Concentrate/90.0 Propellant 152a/10.0 Aerosol Hissing, Expanding & Collapsing Foam. This foam has a combination of the properties of both the expanding and collapsing foams. It discharges a liquid which immediately expands into a voluminous foam which is stable for only a few minutes and then collapses. An audible hissing noise is evident after the foam has been discharged which is due to the rapid coalescence of the gas bubbles in the foam and subsequent loss of propellant. The foam should be useful for cosmetic or pharmaceutical applications when it is desirable to discharge a liquid into a confined area where the foam can expand to achieve maximum contact and then collapse to minimize discomfort Lauric Acid/2.0 Water/48 "Tergitol XD"/2 Propellant 114/50 Triethanolamine/1.5 Water/96.5
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