The HazMat Class that has the attribute "reacts with metals - liberates hydrogen" is Class 4 - Flammable Solids.
Class 4 - Flammable Solids includes substances that are capable of causing a fire through friction, absorption of moisture, or spontaneous chemical changes and remain ignited or create a self-sustained fire after ignition. Some flammable solids have the specific attribute of reacting with metals, which can lead to the liberation of hydrogen gas.
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Dangerous substances are substances that have the potential to cause harm to living organisms, including humans, animals, and plants, as well as the environment. These substances can pose various risks and hazards, leading to adverse health effects, damage to property, and environmental pollution. Dangerous substances may be toxic, flammable, explosive, corrosive, reactive, or harmful in other ways.
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The statement "Easily ignited and difficult to extinguish" is accurate for Class 4 flammable solids.
Class 4 materials are classified as flammable solids. They are substances that are capable of causing a fire through friction, absorption of moisture, or spontaneous chemical changes and remain ignited or create a self-sustained fire after ignition. Flammable solids can include substances such as matches, nitrocellulose, and certain metal powders.
