Which of the following is NOT a characteristic of safety glass?

Safety glass is specifically designed to reduce injury risk, commonly utilized in windows and doors, and is often required in hazardous locations due to its improved strength and shatter resistance.

The option identifying regular glass with no special treatment accurately represents a key characteristic that distinguishes safety glass from standard glass. Regular glass lacks the additional engineering and treatment processes that provide safety features, making it much more prone to breaking and causing injury when shattered.

In contrast, safety glass typically includes laminated glass and tempered glass, both of which are designed to enhance safety by either staying intact when shattered or breaking into dull pieces that minimize sharp edges, significantly reducing the likelihood of injury. Thus, identifying the lack of special treatment as a characteristic of standard glass confirms why it's essential to differentiate it from safety glass.