Polyurethane Catalyst PC-5 in One-Component Foam (OCF) Sealant Cartridges: Properties, Applications, and Formulation Considerations Introduction One-component foam (OCF) sealants, commonly known as expanding foams, are widely used in construction and DIY applications for filling gaps, insulating spaces, and providing structural support. These foams are typically based on polyurethane (PU) chemistry and cure upon exposure to...