- InsulationHigh Density Urethane has been used commercially as exterior insulation starting with the Saturn S-II moon launch vehicle in 1964, and as exterior insulation on the Alaskan Pipeline in 1970 (still in service currently). In addition to being used as insulation for homes, RV’s, water heaters, refrigerators, and freezers; it is used for signage, tooling, model-making, boat building, and in many other applications. Urethane is very versatile and track proven. Redwood Signs stocks HDU panels that are 1-1/2″ thick and available in sheet sizes of 48” x 96” or smaller.
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