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Why are polyurethane foams used for upholstery and insulation?

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major industrial polymers Figure 1: The linear form of polyethylene, known as high-density polyethylene (HDPE).

Polyurethane foams are widely utilized for upholstery and insulation due to their versatile physical properties, which are achieved by trapping gas bubbles within a polymer matrix during manufacturing.12

Flexible Foams for Upholstery

Flexible polyurethane foams are created by reacting polyols with an excess of diisocyanates, such as TDI. During this process, water is added to react with terminal isocyanate groups, which releases carbon dioxide as a blowing agent. This gas becomes trapped as bubbles within the viscous polymer, resulting in a lightweight, resilient material ideal for:
* Upholstery and bedding1
* Automobile seats and crash panels1
* Carpet underlays and sponges1

Rigid Foams for Insulation

Rigid foams are produced using PMDI and polyether glycols, often with additional low-molecular-weight dialcohols to enhance structural rigidity. These foams form a network structure that provides excellent thermal properties, making them highly effective for:
* Insulation1
* Packaging1
* Marine flotation equipment1
* Lightweight structural elements2

The ability to control the density and rigidity of these polyurethane compounds allows them to be tailored for specific industrial and consumer applications.12