The heat insulation and sound insulation function is essential, as it allows optimizing the economic and environmental balance by limiting heat loss through the glazing (reduction of energy consumption for heating and its impact on the environment). The lower the U value, the better the insulation.

The new generations of insulating glass contribute to limiting global warming due to greenhouse gas emissions, as agreed by many countries under the Kyoto Treaty. These glazings have now become the unavoidable standard in several European countries that have transposed these agreements into national legislation and action programmes.