3 ms·

There are vacuum insulated units [1], they need tiny plastic 'microspacers' in them to keep the glass layers apart. 1. https://www.pilkington.com/en/global/pro

• cwillu 3y ago
  And those spacers are rigid, which will remove a lot of the acoustic gains you'd otherwise get from using a vacuum. It's worth noting that, although the page you linked says “good acoustic performance”, the vacuum windows they offer aren't mentioned on their noise control product page, nor listed in their sound simulator tool.