{"id":8897,"date":"2026-05-22T22:01:46","date_gmt":"2026-05-22T22:01:46","guid":{"rendered":"https:\/\/siliconvalleymovingpost.com\/?p=8897"},"modified":"2026-05-22T22:01:46","modified_gmt":"2026-05-22T22:01:46","slug":"what-is-methyl-methacrylate-the-substance-at-the-center-of-a-garden-grove-hazmat-crisis","status":"publish","type":"post","link":"https:\/\/siliconvalleymovingpost.com\/?p=8897","title":{"rendered":"What is methyl methacrylate, the substance at the center of a Garden Grove hazmat \u2018crisis\u2019?"},"content":{"rendered":"
\n

A vapor release of an industrial chemical at a Garden Grove aerospace plant triggered widespread evacuations on Friday, May 22, when fire authorities warned of the possibility of a spill or explosion of the thousands of gallons of chemical. The chemical is methyl methacrylate,\u00a0also known as MMA.<\/p>\n

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Craig Covey, incident commander from the Orange County Fire Authority described it as a \u201chighly toxic substance\u201d that can \u201cimpact the respiratory system, cause skin irritation and eye irritation.\u201d<\/p>\n

\u201cThe other concern we have is that it is extremely flammable in it\u2019s current state, very reactive and can cause an explosion, which is why we have that hard perimeter in place,\u201d he said.<\/p>\n

Garden Grove Police Chief Amir El-Farra said about 40,000 people were affected by the evacuation order, and about 15% of them were refusing to leave. He and other officials on the scene urged everyone to adhere to the orders, noting the dangers of the situation.<\/p>\n

In addition to its use as an ingredient in heat-resistant coatings in the aerospace industry, MMA has a long history as an ingredient in products used in nail salons, barber shops and similar settings. Since at least 2015 products using MMA have been banned at nail salons in California. The chemical also is listed in public warning signs required by Prop 65, the state law that calls for notification about potentially dangerous products used in public buildings.<\/p>\n

MMA is used in aerospace for some of the same reasons it was banned in nail salons \u2014 it bonds with other materials quickly and makes those materials harder.<\/p>\n

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\u201cThough MMA products have been banned from nail salons and barber shops in California since 2015, that hasn\u2019t prevented some manicurists and others from using them. As a result \u2014 and because their products aren\u2019t banned in every state \u2014 many salon product suppliers continue to manufacture coatings that include at least some MMA. Starting last month, nail coatings with MMA levels of 1,000 parts per million or higher according to a new rule by the California Department of Toxic Substances Control. Manufacturers have until June 1 to comply, according to the agency.\u201d<\/p>\n

In the short term, methyl methacrylate causes respiratory irritation, but little is known about the long-term effects of the substance on humans, Dr. Regina Chinsio-Kwong said at a press conference Friday.<\/p>\n

\n<\/div>\n

\u201cWhat we know in terms of human health is that we have very limited case reports of exposure and when you have limited short-term exposure, meaning maybe you inhaled some of the vapor, it can cause significant irritation in the lungs, the nasal passages and it can also cause nausea, it can also cause dizziness,\u201d she said. \u201cAt very high levels, it can really cause severe respiratory distress and hospitalization and this is where we really need everybody to heed all of the evacuation orders.\u201d<\/p>\n

Long-term consequences include effects on other organs, she said. Various animals have been affected differently, she said. Long-term human effects are not exactly known, but effects seen in mice could be seen in humans, she added. She is working with Environmental Protection Agency and the South Coast AQMD to provide more information.<\/p>\n

\u201cThis is a unique situation. We don\u2019t have information of a similar situation where this happened,\u201d she said.<\/p>\n

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A vapor release from a tank containing an industrial chemical used in plastics and manufacturing at an aerospace plant in Orange County triggered broad evacuations on Friday. <\/p>\n","protected":false},"author":1,"featured_media":8896,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36,2],"tags":[],"class_list":["post-8897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-based-on-facts-either-observed-and-verified-directly-by-the-reporter-or-reported-and-verified-from-knowledgeable-sources","category-news"],"yoast_head":"\nWhat is methyl methacrylate, the substance at the center of a Garden Grove hazmat \u2018crisis\u2019? - Silicon Valley Moving Post<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/siliconvalleymovingpost.com\/?p=8897\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is methyl methacrylate, the substance at the center of a Garden Grove hazmat \u2018crisis\u2019? 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