Stepan Company is a leading manufacturer of polyester polyols, specialty polyurethane foam systems and phthalic anhydride (P.A.). We marry our innovative STEPANPOL® polyol chemistry, vertically integrated supply chain and market leading technical service to meet the needs of our global customers.

Polyester Polyols

STEPANPOL polyester polyols find a wide range of utility in both polyurethane and polyisocyanurate applications. We offer a full range of aromatic and aliphatic polyester polyols for use in rigid foams, as well as many C.A.S.E. (coatings, adhesives, sealants and elastomers) applications. Stepan's comprehensive line of polyester polyols provides excellent insulation and mechanical properties while offering superior processability and applied economics. Our global network of ISO 9001:2015 registered manufacturing plants ensures that you receive material of the highest quality and consistency.

Powder Coating Resins

RUCOTE polyester resins are designed with either hydroxyl or carboxyl functionality and combine with various curatives to form durable, attractive, environmentally friendly powder coatings. With Stepan's RUCOTE resins, formulators can enhance the quality, performance, and esthetic of finishes on a wide variety of substrates. Stepan manufactures RUCOTE resins in its ISO 9001:2015 certified production facility in Columbus, GA.  

Phthalic Anhydride

Phthalic anhydride (P.A.) is an important part of Stepan’s Polymers division. In addition to being used in many of our polyester polyol chemistry, phthalic anhydride is a key raw material for plasticizers and unsaturated polyester resins. Stepan manufactures P.A. in its ISO 9001:2015 certified production site in Millsdale, Illinois.


Stepan’s polyester polyols, used in rigid foam insulation, offer impressive sustainability advantage, contributing to significant energy savings and reduced greenhouse gas emissions. Sales of Stepan’s polyester polyol in 2016 contributed to saving 97 million barrels of oil. Over a twenty-year period, covering the life-span of polyiso insulating boards, Stepan’s polyester polyols have contributed to 1 billion barrels of oil saved