... Wall Glass are hermetically sealed combinations of two or more panes of glass separate by a dry airspace. ... The air trapped between the two pieces of glass acts as an insulator slowing the rate ... ..3. Dew point of insulating glass is up to -50 °C, can reduce outside noise of 30 dB.4. ... industry, curtain wall,train, ship, refrigerator, etc.Normal configuration of CURTAIN WALL glass5+9A+5, 6+9A+6, ...