Aerogel
Frozen smoke — the lightest solid material on Earth
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Aerogel is an ultralight porous material (density 1–2 kg/m³ for pure SiO₂, 20–200 kg/m³ for furniture-grade forms) consisting of 95–99.8% air. Produced by drying gel under supercritical conditions (CO₂ at 73 atm, 31°C). Thermal conductivity: 0.013–0.020 W/(m·K) — 2–3× lower than still air, a record among solids. Developed by NASA for space thermal insulation (Mars Pathfinder, 1997). In furniture, aerogel serves as a thermal-barrier interlayer (between hot/cold zones), panel fill (ultra-thin walls with maximum insulation), and decorative element (translucent aerogel panels with a 'frozen fog' effect). Standards: ASTM C1728 (aerogel blankets), EN 14303 (thermal insulation products).
TECHNICAL PASSPORT
In our practice aerogel is a rare and striking material: 5 projects in 4 years. Primary uses: (1) thermal insulation of built-in fireplaces and grills in bar counters (a 10 mm aerogel blanket replaces 50 mm mineral wool — space saved); (2) translucent LUMIRA® (Cabot) aerogel panels in light-diffusing partitions — a 'floating fog' effect with heat insulation; (3) thermal-separation interlayers between stone and wood (stone heats up from built-in appliances — aerogel blocks heat transfer). Key suppliers: Cabot (LUMIRA®, granular form), Aspen Aerogels (Pyrogel® / Cryogel® blankets), BASF (Slentite® — aerogel boards). Limitations: high fragility of pure aerogel, dusting, cost (from $90/sq ft for panels).
Varieties & Types
Aerogel Granules (LUMIRA®)
$$$$Cabot (USA) — SiO₂ aerogel granules 0.7–4 mm
Translucent aerogel granules filled between glass panes (16–40 mm gap). Light is diffused — a 'frozen fog' effect. Insulation: U=0.5–1.0 W/(m²·K). For light panels, partitions, skylights. Used in Kalwall and Pilkington Profilit systems.
Aerogel Blankets (Pyrogel® / Cryogel®)
$$$$Aspen Aerogels (USA) — flexible rolls 5–10 mm
Flexible roll material: aerogel on a glass-fiber substrate. Thickness: 5–10 mm. Thermal conductivity: 0.015 W/(m·K). For thermal insulation: built-in fireplaces, grills in bar counters, hot/cold zone separation. Temperature range: −328°F to +1,202°F.
Aerogel Boards (Slentite®)
$$$$$BASF (Germany) — rigid PU-aerogel panels
Rigid panels of polyurethane aerogel. Thickness: 15–30 mm. Insulation: λ=0.017 W/(m·K). Density: 120–180 kg/m³. Workable like foam: cut, glued. For thin-walled furniture constructions with maximum insulation. Dust-free (unlike SiO₂ aerogel).
Decorative Aerogel (Translucent Panels)
$$$$$Monolithic SiO₂ aerogel in a glass sandwich
A monolithic block of aerogel (bluish, translucent) laminated between glass. Light passes, heat does not. Effect: 'morning fog window' with a blue tint (Rayleigh scattering). For art installations, boutique displays, VIP zones. Fragile, expensive, but visually unique.
Advantages
- ✓Record thermal insulation — 10 mm aerogel = 50 mm mineral wool
- ✓Ultralight — density from 1 kg/m³ (lighter than air under some conditions)
- ✓Translucency — LUMIRA® granules let light through, creating a 'frozen fog' effect
- ✓Fireproof — SiO₂ = non-combustible (A1), safe for fireplaces and grills
- ✓Hydrophobic — does not absorb water (treated surface)
- ✓Sound insulation — NRC 0.7–0.9, absorbs noise across a broad frequency range
- ✓Extreme range — operates from −328°F to +1,202°F
- ✓Space pedigree — NASA, Mars Pathfinder — marketing wow factor
Limitations
- ⚠Fragility — pure SiO₂ aerogel crumbles under pressure (needs a protective shell)
- ⚠Dusting — SiO₂ granules generate dust during handling (PPE and sealed housing required)
- ⚠High cost — from $90/sq ft for decorative panels
- ⚠Limited mechanical strength — not structural, insulation/decorative only
- ⚠Machining difficulty — cannot drill or mill pure aerogel (it will shatter)
- ⚠Niche application — not a mass-market material, for specialized solutions
Applications
Thermal insulation in bar counters — a 10 mm Pyrogel® aerogel blanket between a grill/fireplace and the wooden cabinet. Blocks heat transfer (λ=0.015). Space: 10 mm vs. 50 mm mineral wool. For built-in grills and fireplaces in HoReCa furniture.
Translucent partitions — LUMIRA® granules between glass panes. Light passes (40–80%), heat does not. Effect: soft diffused light without direct view. For office partitions, lobby zoning, bathrooms.
Ultra-thin insulated walls — Slentite® 20 mm boards inside furniture panels. For built-in fridges and wine cabinets: minimal wall thickness with maximum insulation. Saves 1.2–1.6 in of depth.
Art installations — monolithic aerogel in a glass sandwich. A bluish translucent block floating in a frame. For galleries, boutiques, VIP zones. Rayleigh scattering effect — a sky-blue tint.
Acoustic panels — aerogel granules in perforated panels. NRC 0.7–0.9 at 30–50 mm thickness. For conference rooms, studios, restaurants. 3–5× lighter than standard acoustic panels.
Insulation for heated countertops — aerogel blanket between the heating element and substrate. All heat goes up (to the surface), none down (to the cabinet). Heating efficiency: +30–40% from reflected heat.
