NRC stands for Noise Reduction Coefficient and is a standard rating for how well a material absorbs sound. NRC ratings range from 0 to 1. An NRC of 0 means the product absorbs no sound; an NRC of 1 means the product absorbs 100% or all sound. Thickness and density of a product are two factors in calculating NRC.

The Sound Transmission Class (STC) is a single number rating of how many decibels of sound are blocked by a panel. A higher STC rating blocks more noise from transmitting through a panel.

NRC is a measurement of how well a product absorbs sound, while STC measures how well a product blocks sound from escaping the room. If you are in a noisy room like a gymnasium, you want a product with a higher NRC on the walls or ceiling to make the room less noisy. An STC rating is important when you want to limit the transmission of sound through a wall or from one room to another. The higher the STC rating, the less the sound will transmit through a barrier say, from one classroom to another. A good application for a high STC material would be a music room that is adjacent to a classroom. In this application you want as little sound to transfer from the music room to the adjacent classroom.

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