Icynene's 55 gal. Drum High-R 80 Open-Cell All-Season Resin Spray Foam Insulation, Side B helps produce an open-cell insulation system that expands to fill gaps, cracks, wall cavities, ceilings, and other difficult-to-reach spaces for improved air sealing and energy efficiency. When properly mixed with the matching Side A component and applied according to manufacturer recommendations, the resulting foam creates a continuous insulation layer that enhances indoor comfort and long-term building performance. Suitable for professional insulation contractors, this all-season resin component is an essential part of a reliable open-cell spray foam system.