Double insulating glass is highly effective in reducing heat and stopping unwanted sound transmission. It can help to reduce the level of noise and energy consumption in common you can have a Low-E Clear Glass 6+6+6, which is 6mm glass.
In this, you can choose
Annealed Glass: either one or both
Tempered Glass: either on or both recommended both tempered
Laminated Glass:either one or both recommended at least one laminated
Clear Glass:either one or both
Reflected or Coated Glass:
Recommeneded one refelected or coated preferably outside glass and on surfce two (mirror surface)