[en] This report summarizes the results of a combined experimental and analytical study to define the best wall insulation for TRUPACT applications from among commercially available polyurethane foam materials. Screening tests were conducted for eleven candidate foam materials to evaluate their basic performance characteristics. From these results, three materials were selected for further investigation via mockup wall-fire simulation tests. On the basis of these data, Sandia selected General Plastics' FR-9606 as the primary insulation material for TRUPACT prototype design. Both charring and noncharring analytical thermal models were developed for FR-9606 to support TRUPACT design analysis. 13 references, 77 figures, 14 tables