quint-it qi2 Acoustic Glass Partition — Up to 51.6 dB Certified by Fraunhofer
The question people ask most often about glass partitions is: does it really keep the sound out? With the quint-it qi2 system the answer comes as a figure, tested and published by the Fraunhofer IBP in Munich: up to 51.6 dB in the door and 49 dB in the partition.
The proof in figures: when glass insulates as well as concrete
The old belief that glass cannot keep sound out belongs to the past. The quint-it qi2 system is a glazed office partition designed specifically for sound insulation: every detail of its build — the double acoustic laminated glass, the special connecting profiles, the perimeter seals and the floor seals — has been worked out to get the most out of airborne sound reduction.
The performance of the quint-it qi2 system was measured by the Fraunhofer IBP in Munich in December 2024 and February 2025, the European reference institute for building acoustics. The 12334 series of tests covers 14 different door and partition configurations, with build-ups ranging from standard MDF to double acoustic laminated glass. The results are published and available on request.
Vitralux installs the quint-it qi2 system across Luxembourg for conference rooms, executive offices, medical practices, confidential meeting rooms and every space where certified sound insulation is a functional requirement rather than a passing wish. The system can be dismantled in full and reused.
The 14 certified figures — Fraunhofer IBP Munich 2024-2025
Every figure below comes from the official Fraunhofer IBP tests, series 12334, carried out in December 2024 (tests 1-19) and February 2025 (tests 20-26). Test rig size: door = 2 m², partition = 10.7 m². The ► symbol marks the best figure in each configuration.
DOOR configuration — qi2-Wand tests (door within the partition)
| Glass build-up | Notes | Rw (dB) | Test / Year |
|---|---|---|---|
| 2× 12 mm MDF + 50 mm wood fibre | Continuous profiles | 43.3 | S 12334-05 / 2024 |
| 2× 12 mm MDF + 1× 10 mm plasterboard + 40 mm fibre | Continuous profiles | 47.7 | S 12334-06 / 2024 |
| 2× 12 mm MDF + 2× 10 mm plasterboard + 30 mm fibre | Continuous profiles | 49.3 | S 12334-07 / 2024 |
| 1× 12.5 mm acoustic VSG + 1× 12.76 mm standard VSG | 0.5 mm SI interlayer + cont. profiles + taped joints | 48.4 | S 12334-19 / 2024 |
| 2× 12.5 mm acoustic VSG | 0.5 mm SI interlayer + cont. profiles + taped joints | ► 51.6 | S 12334-18 / 2024 |
DOOR configuration — qi2-Tür tests (door within the door)
| Glass build-up | Notes | Rw (dB) | Test / Year |
|---|---|---|---|
| 2× 12 mm MDF + 50 mm wood fibre | 2× door bottom seal | 41.3 | S 12334-14 / 2024 |
| 2× 12 mm MDF + 1× 10 mm plasterboard + 40 mm fibre | 2× door bottom seal | 43.0 | S 12334-15 / 2024 |
| 2× 12 mm MDF + 2× 10 mm plasterboard + 30 mm fibre | 2× door bottom seal | 44.0 | S 12334-16 / 2024 |
| 2× 12.5 mm acoustic VSG | 0.5 mm SI interlayer + 2× door bottom seal | ► 45.6 | S 12334-13 / 2024 |
| 2× 12.5 mm acoustic VSG | 0.5 mm SI interlayer + 2× bottom seal + 4 mm carpet | 40.8 | S 12334-11 / 2024 |
PARTITION configuration — qi2-V12 tests
| Glass build-up | Notes | Rw (dB) | Test / Year |
|---|---|---|---|
| 2× 12.76 mm standard VSG | 0.76 mm PVB + bonded glass joints + cont. profiles | 43.8 | S 12334-22 / 2025 |
| 1× 12.76 mm standard VSG + 1× 12.5 mm acoustic VSG | 0.76 mm PVB + 0.5 mm SI | 45.0 | S 12334-23 / 2025 |
| 2× 12.5 mm acoustic VSG | 0.5 mm SI | 46.3 | S 12334-24 / 2025 |
| 2× 12.5 mm acoustic VSG | 0.5 mm SI + 2× qi2 module + clamping profiles | ► 49.0 | S 12334-26 / 2025 |
Certified acoustic documentation for quint-it qi2
The full test report of the Fraunhofer IBP measurements (series 12334) is available on request to clients, architects and inspection bodies — ask us for the acoustic documentation. Product information on the manufacturer's site: quint-it.de.
Which spaces call for a certified acoustic glass partition?
Conference room
The most sensitive space of all acoustically: meetings must be inaudible from the open-plan floor. An Rw of at least 45 dB is generally needed for satisfactory confidentiality. The quint-it qi2 reaches 49 to 51.6 dB depending on the configuration.
