Refrigerators and freezers (appliances)

Consumer Goods and AppliancesPUR system with cyclopentanePUR system with HFOHigh-performance PUR systems with specific polyol

See also: Food and Beverage · Healthcare, Pharmaceutical and Medical

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What it is

What it is

Rigid PU foam in refrigerators and freezers is produced by injection between the internal plastic liner (HIPS or ABS) and the external metallic cabinet (pre-painted steel or aluminum). The system is injected in seconds, expands filling the entire space between the liners, and cures forming the foam that chemically bonds to both surfaces. This closed-mold process is radically different from continuous-line sandwich panel processes.

Rigid PU foam in refrigerators and freezers performs three integrated functions: thermal insulation (lambda determining energy efficiency), acoustic insulation (reducing internal compressor vibration noise), and structural (the foam together with the liners forms a rigid integrated structure — the appliance can be transported, moved and used without deforming). A frost-free refrigerator with PU foam properly specified consumes 40–60% less energy than a similar one with EPS or glass wool — difference translated directly into Procel label classification (A+++, A++, A+, A, B), the main visible differentiator to the consumer at the point of sale.

Modern appliances use density between 28 and 40 kg/m³, with closed-cell content above 92%, and aged lambda between 0.020 and 0.023 W/m·K for the best systems. The trend is for continuous reduction of foam thickness while maintaining or improving thermal performance — through more efficient blowing agents and optimized formulation.

Why it matters

Why it matters

The global refrigerator and freezer market moves tens of billions of dollars annually with concentrated competition among a few large players (Whirlpool, Electrolux, LG, Samsung, Haier, Midea, Panasonic, Bosch-Siemens). The differential in energy efficiency between competitors is, in developed markets, the main decision vector at the point of sale — consumers increasingly prefer A+++ products for the explicit operational savings on the electricity bill. In Brazil, mandatory Procel labeling and the migration to increasingly stringent classes put similar pressure, although the price differential still matters a lot.

Rigid PU foam is responsible for a significant portion of this efficiency differential. Moving a refrigerator from Class B to Class A+ requires improvements in insulation, compressor, and design — and the rigid PU foam is the most direct improvement vector. Annual savings of a customer of 10%+ on the electricity bill of the refrigerator is a commercial argument that strongly mobilizes manufacturer marketing.

From the supplier side, competition for supplying PU systems to appliance OEMs is brutal — high volumes, global qualification, very demanding technical requirements, and strong price pressure. Qualifying at Whirlpool, LG, Samsung, Electrolux is a multi-year process requiring local technical presence, specialized laboratories, global supply chain. Yet these contracts, once obtained, are of enormous volume and long-term horizon.

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