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A curtain cannot block more noise than its mass allows. Enter the specified mass of a curtain: the tool calculates the maximum sound attenuation permitted by physics, under the most favorable conditions. Any figure higher than this limit is physically impossible for that mass.
There's no need to take anything at face value. The mass law is a classic result of building acoustics.
The overall index displayed is obtained by applying the weighting procedure specified in ISO 717-1 to this curve: the reference curve is shifted in 1-dB increments until the sum of the unfavorable deviations across the sixteen bands from 100 to 3,150 Hz reaches 32 dB without exceeding it. The value of the curve shifted to 500 Hz is theRw index. The 5,000-Hz band falls outside this weighting range; it is calculated separately using the same formula.
| Frequency | Theoretical ceiling | Adjusted Reference | Adverse deviation |
|---|
A theoretical limit is not a test result. Only a report from a laboratory accredited under ISO 10140-2 establishes a product’s actual attenuation. The tool indicates what is impossible, not what is achieved.
The simple mass law describes a homogeneous, flexible wall. A multilayer assembly with internal damping can exceed this by a few decibels in certain frequency bands. By a few decibels—not by a factor of three.
A curtain does not seal the opening. Sound travels around the fabric—from the sides, from the top, and through the shutter box. The actual sound insulation experienced by the occupant is consistently lower than the maximum value calculated here.
A specification listing 300 g/m² refers to the fabric alone. The assembled assembly—including linings and blackout material—weighs more. If only the fabric’s weight per square meter is listed, the actual maximum weight of the finished product exceeds the calculated value—but no one can know by how much.
Absorption (ISO 354, ISO 11654) reduces reverberation in a room and is measured by a coefficient α between 0 and 1. Attenuation (ISO 10140-2) reduces the sound that passes through. An α of 0.90 does not represent a 90% reduction and cannot be converted to decibels.
The maximum attenuation, measured over a narrow band in the high frequencies, is always much higher than the overall index. Both are published together, along with the peak frequency—otherwise, the figure cannot be interpreted.
Calibration point—the 4-layer Cotton Silence composite weighs 1.35 kg/m². The mass law predicts an overallRw value of 14 dB and 29.6 dB at 5,000 Hz. Measurements conducted by the Daidalos Peutz laboratory—BELAC-accredited to ISO/IEC 17025 and in accordance with NBN EN ISO 10140-2:2010—yieldRw (C;Ctr) = 14 (−1; −3) dB and a maximum attenuation of 28.2 dB at 5,000 Hz—report A-2020LAB-060-I766-44092_E. Both measured values are at the theoretical upper limit, with the second slightly below it. The model and the measurement agree on both parameters.
Tool published by Cotton Silence (NOKOMIS WEBSTORE, Paris). The calculation is reproducible: the formula and weighting procedure are provided above. Any errors reported to contact@cottonsilence.com will be corrected. — Test Report Registry · Reference Sheet · Evidence File · Technology
The Cotton Silence " soundproof curtain " is designed to offer a simple, quick installation that anyone can do. Thanks to our mounting system, which is engineered to optimize acoustic and thermal performance, you’ll enjoy professional-quality results without any complicated work.
Unlike traditional curtains hung on a rod, our acoustic curtains perform best when installed on a suitable track. This system ensures optimal sealing on the sides and helps reduce sound leaks and heat loss. It's a crucial step to fully experience the sound reduction of up to 24.6 dB.
The installation is designed to be intuitive while still meeting acoustic requirements: the curtain opens at the bottom, multi-layers ventilate properly, and it's positioned optimally to create a shield against outside noise.
Cotton Silence curtains were designed by acoustics professionals with extensive experience in architectural projects. The goal was clear: to create a “true” noise-reducing curtain, one that is truly effective under real-world conditions and not just in a laboratory.
You'll find this expertise in every detail: from the choice of fibers and the design of the patented multi-layer to optimized weight, thermal performance, internal absorption, and reverb reduction.
Every single curtain is made right here in France by professional seamstresses. This local production means you get lasting quality, perfect finishes, and careful attention to the acoustic layers.
Even though they're super effective, our curtains are still stylish, easy to use, come in lots of colors, and work great for both homes and professional spots.
Once you've got it installed, your Cotton Silence curtain works like a real sound and thermal shield. It seriously cuts down on outside noise, reduces echoes in the room, makes it feel warmer, and instantly creates a calmer, cozier space.
With our version for everyone, you get the same awesome technology that architects and pros use, right in your own home – no big renovations or complicated gear needed!
Whether you're looking to insulate a window, a bay window, a door, or any opening, the Cotton Silence system fits right in and promises long-lasting effectiveness. Our video tutorial walks you through it step-by-step for a successful setup in just a few minutes.
If you need a hand, our team can also help you pick the right way to hang it and make sure your setup is compatible.