DuPont™ Thermax™ (ci) Exterior Foam Insulation is a rigid board insulation consisting of a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 1.25 mil embossed BLUE™ thermoset-coated aluminum on one side and 0.9 mil smooth, reflective aluminum on the other. Designed for continuous insulation, Thermax™ (ci)’s foam core is homogenous – featuring finer cell size and better cell orientation, reducing wormholes and knit lines – resulting in one of the highest R-values available (R-6.5 at 1”) for immediate insulation and weather protection on the job site, as well as long-term thermal performance.