Which signal word is associated with Hazard Class I and chemicals that have severe corrosive properties?

The signal word associated with Hazard Class I and chemicals that have severe corrosive properties is "DANGER." This term indicates a high level of risk and indicates that the substance can cause significant harm or destruction upon exposure or contact. Chemicals classified under Hazard Class I are typically those that pose the greatest threats to human health and safety, which include severe corrosives that can cause irreversible damage to skin, eyes, and possibly respiratory systems. The use of "DANGER" serves as an urgent warning to ensure that users take necessary precautions and handle these hazardous substances with extreme care.

In contrast, the other signal words like "WARNING," "DANGER—POISON," and "CAUTION" denote varying levels of hazard—ranging from moderate to low risk—but do not convey the same immediate and serious implication as "DANGER." "WARNING" typically refers to moderate hazards, "DANGER—POISON" is used for acute toxicity but not necessarily corrosive properties, and "CAUTION" indicates a lower level of hazard. Understanding these distinctions helps ensure appropriate safety measures are taken when working with chemical substances.