| Structural Composition |
Utilizes advanced nano-particle materials combined with specially selected polymer structures, integrated with particles capable of reflecting solar radiation and delivering strong thermal emissivity |
Mainly uses conventional Acrylic/Polymer resins combined with reflective pigments such as Titanium Dioxide (TiO₂) and hollow ceramic microspheres |
| Operating Mechanism |
Simultaneously reflects solar heat and actively radiates heat outward into outer space |
Only reflects part of the sunlight and provides thermal insulation (slowing heat transfer into the building) |
| Cooling Principle |
Active two-way cooling |
Passive cooling |
| Heat Reflection Capability |
From 94.6% to 98% |
Approximately 80% – 85% |
| Reflected Wavelength Range |
Reflects across a broad spectrum from approximately 0.3 – 3 µm, including the visible light range of 0.3 – 0.7 µm and thermal infrared range of 0.7 – 3 µm |
Narrower range, mainly concentrated in the near-infrared region around 1 µm. |
| Thermal Radiation Mechanism |
Up to 99%. RARE paint converts accumulated heat into far-infrared radiation and dissipates it directly outward through the “atmospheric window” (8–14 µm wavelength), enabling the material surface to cool itself actively. |
None |
| B. REAL-WORLD PERFORMANCE |
| Roof Surface Temperature Reduction Capability |
Reduces temperature by 15°C – 40°C; the higher the outdoor temperature, the stronger the cooling performance |
Reduces temperature by approximately 5°C – 15°C; however, the roof surface still accumulates heat and remains hot after prolonged heat absorption |
| Indoor Air Temperature Reduction Capability |
Reduces indoor air temperature by approximately 7°C – 15°C under hot weather conditions with outdoor temperatures above 35°C |
Reduces indoor air temperature by approximately 3°C – 5°C; however, heat still accumulates indoors and remains trapped during subsequent hot days. |
| Nighttime Cooling Capability |
Thanks to its continuous thermal radiation mechanism, the coating helps the building cool itself both day and night, while also “refreshing” the entire structure after a full day of heat absorption and maintaining a comfortable cool feeling until the next morning. |
None. After the surface has absorbed heat throughout the day, the paint layer continues to retain and radiate heat into the building, causing the indoor space to remain hot at night |
| Heat Accumulation |
Minimal to no heat buildup |
Continues to absorb UV and thermal infrared radiation, resulting in heat buildup on both the surface and within the building structure |
| Indoor Comfort Level |
Cool and comfortable, with a thermal sensation similar to being in the shade |
Reduced heat sensation, but the indoor environment still feels stuffy and thermally uncomfortable |
| Power Saving Capability |
Saves at least 30% of cooling electricity costs |
Limited effectiveness |
| Self-Cleaning Capability |
Nano SkyActive self-cleaning technology activated by rainwater, maintaining high solar reflectance for many years |
Easily accumulates dust, reducing performance over time |
| Durability of Heat-Reduction Performance |
Maintains long-term reflective performance |
Heat-reduction effectiveness gradually declines as the surface accumulates dust or undergoes prolonged heat absorption |
| UV Resistance |
Superior UV resistance |
Moderate |
| Rust, Waterproofing, Alkali, and Salt Resistance |
Superior protection |
Limited protection effectiveness |
| Structural Service Life |
Over 10 years |
Prone to deterioration after 2–3 years |
| Environmental Impact |
Effectively reduces the urban heat island effect by minimizing heat accumulation, lowering heat emission to the surrounding environment, saving energy, and reducing CO₂ emissions |
Not fully optimized; the surface still absorbs and accumulates heat, then continues releasing it into the surrounding environment, contributing to the urban heat island effect |
