Ethyl methacrylate Ethyl methacrylate (EMA): A type of acrylic powder that is often used in nail enhancements. Related Articles: EMA Odor Detection Level: Protecting Your Salon Business from ComplaintsBusting the Acrylic Nail Powder Myth: The Truth You Need to KnowLost Nail PlatesGlossary: Methyl Methacrylate (MMA)Unlocking the Secrets of Acrylic (liquid and powder) Nails