Authorities are working to safely resolve a critical situation caused by a damaged chemical tank at a Southern California aerospace facility, leading to an evacuation order affecting thousands.

The tank at GKN Aerospace contains 6,000 to 7,000 gallons (22,713 to 26,498 liters) of methyl methacrylate, a chemical used in making plastic parts. It overheated last week, releasing vapors into the air around Garden Grove, Orange County. Officials warned of potential leaks or explosions if overheating continues.

Firefighters are cooling the tank with water to manage the heating chemicals. A crack over the weekend is helping relieve pressure, reducing explosion risk. Officials reported no active leaks or chemicals escaping.

There are no reports of injuries, but over 50,000 residents faced evacuation during Memorial Day weekend.

Why is Methyl Methacrylate Dangerous?

Methyl methacrylate is a hazardous chemical used in resins, plastics, and dentures. It can irritate lungs, eyes, and skin. In high doses, it affects lung function, causing dizziness and memory issues, as stated by the Environmental Protection Agency. Prolonged exposure can lead to respiratory problems or unconsciousness. Pollution tests show air quality remains normal in the evacuation zone.

Problems with the Tank

The tank’s drainage valves are not operational. Without intervention, there could be a chemical spill or explosion. Firefighters aim to keep the tank’s temperature below 85 degrees F (29.4 degrees C) to manage pressure.

EPA chief Lee Zeldin says a “low-volume release” is likely, allowing officials to monitor, neutralize, and contain threats.

Explosion Risks

If the temperature rises, pressure builds as methyl methacrylate turns from liquid to gas, risking an explosion and potentially igniting other tanks. An explosion could spread the chemical over a wider area, creating harmful vapors.

Dr. Regina Chinsio-Kwong from Orange County warns of inhalation hazards. Aerial photos show emptied streets, while evacuation shelters are available.

The evacuation zone is west of Anaheim, near Disneyland parks, which are not under evacuation orders. Chinsio-Kwong assured those outside the zone have no health concerns.

Next Steps

The crack in the tank possibly reduces explosion risks. Capt. Wayhowe Huang from Orange County Fire Authority observed that the tank isn’t releasing toxins into the atmosphere.

Fire officials are conducting “an all-night mission” to ensure pressure relief, minimizing explosion threats, stated TJ McGovern, interim chief. Zeldin remarked that controlled chemical release would alleviate tank pressure.

GKN Aerospace commits to collaborating with local agencies for a safe resolution.