What additional information is required on a chemical label besides the product identifier and signal word?

The choice of precautionary statements as an additional piece of information required on a chemical label, alongside the product identifier and signal word, is important for ensuring the safe handling of hazardous substances. Precautionary statements inform users about specific measures that should be taken to minimize risks associated with the chemical, including recommendations for safe handling, storage, and emergency response actions. These statements provide critical guidance to help prevent accidents and improve safety in environments where hazardous chemicals are used.

While other options such as SDS format requirements or contact information might be relevant in other contexts, they are not mandated elements that must appear directly on a chemical label. Similarly, a manufacturer's history does not contribute to the immediate safety or handling of the chemical at hand. Thus, precautionary statements are essential in communicating the necessary safety information to users effectively.