Icynene's 55 gal. Drum OC No-Mix Open-Cell PMDI Isocyanate Spray Foam Insulation, Side A supports the formation of a lightweight foam structure that expands into wall cavities, gaps, and hard-to-reach areas to help reduce unwanted air movement. When paired with the matching Side B resin component and installed according to manufacturer specifications, this two-component spray foam system helps create a continuous insulation layer that contributes to improved comfort and energy efficiency. Designed for professional installers, it is a key component for open-cell spray foam applications in modern construction and renovation projects.