A. Outer hardcoat (scratch & weather barrier)
A UV/thermally cured hardcoat protects the functional stack from abrasion, chemicals and weathering. It preserves surface gloss and prevents mechanical or environmental damage to the underlying sputtered/ceramic layers during handling and installation.

B. Optical overcoat 
A transparent tuning layer that mutes metallic glare, controls visible reflection and refines the film’s perceived tone. It also acts as an interface between the hardcoat and the optical stack to maintain optical neutrality and consistent aesthetics.

C. Nano-ceramic functional layer
A dispersion of non-metallic nano-ceramic particles that increases IR absorption/scattering, improves thermal stability and reduces the metal layer’s sensitivity to oxidation. By adding targeted ceramic functionality the film raises overall TSER while enabling non-metallic signal-friendly options—core to PROKHAR’s high-end nano-ceramic strategy.

D. Dielectric optical stacks (multi-layer interference layers)
Alternating high/low refractive index dielectric layers tune phase relationships in the stack so the film selectively reflects NIR/short-wave IR while transmitting visible light with minimal colour shift. These interference layers enable precise spectral shaping (visible vs NIR) and are critical to achieving high IRR with low VLT impact.

E. TiN magnetron-sputtered functional layers
Ultra-thin TiN sputtered layers provide metallic-like selective reflection in the NIR while remaining relatively transparent in the visible band. When alternated with dielectrics, TiN enables strong NIR rejection, refined spectral curves and controlled colour bias—delivering the “spectral selectivity” that separates premium PROKHAR TiN films from dyed or bulk-metalized products.

F. Sealing dielectric layer
A dense oxide/nitride barrier prevents moisture and oxygen ingress to the metal/ceramic stack, improving corrosion resistance and long-term durability—particularly important for sputtered metal layers exposed to humid or coastal environments.

G. PET carrier 
Optical-grade PET provides dimensional stability, handling strength and a flat optical substrate for sputtering and coating. PET thickness is selected to balance cut-ability, shrink behaviour and on-vehicle conformability.

H. Pressure-sensitive adhesive (PSA)
A transparent, UV-stable PSA bonds the film to glass. Formulated to resist yellowing, maintain peelable removability and ensure long-term adhesion without leaving residue.

I. Release liner
Protective liner keeps rolls clean and non-sticky during storage and shipping; it is peeled away immediately before installation.