Abstract: The classification of fire hazard for solid storage in current fire protection codes mainly refers to the Regulations on the transport of dangerous goods and the List of dangerous goods issued in 1971. Fire hazards corresponding to Class I and Class II dangerous substances in this list are categorized as Class A and Class B, respectively. In 2005, List of dangerous goods issued by the transportation authorities was formally abolished, along with the classification method for Class I and Class II substances. However, the core basis for fire hazard classification in GB 50016—2006 Code for fire protection design of buildings has not been revised accordingly. According to the standard GB 30000.15—2013 Rules for classification and labelling of chemicals-Part 15: Oxidizing solids, common solid nitrates such as potassium nitrate and sodium nitrate fall under oxidizing solid category 3. Nevertheless, the GB 50160—2008, 2018 Edition Fire prevention standard for petrochemical enterprises design still refers to the GBJ 16—87 Code for fire protection design of buildings and classifies them as Class A. This study introduces the GB 30000.15 standard and the current Classification information table of hazardous chemicals as new reference bases for the fire hazard classification of common solid nitrates, establishing a correspondence between the oxidizing category of nitrates and the fire hazard classification.

Key words: solid nitrates, fire hazard, oxidizing property, standard evolution； hazard classification