Polyurethane rigid foam is the insulating material which is most widely used throughout the world for refrigerators and freezers. The insulation efficiency of polyurethane foams is a key property for the low temperature preservation of food during processing, storage and distribution to the consumer. Without polyurethane insulated refrigeration, approximately 50% percent of the world’s food would rot, heavily influencing our daily life and food related business.
Polyurethanes are ideal for the insulation of refrigerating appliances and have major advantages as they are:
This means that ever more stringent energy standards can be met, with benefits to the consumer through lower energy bills and a reduction in energy used. As shown below, EU energy efficiency initiatives have resulted in considerable energy savings since 1990.
Even when using small amounts of the material, the low thermal conductivity of polyurethanes results in excellent insulation, leaving a large useful space for the consumer. In addition, polyurethane rigid foams have a long service life. Fridges can consume up to 30% of total household electricity, so energy efficiency makes a real difference. Because of the introduction of polyurethanes into refrigerators, models designated A++ today are 60% more efficient than refrigerators 15 years ago.
The graph below illustrates just how much energy has been saved in European households by the use of polyurethanes:
According to the EU Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC, "white goods" such as refrigerators and freezers are subject to recovery and recycling targets across Europe. Foam from the appliances can be extracted and either recycled or used as fuel, depending on national infrastructures, further helping to conserve natural resources.
Polyurethanes thus play a crucial role in the energy-efficient transportation and preservation of our food, ensuring that it reaches our tables fit for consumption. More information on the use of polyurethanes in the cold food chain.
Polyurethanes provide not only excellent insulation properties, but offer also outstanding design qualities. This is because the same material – polyurethane – can be used for both refrigerator housing and insulation. The only difference is the material's density. Polyurethanes used for refrigerators’ doors enable the manufacturers to produce both parts with just a solid, void-free surface. Polyurethanes prove especially valuable from a design perspective, because with just one application of a surface coating the finish is impeccable. No additional post-finishing is necessary.