GacoOnePass 2 Lbs. Closed Cell Foam installs quickly in up to 5-1/2" passes which reduces labor costs by 50% or more and offers 20-30% higher yields than standard 2 Lbs. foams when sprayed in one pass at 3 to 5-1/2" thickness. GacoOnePass is approved for use in air barrier systems. GacoOnePass F1850 is a two component HFC - blown (zero ozone - depleting) liquid spray system that cures to a medium - density rigid cellular polyurethane insulation material. GacoOnePass F1850 contains polyols derived from naturally renewable oils, post-consumer recycled plastics, and pre-consumer recycled materials.