Insulfoam’s Platinum GPS (graphite polystyrene) insulation is made with BASF’s Neopor, a rigid foam that integrates high-purity graphite into the polymer matrix for R-values that increase as the outdoor temperature drops, the manufacturer says. The silver/gray color of the insulation offers similar performance to extruded polystyrene (XPS) insulation but is more affordable. Stable long-term R-values and increased vapor permeability make GPS a breathable insulation.
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