The foam produced by the common foam fire extinguisher tends to be etched& dissolved
And thus fails to form effective water layer film for covering fire source.
As a result, tempering often happens

American ul& fm experiment has proved that mini foam fire extinguisher can form solidifying polymer layer on the surface when applying water-soluble solvent.
This thin layer can prevent foam& water layer film from the destruction by polar solvent. Moreover, mini foam fire extinguisher has regenerating function and can form more new polymers---water layer film. Hence, the effect of tempering-prevention can be reached.