21. In 1979, the first polyurethane foam version of the product was produced by Spirit Industries. 22. This two step reaction is used in what is commonly but improperly called polyurethane foams . 23. Those can be filled with fiberglass or expanding polyurethane foam sold in most hardware stores. 24. It is used as a catalyst for the formation of polyurethane foams and epoxy resins. 25. However, materials like polyurethane foam are susceptible to water absorption and performance degradation as well. 26. The space between the outer tank and the inner tank is isolated with polyurethane foam . 27. APP is also applied to flame retard polyurethane foams . 28. In 2007, lignin extracted from shrubby willow was successfully used to produce expanded polyurethane foam . 29. Mr Thomas had urged the government to ban all polyurethane foam and regulate its use. 30. Others, like polyurethane foams used in car interiors and shoes, are generally accepted as specialties.
