General Insulation Companies fabricates Expanded Polystyrene (EPS) Insulation into custom shapes spanning across many industries. EPS provides a typical R value of 4.17 per inch (K factor = 0.24) at a mean temerature of 40ï‚° F. Unlike that of many other insulation products, the R value of EPS insulation is permanent due to the cellular structure containg only stabilized air. Aging has no effect upon the performance of EPS providing long-term solutions in the marketplace.