Which concentrate is described as being based on hydrocarbon surface active agents and listed as a wetting agent, foaming agent, or both?

Which concentrate is described as being based on hydrocarbon surface active agents and listed as a wetting agent, foaming agent, or both?

• A. Other synthetic foam concentrate
• B. Aqueous film-forming foam concentrate
• C. Film-forming fluoroprotein foam concentrate
• D. Protein foam concentrate

Answer: (A)

The concept being tested is the chemical basis of different foam concentrates and how they are categorized by NFPA. Among foam concentrates, the ones described as being based on hydrocarbon surface-active agents are the nonfluorinated “other synthetic foam concentrates.” These rely on hydrocarbon (non-fluorinated) surfactants and can be listed as a wetting agent, a foaming agent, or both, depending on how the concentrate is formulated. This makes them distinct from protein or fluoroprotein concentrates and from film-forming fluorinated foams, which use protein or fluorinated surfactants rather than hydrocarbon surfactants. So, the correct choice identifies the hydrocarbon-surfactant category that NFPA lists as capable of serving as either a wetting or foaming agent.

The concept being tested is the chemical basis of different foam concentrates and how they are categorized by NFPA. Among foam concentrates, the ones described as being based on hydrocarbon surface-active agents are the nonfluorinated “other synthetic foam concentrates.” These rely on hydrocarbon (non-fluorinated) surfactants and can be listed as a wetting agent, a foaming agent, or both, depending on how the concentrate is formulated. This makes them distinct from protein or fluoroprotein concentrates and from film-forming fluorinated foams, which use protein or fluorinated surfactants rather than hydrocarbon surfactants. So, the correct choice identifies the hydrocarbon-surfactant category that NFPA lists as capable of serving as either a wetting or foaming agent.