Our film · Chemistry
Sputter window film
LUNOX manufactures sputter window film in Gyeonggi-do, Korea for architectural curtain wall projects, tint-shop distributor networks, and white-label brands. Sputter is our flagship chemistry — the film specified for the 555 m Lotte World Tower, Incheon International Airport, and 30+ tier-1 office buildings across Seoul.
What sputter window film actually is
Sputter window film uses magnetron sputtering to deposit ultra-thin metallic layers onto optical-grade PET. The typical stack is nickel-chrome for structural stability plus silver-nano for optical properties, sometimes with a titanium or copper interlayer. The metal layers reflect infrared at the glass face rather than absorbing it — which is what gives sputter its signature performance advantage over ceramic and carbon films on large architectural glazing.
For a deep-dive on the manufacturing process, see the magnetron sputtering process guide.
How LUNOX manufactures sputter film
Sputter film production is fundamentally a semiconductor-adjacent process. LUNOX's sputter chambers run non-deforming Ni-Cr targets and high-purity silver-nano deposition under vacuum, applying metal layers atom-by-atom onto optical-PET substrate. The critical production variables:
- Target quality: non-deforming Ni-Cr targets hold spec through hundreds of production hours vs cheap targets that warp and produce inconsistent coating.
- Vacuum integrity: production cleanroom holds ISO Class-7 particulate spec, matching the class used for automotive OEM ceramic production.
- Layer thickness control: sub-100 nm metal layer tolerance across the roll width, verified on 100% inline optical QC.
The LUNOX sputter product lines
| SKU | Color | VLT | IRR | UV | TSER | Solar absorbance |
|---|---|---|---|---|---|---|
| Broco 20 | Bronze | 16.5% | 95.1% | 99.9% | 83.1% | 37.4% |
| Broco 35 | Bronze | 35.0% | 83.2% | 99.9% | 69.5% | 37.3% |
| Broco 50 | Bronze | 50.1% | 67.9% | 99.9% | 55.6% | 35.4% |
| Sputter Max 20 | Grey | 20.4% | 82.9% | 99.9% | 70.9% | 49.2% |
| Sputter Max 35 | Grey | 39.3% | 62.8% | 99.9% | 56.1% | 52.2% |
| Sputter Max 50 | Grey | 44.6% | 65.0% | 99.9% | 56.1% | 48.4% |
| Sputter Supreme 20 | Neutral | 19.3% | 97.0% | 99.9% | 69.3% | 40.2% |
| Sputter Supreme 35 | Neutral | 36.3% | 95.6% | 99.9% | 62.0% | 31.8% |
| Sputter Supreme 50 | Neutral | 42.9% | 95.5% | 99.9% | 61.4% | 27.5% |
Where sputter wins vs ceramic vs carbon
Sputter is the specification chemistry for large architectural glazing: west and south elevations of tall buildings, glass-heavy curtain walls, projects where cooling-load reduction on treated elevations translates to seven-figure HVAC savings over the building's lifecycle. Sputter reflects heat at the glass surface, keeping mullions and the structural frame cooler than absorptive films would.
Sputter is not the right chemistry for signal-sensitive installations (automotive, hospitals, offices with embedded antennas) — the metal layers attenuate cellular and GPS signals by 6–20 dB. For those applications specify ceramic or carbon instead.
OEM and wholesale terms
- MOQ: 500 rolls first order; 2,000 rolls distributor tier; 2,000 rolls per SKU for custom-spec.
- Lead time: 4–6 weeks stock; +2–3 weeks custom.
- Shipping: FOB Busan or DDP to 20+ countries.
- Warranty: 10 years, color-stable across every tier; issued in OEM partner's name for white-label.
- Certifications: ISO 9001 production, TÜV Rheinland test verification, RoHS conformity, CoA per container.
What buyers typically ask next
What is sputter window film?
Sputter window film uses magnetron sputtering to deposit thin metallic layers (typically nickel-chrome, silver-nano, or a stacked combination) onto optical-grade PET substrate. The metallic layers reflect infrared at the glass surface rather than absorbing it — giving sputter the highest heat rejection of any window film category. Sputter is the specification standard for signature architectural projects: Lotte World Tower (555 m), Incheon Airport, high-rise curtain wall retrofits.
How does sputter compare to ceramic film?
Sputter reflects heat; ceramic absorbs it. On a large curtain wall, that difference matters — absorbed heat becomes glass temperature, which becomes mullion temperature, which becomes HVAC load. Sputter TSER runs 69–83% on our top tiers vs 82.5% peak for ceramic — but ceramic peaks are at 5% VLT (dark limo tint) where sputter isn't the market. At architectural VLT tiers (20%–50%), sputter delivers superior real-world heat rejection.
Does sputter film block 5G, GPS, or cellular signals?
Yes, sputter film attenuates cellular and GPS signals by 6–20 dB depending on the metal stack. For signal-sensitive applications (automotive, hospitals, offices with embedded antennas), specify ceramic or carbon instead. For architectural work where signal is delivered by wired infrastructure, sputter's heat-rejection advantage typically outweighs the signal trade-off.
What sputter product lines and VLT tiers does LUNOX ship?
Three colorways across nine SKUs. Broco (bronze): Broco 20 (16.5% VLT), Broco 35 (35%), Broco 50 (50.1%). Sputter Max (grey): Sputter Max 20 (20.4%), 35 (39.3%), 50 (44.6%). Sputter Supreme (neutral): Sputter Supreme 20 (19.3%), 35 (36.3%), 50 (42.9%). Every tier rejects 99.9% of UV.
What's the warranty on sputter film?
10-year color-stability warranty across Broco, Sputter Max, and Sputter Supreme. The metal layers don't oxidize when properly encapsulated — a well-installed sputter film looks the same at year 10 as it did at year 1. Field warranty claims across LUNOX's 30-year production history run below 0.1%.
Can sputter film be applied to laminated or tempered glass?
Yes, but installation requires thermal-stress analysis per glass type — sputter's high solar absorptance changes the thermal profile of the glazing unit. LUNOX provides thermal-stress guidance per glass configuration and certifies installer partners for architectural sputter projects. See the sputter-installation guide for details.
What's the MOQ for OEM sputter film?
500 rolls for a first order; 2,000 rolls for distributor pricing tier; 2,000 rolls per SKU for custom-spec runs. Standard roll 152 cm × 30 m; custom widths from 90 cm to 183 cm on OEM programs. Lead time 4–6 weeks stock; +2–3 weeks for custom.
Which projects has LUNOX sputter film been specified for?
The 555 m Lotte World Tower curtain wall (Seoul, world's 6th tallest), Incheon International Airport terminals, plus 30+ tier-1 office buildings across Seoul (typically retrofit projects for energy-code compliance). Full case study: see the Lotte World Tower architectural retrofit guide.
Request a sputter sample kit See the architectural lineup
The sputter film library: How magnetron sputtering works · Sputter vs nano-ceramic · Sputter film vs Low-E glass ROI · Curtain-wall specifier's guide · HVAC energy savings · 30-year color stability · Installation by glass type · Tall-building engineering · Why Korea leads in sputter film · Lotte World Tower case study · Low solar absorbance film