Which quadrant of the National Fire Protection Association (NFPA) 704 system identifies that a product is water reactive?

The correct choice is based on the color-coded system established by the National Fire Protection Association (NFPA) for identifying the hazards associated with materials. In the NFPA 704 system, the white quadrant specifically denotes specialized hazards. One of the notable designations within this quadrant is for water-reactive materials. When a product is classified as water reactive, it signifies that it can undergo chemical reactions that produces a hazardous situation when it comes in contact with water.

This specific category is essential for emergency responders to understand, as it indicates that efforts to extinguish fires involving these materials with water could exacerbate the situation rather than mitigate it. Therefore, recognizing that the white quadrant indicates the potential water reactivity of a substance reinforces the importance of using appropriate tactics and protective measures when approaching incidents involving such materials.