It is primarily used in the production of rigid polyurethane foams used for insulation of your home or refrigerator, and in many other areas. Some additional uses of MDI in polyurethanes include coatings, adhesives, sealants and elastomers in materials such as paints, adhesives and weatherproof materials. It is also used to make many kinds of footwear, sports and casual products, and to a lesser extent some special flexible foams.