What feature characterizes FR Class 2 clothing?

FR Class 2 clothing is specifically designed to provide protection from hazards associated with electrical arc flash and other fire-related risks. One of the essential characteristics of this type of clothing is its ability to self-extinguish and not melt when exposed to high temperatures or flames. This feature is crucial in protecting the wearer from burns and injuries in environments where there is a risk of such flash events.

Additionally, while lightweight materials can be beneficial for mobility, they are not a defining characteristic of FR Class 2 clothing. The waterproof property is advantageous in various working conditions, but it is not a requirement for fire-resistant garments. Cotton is a common material but does not inherently provide fire resistance unless treated, which is not unique to FR Class 2 clothing. Therefore, the main distinguishing feature that ensures safety in high-risk environments is the clothing's resistance to melting during a flash event.