Development of a Stable High Expansion Water-Based Foam.
Final rept. 23 Sep 77-1 Dec 78,
MSA RESEARCH CORP EVANS CITY PA
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The objective of this program was the development of a long life water based surfactant foam capable of being generated at a 10001 expansion using a 5 concentrate. Half of the generated foam was to last for 24 hours at which time the foamed mass should be capable of conforming to the surface of an intruded object. In addition, foamed masses were to be capable of being built to a 10 foot height within a 30 foot diameter spread distance. In this study a long life foam formulation was developed largely on the basis of a comprehensive screening program. The developed formulation consisted of polyethyleneimine, glycerin, sorbitol, lithium chloride and MSA salt water foam agent. The developed recipe yielded foams which meet the design goals for life, expansion and concentration usage. As foams aged they dried to a closed cell but delicate structure. This loss of fluidity prevented the foam from conforming to an intruding object. Large scale field tests showed that aged foams were vulnerable to wind gusts and that spread distances of over 50 feet would be required to achieve foam heights of 10 feet. Author