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.
FAQOct 16, 20262 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.
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