Smart film, also called switchable or PDLC film, turns ordinary glass from clear to frosted at the flick of a switch. A small electric current lines up the liquid-crystal particles in the film so light passes straight through; cut the power and the glass turns opaque white in an instant. It is used for on-demand privacy on partitions, conference rooms, bathrooms and shopfronts. Protek Devices supplies and fits switchable film in Pakistan, custom-made for each pane, and quotes it after a survey.
Glass that turns from clear to private at the press of a button used to be a feature of airport lounges and boardrooms in films. It is now something you can fit to your own office partition or bathroom. The technology is called PDLC, and the everyday names for it are smart film, switchable film, smart glass and privacy glass. They all describe the same thing: a film, or a glass panel, that changes from see-through to opaque on command.
What PDLC actually is
PDLC stands for polymer-dispersed liquid crystal. The film holds millions of microscopic liquid-crystal droplets between two clear conductive layers. With no power, the droplets sit at random angles and scatter light, so the glass looks frosted white. Apply a small electric current and the droplets line up, light passes straight through, and the glass turns clear. The switch is instant, and it can run from a wall switch, a remote, a phone app or a sensor.
One detail surprises people: PDLC is clear when powered and opaque when off. The glass is private by default and goes transparent only while it is switched on. That also means a power cut leaves the glass private, not exposed, which is usually what you want in a meeting room or a bathroom.
Where switchable film works well
Smart film earns its place wherever you want privacy sometimes, not always:
- Conference and boardrooms: clear glass walls that turn opaque for a private meeting.
- Office partitions and cabins: an open feel that closes off on demand.
- Bathrooms and bedrooms: a clear view that frosts at a touch.
- Shopfronts and showrooms: a display window that becomes a private fitting area or a screen after hours.
It can also double as a rear-projection screen, since the opaque white state takes a projected image well.
Smart film or smart glass?
There are two ways to buy this. Smart film is applied to your existing glass, which suits a retrofit on partitions and windows already in place. Smart glass is a sealed panel with the film laminated inside, made for new installations and wet areas. Both use the same PDLC principle. Which one fits depends on whether you are upgrading existing glass or building new, and a survey settles it.
What about price and control?
Switchable film is a premium, custom-made product, so it is priced per panel after measuring, not from a standard per-square-foot rate like ordinary film. The control method affects the cost too: a simple wall switch is the basic option, while a remote, app control or occupancy sensor adds convenience and a little to the price. Tell us the glass, the area and how you want to switch it, and we will quote it precisely. We will also be straight about where ordinary frosted film would do the same job for far less, because switchable film only earns its cost where you genuinely need the glass to change.
Key takeaways
- Smart, switchable and PDLC film all mean glass that switches clear to private on command.
- It is clear when powered and frosted when off, so a power cut leaves it private.
- It suits conference rooms, partitions, bathrooms and shopfronts, anywhere privacy is occasional.
- It is cut to size and quoted per panel; frosted film is far cheaper where the glass need not change.