Executive office
Confidentiality for telephone calls and strategic conversations. The glass partition gives you the transparency and the sightlines you want while guaranteeing enough sound insulation.
Medical or therapy practice
Confidentiality during consultations is a legal obligation in many settings. A certified acoustic partition meets that requirement while keeping the space open and full of light.
Creative space / focus room
Concentrated work needs shielding from outside noise. The acoustic glass partition delivers both: quiet to work in and a visual connection with the open-plan floor.
Reception area
It keeps conversations at the desk away from the noise of the open-plan floor while preserving visibility and access. Frosted or clear glass keeps the open layout intact.
Recording studio or training room
Where maximum sound insulation is called for, the double acoustic laminated build-up reaches 49 to 51.6 dB — comparable to a standard blockwork partition.
The four factors that decide how a glass partition performs acoustically
The mass of the glass
The heavier and thicker the glass, the more sound energy it absorbs. That is why the acoustic laminated build-ups (2× 12.5 mm) reach the best figures: the 0.5 mm SI acoustic interlayer between the two panes dissipates the mechanical energy of the sound waves.
The perimeter seals
Sound travels through gaps just as readily as through the glass itself. The quint-it qi2 system uses special seals right around every panel and every door. Taping the profile joints is a key step in the installation.
The door bottom seal
The door is the acoustic weak point of any partition. The qi2 system has double bottom seals that compress against the floor as the door closes, shutting the gap underneath it.
The profiles and the assembly
The post profiles of the qi2 system are designed to avoid acoustic bridges: structure-borne transmission (sound travelling through the framework) is kept to a minimum by the damping materials built into the profiles.
Technical note
Taping every profile joint is essential if the certified figures are to be reached. Vitralux carries out that step meticulously during installation.
quint-it qi2 Acoustic Partition — specification
| System | quint-it Deutschland GmbH — qi2 system (double glazing) |
|---|---|
| Manufacturer's site | www.quint-it.de |
| Acoustic principle | Double acoustic laminated glass + perimeter seals + door bottom seal |
| Maximum door figure | Rw = 51.6 dB — test S 12334-18 (qi2-Wand, 2× 12.5 mm acoustic VSG) |
| Maximum partition figure | Rw = 49 dB — test S 12334-26 (qi2-V12, 2× acoustic VSG + modules) |
| Certifying institute | Fraunhofer IBP Munich — series 12334 — Dec. 2024 / Feb. 2025 |
| Acoustic glass | 12.5 mm acoustic VSG (0.5 mm SI interlayer) · 12.76 mm standard VSG (0.76 mm PVB) |
| Minimum glass build-up | 2× acoustic VSG to reach the best figures |
| Door bottom seal | Double integrated compression seal — essential on acoustic doors |
| Taping | Taping of every profile joint — a key step in the installation |
| Demountable | Yes — modular system, fully recoverable |
| Documentation | Fraunhofer IBP report, series 12334, available on request |
Your questions about the quint-it qi2 acoustic partition
Rw is the weighted sound reduction index, measured to EN ISO 717-1. A wall with Rw = 40 dB cuts the perceived sound by a factor of 100. An Rw of 51.6 dB means that a normal conversation at 65 dB on the other side of the partition arrives at around 13 dB — a whisper you can barely hear. For comparison, a good 10 cm blockwork wall reaches roughly 45 to 50 dB.
Yes. Acoustic laminated glass is available clear. Transparency has no bearing on the acoustic performance: it is the make-up of the glass (double laminated with an SI acoustic interlayer) that decides the insulation, not how it looks. Frosted versions (Satinato) are available too, for spaces where visual privacy is wanted alongside acoustic privacy.
For a standard office conference room we recommend the qi2-Wand door with 2× acoustic VSG (Rw = 51.6 dB) or the qi2-Tür door with 2× acoustic VSG (Rw = 45.6 dB) for the door, and the qi2-V12 partition with 2× acoustic VSG plus modules (Rw = 49 dB) for the partition itself. Vitralux settles the optimum configuration during the technical site visit, in line with your particular requirements.
Sound is a physical phenomenon and it always finds the path of least resistance. Even with very high-performance acoustic glass, the smallest gaps between profiles create acoustic short circuits that degrade the overall insulation considerably. Taping every profile joint is the step that turns a decent partition into a certified one. Vitralux carries it out rigorously.
Yes. The Fraunhofer IBP test documentation for series 12334 is available from Vitralux on request. It can be passed on to clients, acoustic inspection bodies, structural engineers and architects who want the performance of the system confirmed. It includes the exact test references (file numbers S 12334-xx) and the test conditions.
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