The acoustic performance of glazing assemblies in Russia is expressed in following term:

Rw - a single number rating of airborne sound insulation between rooms, over a range of frequencies - field measurement [dB]. It is an integral characteristic that serves to assess the airborne sound insulation by one-piece insulation (ranging from 100 Hz to 3000 Hz). This coefficient is intended on an assessment of noise of the room of a household origin.

Abroad following terms are also used:

Sound Transmission Class (STC) is used to measure the sound transmission loss of interior walls, ceilings and floors.

Outdoor-Indoor Transmission Class (OITC) measures the sound transmission loss of exterior glazing applications.

High sound transmission loss – good sound insulation – is desired in many commercial curtain wall applications. Limiting sound transmission through glazing requires review and testing of the entire glazing system.

Laminated glass and insulating glass tend to produce higher OITC ratings because the laminate dampens vibration and the air space limits sound transmission.

For more information, refer to Guardian Technicial Advisory Center .