Orange County firefighters rushed to an industrial tank leak at a facility in Garden Grove just before 3:40 p.m. Tuesday and evacuated nearby blocks after finding a chemical tank venting at the site.

The Orange County Fire Authority said the tank held methyl methacrylate, a flammable plastic epoxy that generates its own heat, and aerial footage showed firefighters using a high-powered hose to spray the tank as crews worked to keep it cool.

No one was injured, and firefighters said the chemical’s temperature had not risen. Crews evacuated the area east of Western Avenue, south of Orangewood Avenue, west of Beach Boulevard and north of Garden Grove Boulevard while they dealt with the leak at the 12000 block of Western Avenue.

The facility is operated by a company that develops plastic components for the aerospace industry, and firefighters said the building’s sprinkler safety system is designed to cool off the tank if it starts leaking. OCFA also said crews would provide additional water if needed.

It was not clear what caused the leak, but the response centered on one goal: keep the tank cool long enough to prevent the chemical from heating up on its own. That left the outcome dependent not on fire, but on temperature, and on whether crews could keep the tank stable until the leak was brought under control.