Spray Polyurethane Foam (SPF)

Last updated: January 27, 2020

What Does Spray Polyurethane Foam (SPF) Mean?

Spray polyurethane foam (SPF) is a spray-applied chemical product used primarily as insulation. It is essentially a cellular plastic material that is created by mixing isocyanate and polyol resin. These two liquid components are combined in a spray nozzle and then applied to various surfaces. Once the mixture contacts the surface they react to form a solidified foam matrix.

The foam’s low thermal conductivity value makes it a popular insulating choice for lowering heating and cooling costs in buildings.


Corrosionpedia Explains Spray Polyurethane Foam (SPF)

While spray polyurethane foam is primarily used for thermal insulation, it also functions as an air, water/moisture and acoustic barrier. When the liquid mixture (isocyanate and polyol resin) exits the spray nozzle, they react on the surface of the objects and expand up to 30 to 60 times their original liquid volume.

When properly installed, this material forms a continuous barrier around walls, pipes and other contoured surfaces. The foam’s expansion property also makes it ideal for sealing narrow areas such as cracks, seams and joints.


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