PolyvisionTM Switchable Privacy Glass
PolyvisionTM switchable privacy glass uses state-of-the-art liquid crystal technology to change from clear glass (75% light transmission) to a white translucent (55% transmission) with the flip of a switch.
When the power is turned on, the liquid crystals align and the window is clear. Power draw is very low – just 0.5 watts/sq ft. When the power is turned off, the liquid crystals return to their normal scattering positions and the glass becomes a translucent white pane.
PolyvisionTM panels have proven their durability and performance in the field, with installations more than ten years old – one commercial application is over 18 years old – and still functioning.
|Maximum pane size||72” x 120” (1828 mm x 3048 mm)|
|Glass Colors||Clear, Bronze, Gray, and Green|
|Visible transmission (Transparent)||75%|
|Visible transmission (Translucent)||55%|
|View Angle||approx. 150°|
|Thickness||9/16” (interior/door); 1” (exterior) (other thicknesses available)|
|Power draw||< 0.5 watt/ft2 (5 watt/m2)|
|Minimum “off” time||4 hr/day|
HOW IT WORKS
PolyvisionTM glazing is a sandwich of conventional glass laminated to liquid crystal technology. A typical interior glazing unit is made of a sheet of 5 or 6 mm annealed glass on each side, with the liquid crystal Switchable Privacy Film packaged in between. The film package consists of two layers of transparent conductive films enclosing PDLC (Polymer Dispersed Liquid Crystal) material. The film includes electrical wiring that connects to a transformer, which supplies power for the pane’s operation.
PolyvisionTM is a medium whose light scattering power is adjustable through applying an electric field. In their natural (uncharged) state, the PDLC droplets randomly align. The ordinary refractive index of these liquid crystals does not match that of the polymer, so the incident light is scattered white translucent. When an electric field is applied across the material, the PDLC droplets re-orient, and incident light can pass through, resulting in the transparent state.
Switchable Privacy Glass is a sustainable product that can lower energy consumption and energy costs by improving the use of natural day-lighting, lowering energy use for illumination; and by reducing solar heat-gain, thereby reducing air conditioning demands.
PolyvisionTM panels have very low power requirements. The glass draws less than 0.5 watts/sq ft. By contrast, a typical solar (photovoltaic) panel installed in North America has an average output of about 10 watts/sq ft, meaning that one single 25” x 54” solar panel could potentially offset the power usage of three of our largest (72” x 120”) windows.
PolytronixTM is aware of the importance of limiting our carbon footprint, and works proactively with our suppliers and application partners to ensure that our glass/film products are eco-friendly. The main ingredient of a PolyvisionTM panel is glass, a material with a well-established and widespread recycling infrastructure. Recycled glass is a regular component of modern glass-making, and significantly lowers the CO2 emissions associated with manufacture.Polyvision panels are re-usable – glazing can be removed from its original installation and re-used, fully functionally, in another building Liquid crystal components are organic and biodegradable Blocks over 80% of infrared and over 99% of ultraviolet radiation Reduces solar heat-gain, lowering energy consumption for HVAC Very low power draw (equivalent to a clock radio) Reduces materials-consumption used to make curtains, shutters, blinds, projection screens, and dry erase boards Eliminates the need for dust-collecting draperies, blinds, or shutters, improving indoor air quality (IAQ) Proven service life of greater than 10 years (10-year old installations are still fully functioning)