Polyester Polyols: Rigid Foam


Stepan is the global leader in the production and sale of aromatic polyester polyols for use in rigid polyisocyanurate and polyurethane foams. With four world class manufacturing sites on three continents, our globally integrated supply chain allows us to deliver the highest quality products worldwide.

Many of our aromatic esters are based on phthalic anhydride (P.A.) and proprietary Stepan technology. They impart excellent insulation and mechanical properties in rigid polyisocyanurate and polyurethane foams. Many of Stepan’s polyols are further modified to improve the flammability perfomance, strength and processing of rigid foams. These innovative products allow Stepan to provide exceptional value in customer end-use applications.

Common Uses and Applications

Polyisocyanurate boardstock insulation

Polyisocyanurate foams made with STEPANPOL® polyester polyols deliver superior insulating performance, applied economics and reliability. Through a combination of proprietary technology, application expertise and world class manufacturing practices, STEPANPOL® polyester polyols are the leading choice for PIR foam insulation in commercial roof and wall construction.

Spray insulation

Our unique chemistry leads to superior insulation and fire resistance, which are critical requirements in the construction industry. Formulations containing STEPANPOL® polyols are also easier to process due to low polyol viscosity and improved blowing agent solubility.

Appliance insulation

Our unique chemistry flows through complicated profiles, ensuring optimal fills throughout the appliance. STEPANPOL® polyols also produce foams with finer cell structures, leading to improved insulation value, which enables manufacturers to exceed energy requirements.  

Other common applications include bunstock insulation, pour-in-place insulation and pipe insulation.

See all STEPANPOL® polyester polyols for rigid polyisocyanurate and polyurethane foams.