Refrigerators and freezers (appliances)
See also: Food and Beverage · Healthcare, Pharmaceutical and Medical
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
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Market
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Value proposition
B2B sale between specialized global suppliers and appliance OEMs. Main arguments:
Energy efficiency as the leading driver:
- Improvement in Procel/Energy Star class: documented operational savings (10-15% on consumer electricity bill over appliance lifetime)
- Compliance with emerging regulations: EU 2019/2016 (Europe, effective 2021); DOE standards USA; PBE Edifica evolution — all pressure for systems that allow premium performance without significantly increasing cost
- Reduction of foam thickness with performance maintained: additional internal space without increasing product footprint — premium segment differentiator
Quality and process:
- Defect reduction in manufacturing: properly calibrated systems reduce defects (voids, delamination) by 30-50%, improving OEE (Overall Equipment Effectiveness) of the appliance line
- Integrated technical support: local presence of supplier engineering team reduces downtime and accelerates problem resolution — critical differentiator at OEMs
- Production line flexibility: some systems are optimized for quick changeover between sizes/models — relevant in plants with broad product mix
Strategic and long-term:
- Roadmap for HFO migration: suppliers with clear transition plan protect OEMs from future regulatory issues
- Traceability and compliance ESG: multinational OEMs with Scope 3 goals need suppliers with documented carbon footprint — premium capability of global suppliers over regional ones
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