While many external factors must be considered when making insulation selections, Extol of Ohio Inc. has compiled key points into its “Manufacturer Insulation Data Comparison Chart.” Offered from the company’s website at www.extolohio.com, the chart identifies key characteristics of an insulation’s performance test results according to ASTM testing methods. The chart covers cellular glass, polyisocyanurate, extruded polystyrene (XPS) and phenolic insulations and is intended to help in the selection of insulation material for a given application.