FAQ3 views

What is the difference between STC and Rw acoustic ratings?

STC (ASTM E90/E413) is the US sound-rating; Rw (ISO 717-1) is the international one. They measure the same concept but under different standards and must not be converted. NEUWALL reports both where tested.

STC (ASTM E90/E413) is the US sound-rating; Rw (ISO 717-1) is the international one. They measure the same concept but under different standards and must not be converted. NEUWALL reports both where tested.

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