GreenSeal 2.8 HFO is a sprayed-in-place, nominal 60 psi compressive strength,rigid, HFO-blown, closed-cell spray polyurethane foam (SPF) roofing system. This two-component SPF consists of GreenSeal B Component resin and GreenSeal A Component. GreenSeal 2.8 HFO provides an R-value of 6.7 per inch and a continuous insulation without thermal breaks. GreenSeal 2.8 HFO SPF roofing systems provide excellent wind uplift resistance, are self- flashing and seamless, and the closed-cell nature provides a durable, leak-resistant roofing system.