NFPA 18A is a standard developed by the National Fire Protection Association that provides comprehensive guidelines for the use, testing, and approval of water additives used in fire suppression and vapor mitigation. These additives include foaming agents, wetting agents, and other chemical substances mixed with water to enhance its ability to control and extinguish fires.The standard ensures that any water additive used in firefighting operations meets strict performance, environmental, and safety criteria. It covers requirements for efficacy testing, storage, handling, and application methods to ensure consistent performance under various fire conditions. It also provides evaluation procedures for determining how well a water additive performs in specific fire scenarios, such as Class A or Class B fires.