Generally 8mm needs to be filled with argon.
In fact, \"insulating glass\" is not \"empty\
The interlayer, or 8mm thick space, must be filled with the inert gases argon and krypton.
After filling, the test shows that its K value (the limit value of heat transfer coefficient) can be reduced by 5% compared with the vacuum state, which means that the insulation performance is better.
In other words, if the selected insulating glass is really \"empty\" in its sandwich, it undoubtedly shows that its insulation or thermal insulation performance is at best double glass, and the effect of thermal insulation and energy saving is inevitably poor, scientific testing has proved that qualified insulating glass can make the general window glass heat transfer coefficient limit k value can be reduced from the original 3.5 to 2.8. Reduced heat transfer makes it harder for the house to lose heat.