methyl methacrylate

noun

: a volatile flammable liquid C5H8O2 that polymerizes readily and is used especially as a monomer for resins

Examples of methyl methacrylate in a Sentence

Recent Examples on the Web
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Fourteen facilities in California used methyl methacrylate, or MMA, heavily enough to make it onto the Toxics Release Inventory list. Jason Henry, Oc Register, 30 May 2026 This may have led to a buildup of heat in a pressurized tank filled with 7,000 gallons of methyl methacrylate, a highly flammable liquid monomer used to manufacture plastics. Los Angeles Times, 29 May 2026 Made with oil-absorbing ingredients, including silica and methyl methacrylate cross polymer, the sunscreen also has humectants and emollients. Jenny Berg, InStyle, 29 May 2026 The tank, containing the toxic chemical methyl methacrylate used to make plastics and acrylic paints, threatened to explode as its internal temperature rapidly rose to about 100 degrees Fahrenheit. Zachary Folk, Forbes.com, 27 May 2026 The crisis at the 7,000-gallon tank of the toxic and flammable chemical methyl methacrylate at GKN Aerospace in Garden Grove, first detected Thursday, had prompted the evacuation of tens of thousands of people. Phil Helsel, NBC news, 27 May 2026 Authorities said roughly 50,000 people were ordered to evacuate in and around the Orange County city after a tank containing highly flammable methyl methacrylate (MMA) overheated and became compromised. Michael Sinkewicz, FOXNews.com, 27 May 2026 As the interior temperature of the tank increased, methyl methacrylate — which is used to make plastics — converted from liquid to gas, ramping up the pressure and risk of explosion, Whelton said. ABC News, 26 May 2026 Mitsubishi Chemical Group would be capable of annually producing 350,000 tons of methyl methacrylate, or MMA, a chemical component found in cement, adhesives, textiles and plastics. Prarthana Prakash, Fortune, 23 July 2024

Word History

First Known Use

1933, in the meaning defined above

Time Traveler
The first known use of methyl methacrylate was in 1933

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Cite this Entry

“Methyl methacrylate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/methyl%20methacrylate. Accessed 5 Jun. 2026.

Medical Definition

methyl methacrylate

noun
: a volatile flammable liquid ester C5H8O2 that polymerizes readily and is used especially as a monomer for acrylic resin

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