At what temperature can substances inside a pressure fire extinguisher start to become dangerous?

The correct answer indicates that substances within a pressure fire extinguisher can begin to become dangerous at temperatures above 120°F. This is due to the potential for the pressure inside the extinguisher to increase significantly when exposed to higher temperatures. As the temperature rises, the gas or liquid inside the extinguisher expands, which can lead to increased pressure levels that may compromise the structural integrity of the extinguisher canister.

At temperatures over 120°F, particularly in enclosed environments or direct exposure to heat sources, there is a risk of the extinguisher bursting or malfunctioning, potentially leading to hazardous situations. This is critical for safety during storage and operation of fire extinguishers, emphasizing the need for maintaining them in cooler environments to prevent such risks.

The other temperature ranges mentioned do not represent the threshold at which significant risks begin to manifest in pressure fire extinguishers. For instance, below freezing, substances within the extinguisher may simply become less effective but do not inherently pose the same danger as high temperatures. Above 200°F is a point where the risks magnify, but the actual dangerous threshold is indicated at the earlier temperature of above 120°F. Room temperature does not present sufficient risk to the functioning of the extinguis