What is required under the GHS format regarding hazard classification of chemical mixtures?

The correct answer emphasizes that specific criteria for classification are required under the Globally Harmonized System (GHS) for chemical mixtures. This is crucial because it ensures that each mixture is evaluated based on established guidelines that take into account the properties of individual components as well as their interactions. Using these specific criteria provides a systematic approach to determine the overall hazard classification of the mixture, which helps ensure worker safety by accurately conveying risks associated with the chemical.

In the GHS framework, mixtures must be classified according to their components’ hazard classifications and concentrations, along with other relevant information. This structured classification process aids manufacturers and users in effectively communicating hazards through proper labeling, safety data sheets, and other documentation that adheres to the GHS format.

The other options are not accurate as they do not reflect the GHS requirements. For example, stating that mixtures are no longer classified undermines the purpose of hazard communication. Additionally, saying that only general rules apply diminishes the need for precise criteria that can vary based on the nature of the chemicals involved. Lastly, indicating that labeling is optional contradicts the GHS mandate for consistent labeling practices to convey hazard information.