Icynene's 55 gal. Drum Ultra-50 Open-Cell PMDI Isocyanate Spray Foam Insulation, Side A supports the production of a lightweight open-cell insulation system that helps reduce air infiltration while contributing to improved comfort and energy efficiency. When combined with the matching resin component and installed according to manufacturer specifications, the finished foam expands to create a continuous insulation layer across walls, ceilings, attics, and other building areas. Designed for qualified spray foam installers, this Side A component is an essential part of a complete open-cell polyurethane foam solution.