Under the International Fire Code (IFC), N-Methyl-2-pyrrolidone (NMP) is not classified as a “Toxic” or “Highly Toxic” material. While NMP is legally classified as a toxic substance under environmental and labor laws (such as the EPA’s TSCA and OSHA’s Hazard Communication Standard) due to its health effects, the IFC uses a very specific, narrow definition of toxicity based on acute (short-term) lethal exposure.