glass has been tempered, providing assurance of its enhanced safety and strength characteristics.

In contrast, factors such as thickness, weight, or heat resistance may not provide definitive evidence of whether glass is tempered. Thickness can vary widely among different glass types, and weight alone doesn't indicate whether the glass has been heat-treated. Similarly, while tempered glass does have improved heat resistance, testing for heat resistance is not a practical method for confirming whether a particular pane is tempered, as it would require specific conditions and procedures that may not be readily available.