Pricing & Economics
Pricing Factors
- ·Form — blankets cheapest, granules mid-range, monolithic most expensive
- ·Thickness — direct relationship (10 mm vs. 30 mm = 3× price)
- ·Brand — Cabot, Aspen, BASF = premium; Chinese alternatives = 30–50% less
- ·Volume — at 50+ sq ft batch, price drops 15–25%
- ·Installation — sealing and protective housing = 20–30% of material cost
- ·Decorative — monolithic aerogel in glass = 3–5× the cost of granules
Care & Longevity
Daily Care
Aerogel is hidden inside the construction — no daily care needed. Care for the exterior surface (glass, wood, metal) — standard. Don't open the housing unnecessarily — aerogel granules generate dust.
What to Avoid
Don't open the sealed aerogel housing — SiO₂ granules dust (fine silica particles). Don't compress monolithic aerogel — fragile, will crumble. Don't wet SiO₂ blankets without hydrophobic treatment — they lose insulating properties.
Periodic Maintenance
Thermal insulation: inspect housing integrity every 2 years (no gaps where granules could escape). LUMIRA® panels: clean exterior glass — standard. Slentite® boards: no maintenance required (sealed in construction).
Professional Care
Aerogel replacement: if housing is damaged — open, replace, reseal (from $30). Decorative panels: replacement = new panel + installation. Thermal insulation diagnostics: thermal imaging survey (from $18 per object).
Expert Reviews
Average Rating · 5 expert reviews
«Pyrogel® 10 mm aerogel blanket is my standard for insulating built-in grills in bar counters. Replaces 50 mm mineral wool: saves 40 mm — that's an entire shelf inside the counter. In 3 years — 20+ grills, zero cabinet overheating issues. Downside: price ($24/sq ft), but for HoReCa — pocket change.»
«LUMIRA® partition in an IT office: 10 × 8 ft, double glass 6+6, 20 mm gap filled with granules. Light passes through softly diffused; people's silhouettes — invisible. Client is thrilled: 'like morning fog, frozen.' Downside: granules dust during installation — crew needed respirators. The finished result is clean and eternal.»
«Slentite® 20 mm in the walls of a built-in wine cabinet — instead of 60 mm foam. Difference: +40 mm of interior volume = 8 extra bottles in the same shell. Insulation: stable 54°F inside at 77°F outside. Material is expensive ($72/cabinet), but for premium — justified.»
«A partition between bedroom and bathroom — LUMIRA® in glass. Bathroom light passes through beautifully, softly; you can't see through. Sound is noticeably dampened. But: it cost $1,080 (32 sq ft) — astronomical. Standard frosted glass would have been $120. Justified? Visually — yes; rationally — questionable.»
«Aerogel is the material of the future. Designed a bar with a fireplace: without aerogel — 80 mm wall (mineral wool + steel). With aerogel — 15 mm (blanket + steel). Saved 65 mm — that's 2 extra shelves inside the structure. Client doesn't see the aerogel but sees more room for bottles. That is innovation: invisible yet tangible.»
Frequently Asked Questions
Yes — pure SiO₂ aerogel has a density of 1–2 kg/m³ (record: 1.9 mg/cm³). That's 500× lighter than water and only 1.5× heavier than air. It's 95–99.8% air, trapped in a nanoscale silica network. Furniture-grade forms are denser (20–200 kg/m³) but still 5–50× lighter than conventional insulators.
Aerogel pores are so small (2–50 nm) that air molecules cannot move freely — convective heat transfer is suppressed. This is the 'Knudsen effect': when pore size is smaller than the mean free path of air molecules (68 nm), gas thermal conductivity drops. Result: 0.013 W/(m·K) — lower than still air (0.026 W/(m·K)).
Three main uses: (1) thermal barrier — thin interlayer between a heat source (fireplace, grill) and furniture body; (2) translucent partitions — light passes, heat and views do not; (3) ultra-thin walls — for mini-fridges and wine cabinets (20 mm wall instead of 60 mm foam). Bonus: acoustic panels (NRC 0.7–0.9) and art objects.
In a finished product (sealed housing) — absolutely safe. SiO₂ = quartz = glass — non-toxic, non-combustible (A1). Hazard: during installation SiO₂ granules generate fine silica dust (like fiberglass). Workers use PPE (respirator, gloves). PU aerogel (Slentite®) is dust-free. In the finished product, dust is fully contained.
Thermal blanket 10 mm: $18–$30/sq ft. Translucent panel with LUMIRA® 30 mm: $60–$90/sq ft. Slentite® board 20 mm: $48–$90/sq ft. Decorative monolithic aerogel in glass: $180–$360/sq ft. For a typical use case (thermal barrier in a bar counter, 5 sq ft): $90–$150.
Yes — aerogel feels like foam or dry chalk: light, slightly rough, leaves no marks (if hydrophobic). But pure SiO₂ aerogel is fragile — strong pressure and it crumbles. Monolithic aerogel in glass — you don't touch it (it's inside). Slentite® — denser, withstands moderate pressure. LUMIRA® granules — loose, like fine gravel.
Rayleigh scattering — the same physical effect that makes the sky blue. Nanoscale silica particles (2–5 nm) scatter short (blue) wavelengths more strongly than long (red) ones. In reflected light — aerogel is blue; in transmitted light — yellowish. The smaller the particles, the bluer. This effect is used in decorative panels as 'celestial glow.'
Main suppliers: Cabot (LUMIRA® granules — through distributors), Aspen Aerogels (Pyrogel® blankets — industrial suppliers), BASF (Slentite® — through construction distributors). Lead times: 2–6 weeks. Minimum order: typically from 1 sq m (10 sq ft).
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