Sustainable Aerogel Blankets from Recycled Plastics and Construction Waste

Product · Building Envelope

Product · InnDex 18 · Evidence provided · High specification risk

Aerogel insulation blankets made from recycled PET and construction waste via ambient-pressure drying.

Converts two waste streams—PET bottle fibres and construction demolition debris—into ultra-low-density aerogel insulation blankets using ambient-pressure drying instead of supercritical equipment. Addresses both thermal envelope performance (reported 0.053 W/m·K) and circular economy goals in building insulation. Process eliminates capital-intensive drying infrastructure, reducing manufacturing cost barriers.

This material converts two familiar waste streams — PET plastic bottles and construction and demolition debris — into aerogel insulation blankets using ambient-pressure drying rather than the supercritical CO₂ equipment that makes conventional aerogel manufacturing capital-intensive. The reported thermal conductivity of 0.053 W/m·K is competitive with commercial aerogels and significantly better than standard foam, and the ultra-low bulk density (~0.04 g/cc) makes it viable for retrofit applications where structural load is a constraint. One piece of provided evidence supports the thermal performance claim at lab scale, which is a modest but real step above pure assertion. The critical gap is fire. Aerogel from mixed waste feedstocks has not been fire-tested, and without classified fire performance data there is no credible path to building code compliance in any jurisdiction. Mechanical property data — compression, tensile, vapour permeability — is equally absent, and recycled feedstock variability introduces a reproducibility risk that commercial aerogel manufacturers with controlled raw material supply do not face. The process chemistry is innovative and the circular economy framing is genuine, but a specifier should not progress this product until fire certification and independent durability testing exist; everything before that is research.

Strengths

• Diverts two major waste streams (PET and C&D debris) from landfill into high-performance insulation
• Ambient-pressure drying eliminates supercritical CO₂ and expensive autoclave equipment, lowering capex and process energy
• Reported thermal conductivity (0.053 W/m·K) competitive with commercial aerogel and superior to conventional foam
• Ultra-low bulk density (~0.04 g/cc) reduces structural load and enables retrofit applications

Considerations

• Lab-scale only; no disclosure of manufacturing consistency, batch variability, or quality control protocols at scale (high)
• No mechanical property data (compression strength, tensile, water vapour permeability, fire rating) essential for building code compliance (critical)
• Recycled waste feedstock variability (PET fibre diameter, C&D composition) may limit reproducibility and performance uniformity (moderate)

Risks

• No independent cost verification; cost per m² and installed cost vs. conventional/commercial aerogel remain unknown (high)
• No pilot or field trial data; thermal durability, moisture stability, and long-term performance unvalidated in real building conditions (critical)
• Fire performance not tested; aerogel from mixed waste may not meet building safety standards (reaction to fire, smoke) (critical)
• Ambient-pressure drying may extend cycle time or compromise density/porosity uniformity vs. supercritical alternatives (moderate)
• Regulatory pathway unclear; building code acceptance and EN/ISO material certification not addressed (high)

Performance

• Thermal conductivity: 0.053 W/m·K
• Bulk density: ~0.04 g/cc
• Drying process: Ambient pressure (no supercritical)
• vs. premium silica aerogel: ~2.5–3x higher conductivity

Reality check

Laboratory characterisation only (thermal conductivity, density, microstructure). No independent cost-per-m² data. No pilot deployment, field validation, durability testing under real service conditions, or commercialisation roadmap disclosed. Thermal performance claim (0.053 W/m·K) is 2.6–3.5× worse than state-of-art silica aerogel, reducing competitive differentiation. Source is a peer-reviewed journal article; methodology appears sound but scope is confined to bench-scale synthesis and material property measurement.

#aerogel #recycled_content #insulation #circular_economy #waste_valorisation #low_embodied_carbon

Source