Which type of fire extinguishant is known for leaving no residue upon evaporation?

Clean agents are specially formulated fire extinguishing substances that do not leave any residual material upon evaporation. These agents typically include gases or vapors that rapidly quench a fire without the need for water or other physical substances that could leave behind residues. This quality makes them particularly useful in environments where sensitive equipment, such as in data centers or museums, is present, as there is no risk of damage from residue left behind after an extinguishing event.

In contrast, water, foam, and dry chemical agents all leave some form of residue. Water can cause damage due to moisture, foam can create a sticky mess, and dry chemical powders can require thorough cleanup after use, especially since they can corrode or damage electronic equipment if left behind. Therefore, clean agents are preferred for situations where cleanliness and the integrity of the site are paramount.