Compression, tension, and shear properties of plastic sandwich with foamed-in-place cores were determined at temperatures from 75° to 700°F. Cores were of Dow Corning silicone foam R-7002, with a den¬sity range of 12.6 to 17.5 pounds per cubic foot, and triallylcyanurate modified polyester reain (Laminac 4231) reacted with 2,4-toluene di-isocyanate, with a density range of 11.9 to 12.2 pounds per cubic foot. Also presented are data on the weight and dimensional stability of silicone and Laminac 4231 cores exposed to 100 percent relative humidity at 100° F. for 21 days. The strength tests show that Laminae 4231 cores are much stronger than silicone cores of the same density at tempera¬tures below 300° F. Above 300° F., the strength of Laminae 4231 cores approaches the strength of silicone cores. The weight and dimensional stability of silicone cores were not affected by exposure to high humidity. Laminae 4231 cores showed increases in both weight and dimension after the high-humidity exposure.
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