Window film technology
Nano-Particle
A nano-particle is a ceramic, metal or composite particle measured in nanometres (typically 5–100 nm) used as the active rejection ingredient in modern window films.
At nanometre scale, particles behave optically very differently from bulk material. They can be tuned to absorb or reflect specific wavelength bands while remaining small enough not to scatter visible light noticeably.
This is the chemistry that allows a modern Platinum99 film to be visually clear yet reject 90%+ of near-infrared. The nano-particles are too small to see but large enough to interact with IR wavelengths.
Quality control at this scale is precise — particle size distribution, dispersion uniformity, and substrate bonding all influence final performance. This is why premium nano-ceramic films cost meaningfully more than basic carbon.