Abstract: Alcohol-resistant aqueous film forming foam extinguishing agent is widely used and is one of the important technical means to deal with all kinds of polar and non-polar liquid fires. However, because it contains xanthan gum and other components, the viscosity of the foam concentrates is relatively large, and there are certain limitations. Therefore, the basic formula of low-viscosity alcohol resistant aqueous film forming foam extinguishing agent was formulated in this paper, and the spreading performance of the foam was studied, which provided theoretical guidance for the subsequent research and development of low-viscosity alcohol-resistant aqueous film forming foam extinguishing agent products. The results show that the foam produced by the basic formula developed in this paper has better spreading performance on the surface of polar liquid than the traditional alcohol-resistant foam, and the foam spreading performance is the best when the mass fraction of fluoropolymer in the low-viscosity alcohol-resistant foam is 6%~8%. The spreading speed of low-viscosity alcohol-resistant foam on the surface of non-polar liquid is slightly faster than that of traditional alcohol-resistant foam, which is mainly related to the foam drainage time.

Key words: alcohol-resistant foam, foam extinguishing agent, spreading property, viscosity