Silentium Alto
Rw 51 dB
Silentium Alto uses the same 100 mm aluminium structure as Silentium 100 with an asymmetric glazing build-up: one monolithic pane and one laminated pane. The complete assembly was measured to ISO 10140-2 at the same accredited laboratory; the rating to ISO 717-1:2020 is Rw 51 dB.
Laboratory tested
51Rw dB
C −1 · Ctr −4
Rw is the weighted sound reduction index: a single-number laboratory rating of airborne sound insulation. C and Ctr are the spectrum adaptation terms for mid-frequency and low-frequency dominated noise.
Test record
- Result
- Rw 51 dB (C −1 · Ctr −4)
- Measurement standard
- ISO 10140-2
- Rating standard
- ISO 717-1:2020
- Tested specimen
- 12 mm float glass · 60 mm air gap · 6 + 6 mm laminated glass
- Total construction depth
- 100 mm
- Specimen area
- 1.85 m²
- Laboratory
- GiB mbH · Arnstorf, Germany
- Accreditation
- DAkkS · ISO/IEC 17025 · D-PL-18520-01-00
- Report number
- E260413A1/1_rev00
- Date of test
- 13 April 2026
- Report date
- 14 April 2026
What this figure covers, and what it does not.
Laboratory tested: Measured on the complete assembly at an accredited laboratory. Report reference published.
- The figure is a laboratory value for the tested asymmetric specimen described above, with flat glass on both faces.
- Decorative faces such as fluted or textured glass change the build-up. They are assessed by the engineering team per project and are not covered by this test.
- Performance measured on site depends on installation quality, flanking paths and room conditions. No site measurement is claimed here.
- Door-sets within a partition run have their own acoustic performance and are not covered by this report.
The laboratory report.
This page is a summary. The complete report, with the measured one-third-octave values and the specimen description, is issued to architects and consultants.
GiB test report E260413A1/1_rev00
Acoustic test report · Silentium Alto · tested specimen · PDF · rev00 · 14 April 2026
Full laboratory report. Issued to architects and consultants on request.
Silentium Alto
Laboratory-tested acoustic separation with an asymmetric glazing build-up.