Tests
6
Effect of Insulation
Rw range
7–25dB
spread 18 dB
Highest Rw
25dB
GW 210 mm R5
Largest ΔRw vs first
+17dB
GW 210 mm R5
Sound reduction index
R′ from the 2270, re-referenced to the 0.9216 m² specimen area (−0.35 dB). Grey lines: reference bounds.
Single-number ratings
Open in explorer| Varies | Test | Rw | C | Ctr | ΔRw vs first | ΔRw vs open | Mean R | |
|---|---|---|---|---|---|---|---|---|
| No Insulation | Project003 | 7 | 0 | 0 | ref. | +7 | 8.3 | |
| GW 45 mm R2.5 | Project019 | 14 | 0 | −1 | +7 | +14 | 13.0 | |
| GW 90 mm R2.5 | Project020 | 19 | 0 | −2 | +12 | +19 | 17.4 | |
| GW 100 mm R5 | Project023 | 17 | −1 | −2 | +9 | +16 | 14.7 | |
| GW 175 mm R3.5 | Project024 | 19 | 0 | −2 | +12 | +19 | 16.8 | |
| GW 210 mm R5 | Project022 | 25 | −1 | −4 | +17 | +24 | 22.6 |
Rw, C and Ctr per ISO 717-1 over 100–3150 Hz. ΔRw fits the reference curve to the band-by-band difference curve, which is not the same number as subtracting two separately rounded Rw values. Mean R is the arithmetic mean over the 16 rating bands.