Acrylic acid, [waste] appears as a colorless liquid with a distinctive acrid odor. Combustible. Flash point 130°F. Boiling point 286°F. Freezing point 121°F. Corrosive to metals and tissue. May polymerize under prolonged exposure to fire or heat. If polymerization occurs in a container violent rupture may occur. Generally shipped with an inhibitor such as hydroquinone to prevent polymerization.