Material Properties: Polycarbonate vs Glass vs Acrylic at a Glance
| Property | Polycarbonate (PC) | Glass | Acrylic (PMMA) |
|---|---|---|---|
| Impact strength | 250x glass (ASTM D256, 600–850 J/m) | Baseline (1x) | 10–17x glass (20–35 J/m) |
| Weight (per m² at 4mm) | 4.8 kg | 10.0 kg | 4.8 kg |
| Light transmission (clear) | 88–90% | 90–92% | 92% |
| UV protection | 99.9% UV block (co-extruded layer) | Blocks ~25% UV (standard) | Blocks ~80% UV (standard) |
| Thermal insulation (U-value, 4mm) | 5.9 W/m²K (single); 3.1 W/m²K (twin-wall 10mm) | 5.7 W/m²K (single) | 5.3 W/m²K |
| Service temperature range | -40°C to +120°C | -30°C to +200°C | -30°C to +80°C |
| Flame rating | UL 94 V-0 / V-2 available | Non-combustible | UL 94 HB (burns readily) |
| Scratch resistance | Moderate (can be hard-coated to 2H pencil hardness) | Excellent (6–7 Mohs) | Moderate (3–4H pencil hardness) |
| Lifespan (outdoor, UV-exposed) | 10–15 years (UV-coated); 3–5 years (uncoated) | 30+ years (degradation-resistant) | 5–10 years (yellows over time) |
| Cost (per m², 4mm clear, factory) | $9–18 (solid, FOB China) | $5–15 (tempered, varies by region) | $8–14 (cast acrylic) |
Data sources: ASTM D256 (Izod impact), ASTM D1003 (light transmission), EN 16153 (multi-skin sheets), manufacturer TDS from Bayer Makrolon® and SABIC Lexan™ resin specifications.
Why Polycarbonate Wins for Dome Construction
When selecting a dome shell material, three criteria dominate the decision: safety, insulation, and long-term optical performance. Glass is the clearest and most scratch-resistant option but introduces weight and breakage risk that makes it unsuitable for geodesic structures above 3m diameter. Acrylic is lighter than glass and clearer than polycarbonate when new, but its impact resistance is an order of magnitude lower and UV degradation starts within 3–5 years in full-sun locations.
Polycarbonate offers the best balance for domes. At 250x the impact strength of glass per ASTM D256, a 4mm polycarbonate panel withstands hailstones, wind-blown debris, and accidental impacts that would shatter glass or crack acrylic. The weight advantage versus glass is substantial — a 5m diameter Celenest dome uses approximately 45m² of panel area, saving roughly 235 kg in shell weight compared to glass, which reduces foundation requirements and shipping costs.
For glamping and hospitality applications, polycarbonate’s UV-blocking co-extruded layer is critical. Celenest domes use both-sides UV protection that blocks 99.9% of UV radiation under 380nm. This protects interior furnishings from fading and prevents the panel itself from yellowing. The 10-year UV warranty on Celenest panels reflects factory confidence in this protection — neither untreated acrylic nor standard glass come close to matching this outdoor durability at comparable cost.
Thermal and Acoustic Performance: What the Numbers Say
Dome insulation performance depends on both material and structure. Single-sheet 4mm polycarbonate has a U-value of 5.9 W/m²K, similar to single-pane glass at 5.7 W/m²K. However, Celenest’s twin-wall 10mm multiwall polycarbonate option achieves a U-value of 3.1 W/m²K — a 47% improvement over single-pane glass. For glamping operators in temperature extremes, the choice between single and twin-wall polycarbonate can reduce heating and cooling costs by 30–40% annually.
Acrylic offers marginally better single-sheet insulation (U-value 5.3 W/m²K) but does not benefit from a multiwall construction option. Glass, while available in double-glazed units, adds significant structural weight — a double-glazed 4mm+4mm glass panel weighs approximately 20 kg/m² versus 9.6 kg/m² for twin-wall polycarbonate. The geodesic frame would need to be engineered for the extra load, increasing material and shipping costs.
