Higher upfront cost
It costs more than blinds or plain glass. The convenience, daylight and finish are what you pay for.
Honest answers
The disadvantages of smart glass
We would rather you knew the trade-offs upfront. Here are the real disadvantages of PDLC switchable glass, and which ones actually matter.
The honest trade-offs
Power to stay clear
The film draws a small current to remain transparent (about 5W per square metre). It is tiny, but not zero.
Some haze
Even good PDLC has a slight haze in the clear state. Premium film keeps it under 5%; budget film is noticeably milky.
Not soundproof alone
Film alone does little for noise. Only laminated glass adds meaningful acoustic separation.
Cheap film degrades
Low-grade film without UV inhibitors can yellow or fail at the edges within a few years.
Not a security barrier
Opaque glass hides a view but is not impact-rated unless you specify a security laminate.
Which of these actually matter
Most of these are manageable with the right specification. Buy quality film with UV inhibitors, use laminated glass where sound or durability matter, and put critical panels on backup power. Do that and the only real trade-off left is the upfront cost.
The disadvantage that catches people out is cheap film. The technology is only as good as the ITO coating and adhesives behind it, so the lowest quote is rarely the cheapest over ten years.
Common questions
What are the disadvantages of smart glass?
The main ones are higher upfront cost, a small power draw to stay clear, slight haze in the clear state, limited soundproofing from film alone, and early failure of low-quality film. Most are avoidable with the right specification.
Does smart glass use a lot of electricity?
No. PDLC draws about 5 watts per square metre while clear and nothing while private. Ten square metres uses less than a single LED bulb.
Is smart glass worth it?
For privacy on demand, borrowed daylight and a premium finish, most clients find it worth the cost, especially in laminated form where it also lasts 20 years or more.
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