Icynene's 55 gal. Drum OC No-Mix Open-Cell Resin Spray Foam Insulation helps produce a lightweight insulation solution that supports improved building envelope performance by reducing unwanted air movement and enhancing energy efficiency. When properly combined with the matching Side A component and applied according to manufacturer recommendations, the system creates a continuous insulation layer suited for walls, ceilings, attics, and other areas requiring professional spray foam installation. This resin component is designed for qualified installers seeking consistent results from a complete open-cell spray polyurethane foam system.