Single Component Spray Polyurethane Foam
This information reflects our best understanding of product composition in 2016.
Single component polyurethane spray foam comes in a range of products with different properties for different applications. This product is supplied in a can for either direct application with a straw or application with a special gun. The general...
Single component polyurethane spray foam comes in a range of products with different properties for different applications. This product is supplied in a can for either direct application with a straw or application with a special gun. The general composition includes one or more isocyante, polyol, catalyst, hydrocarbon propellant/blowing agent, surfactant, and flame retardant. Typically, the isocyanate portion (MDI and/or PMDI) is mixed with the polyol portion, including additives, and then reacts to some extent in the can. This creates a prepolymer which further reacts with moisture in the air when applied on site. While there are many types of single component spray foam, the composition is typically similar, with minor differences in percentage of components. This CP covers specifically a low pressure spray polyurethane foam intended to fill gaps around door and window frames to seal against air and sound infiltration. These foams are minimally expanding to avoid warping of the door or window frames.