Sound attenuation is another consideration for hospitality domes near roads or airports. Solid 4mm polycarbonate achieves a weighted sound reduction index (Rw) of approximately 25 dB. Twin-wall 10mm polycarbonate improves this to 29 dB. Single-pane glass is similar at 26–28 dB. For premium glamping sites with noise concerns, Celenest’s twin-wall option provides meaningful acoustic separation without adding glass-level weight.
Installation and Handling: Real-World Differences
Polycarbonate panels are the easiest to handle on-site. A 4mm × 2.1m × 1.2m panel weighs approximately 12 kg — one person can position and secure it. An equivalent glass panel weighs 25 kg and requires two-person handling with suction cups. For remote glamping sites where crane access is impractical, polycarbonate’s weight advantage translates directly to lower labor costs and faster assembly time.
Cutting polycarbonate on-site is straightforward with a circular saw, jigsaw, or CNC router. Acrylic is more brittle and prone to cracking during cutting unless pre-heated. Glass cannot be cut on-site at all — it must be pre-cut to exact dimensions at the factory. For custom dome configurations with irregular panel shapes, polycarbonate’s machinability is a practical advantage that reduces waste and lead time.
Celenest ships dome kits in flat-pack containers with pre-cut, pre-drilled polycarbonate panels labeled by position. A standard 5m dome kit fits in 2–3 pallets (approximately 2.5m³). A comparable glass dome kit would require 5–6 pallets due to weight-based stacking limits and protective interleaving. Freight cost for the polycarbonate kit from Shanghai to Los Angeles is approximately $800–1,200 (LCL) versus $1,800–2,500 for an equivalent glass kit.
Cost Comparison: 5-Year Total Cost of Ownership
| Cost Element | Polycarbonate (Celenest 5m dome) | Glass (equivalent) | Acrylic (equivalent) |
|---|---|---|---|
| Material cost (shell panels, FOB) | $3,500–4,500 | $2,800–4,000 | $3,200–4,200 |
| Frame reinforcement (extra weight) | Not required | $800–1,200 (heavier gauge) | Not required |
| Shipping (LCL, Shanghai→LA) | $800–1,200 | $1,800–2,500 | $800–1,200 |
| Installation labor (2 person, 2 days) | $800–1,200 | $1,200–1,800 (3 person) | $800–1,200 |
| Annual maintenance (cleaning only) | $100–200 | $200–400 (breakage risk) | $150–300 (scratch polishing) |
| Panel replacement (year 5, if needed) | $200–400 (1–2 panels) | $500–1,000 (3–5 panels) | $1,000–2,000 (hazing) |
| 5-Year Total | $5,900–8,900 | $8,300–13,900 | $6,750–10,650 |
Polycarbonate achieves the lowest 5-year total cost of ownership by combining moderate material cost with low shipping, low installation labor, and minimal replacement risk. Glass becomes cost-competitive only for permanent architectural installations where 30+ year lifespan is required and on-site crane access is available. Acrylic’s initial price advantage disappears within 5 years due to surface degradation in outdoor UV exposure.
Recommendation by Application
| Application | Recommended Material | Reason |
|---|---|---|
| Glamping resort (outdoor, full-sun) | Polycarbonate | UV durability, impact safety, insulation options |
| Stargazing lodge (minimal light distortion) | Polycarbonate (optical-grade) | 88–90% transmission, available in optical clarity |
| Permanent architectural pavilion | Glass | 30+ year lifespan, scratch resistance |
| Indoor event space (controlled environment) | Acrylic | Highest clarity, no UV exposure concern |
| Garden greenhouse (hobby) | Polycarbonate (twin-wall) | Best insulation-to-cost ratio |
| Restaurant dining pod (heated interior) | Polycarbonate (twin-wall) | 47% better insulation than single-pane glass |
Bottom line: For outdoor commercial dome applications — glamping, stargazing, hospitality — polycarbonate is the correct engineering choice. It provides the best balance of impact safety, UV durability, thermal performance, and total cost of ownership. Glass is over-engineered for temporary structures and acrylic degrades too quickly in outdoor UV. Celenest domes use Bayer Makrolon® and SABIC Lexan™ virgin polycarbonate with co-extruded UV protection, manufactured under IATF 16949 and ISO 9001 quality systems at our Suzhou factory.