Dow High Performance Underlayment: The First Ozone-Safe XPS

The first extruded polystyrene (XPS) product for the U.S. insulation market with zero ozone-depletion potential was introduced late last year: High Performance Underlayment from Dow Chemical. Instead of the industry-standard HCFC-142b blowing agent, this XPS product is blown with HFC-152a, which contains no chlorine or bromine, the elements responsible for stratospheric ozone depletion.