PREPARATION OF LOW DENSITY SULFUR FOAM.
SOUTHWEST RESEARCH INST SAN ANTONIO TEX
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Work was directed to the development in the laboratory of low density, rigid sulfur foam having acceptable thermal and permeation characteristics and sufficient structural strength for use in construction applications in the cold regions. The study involved the selection and screening of various additives, as well as the development of a process, techniques, and procedures which when applied to sulfur in a molten state in a pressurized vessel permit the extrusion of a molten froth which on cooling solidifies to a rigid low density foam. The most important single achievement was the reduction in the density of sulfur foam from 25 lbcu ft to 10 lbcu ft, which constitutes an improvement in the expansion ratio based on elemental sulfur from 15 to 112, while, at the same time, maintaining a uniform material having essentially a closed cell structure. The low density sulfur foam has proved to have attractive stress-strain, thermal conductivity, moisture absorption, and permeability characteristics. By reducing the density, the unit volume cost of the foam has been significantly reduced, further adding to the economic attractiveness of this material.
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