What is the EN standard for sound absorbers and technical textiles?

How can you be sure that a sound absorber delivers what it promises? Or that a technical textile material really meets the safety requirements needed in public environments and construction projects? The answer lies in the European EN standards – a common system of rules, test methods, and classifications that ensure quality, safety, and performance. Yet these standards are often a jungle to interpret, especially when it comes to acoustic products and textiles with sound-absorbing properties. In this article, we clarify the concepts and explain what the most important EN standards actually mean in practice.

EN standards (European Norms) are used throughout the EU to create uniform requirements for products regardless of manufacturer or country. For sound absorbers and technical textiles, these standards can cover everything from sound absorption classification (EN ISO 354 and EN ISO 11654) to fire reaction and fire safety (EN 13501-1) and emissions of particles or chemicals. By understanding these designations, architects, designers, and purchasers can make informed decisions and ensure that the material meets both functional and safety requirements.

For acoustic solutions used in schools, offices, or public buildings, standards are crucial. They govern how materials are tested in laboratory environments, how their sound-absorbing capacity is measured, and how the results should be interpreted. This means that a product with a high sound absorption class not only reduces reverberation—it also has documented, tested properties according to a method that makes the results comparable between different manufacturers. This creates transparency, quality assurance, and fair comparisons in the market.

When it comes to technical textiles, properties such as durability, wear resistance, flame resistance, and air permeability also play a central role. Standards such as EN ISO 9237 (air permeability) and EN ISO 12947 (Martindale abrasion resistance) are common references in product descriptions, but their actual significance is often misunderstood. These tests provide an objective picture of how the textile behaves during prolonged use – something that is crucial in environments with high demands on both aesthetics and function, such as hotels, schools, and workplaces.

In this article, we review the most common EN standards in sound absorption and technical textiles, and explain how they are used to assess everything from acoustic performance to fire safety and environmental impact. You will get a clear overview of how the standards interact, why they are important, and how SilentDirect works to meet and exceed these requirements in its products. By understanding the basics of EN standards, you can make better material choices, ensure the quality of your projects, and create sound environments that are safe, sustainable, and proven effective.

EN standards for sound absorbers and technical textiles – a basic guide

How can you be sure that a sound absorber delivers what it promises, or that a technical textile meets the requirements of professional environments? The answer lies in the European EN standards – a common system of test methods and assessment criteria that ensures products are tested on equal terms. For those working in architecture, interior design, construction, or acoustic planning, these standards are a guarantee of quality, safety, and comparability.

This guide provides a basic but in-depth understanding of the most important EN standards used in sound absorbers and technical textiles. We explain what they mean, how they are measured, and why they are crucial for creating safe, functional, and sustainable sound environments.

What does an EN standard mean?

EN stands for European Norm and is the official designation for harmonized standards within the EU. The purpose is to create a common basis for testing, safety, and performance so that products from different manufacturers can be compared fairly. When a product is tested according to an EN standard, it means that it has undergone a carefully regulated process with documented measurement results.

For building and interior materials, such as sound absorbers and textiles, these standards play a central role. They make it possible to assess sound absorption capacity, fire behavior, air permeability, durability, and environmental impact in an objective manner. This creates a common quality assurance throughout Europe and is often a requirement in public procurement.

Important EN standards for sound absorbers

EN ISO 354 – Measurement of sound absorption in reverberation rooms
This standard is used to measure how much sound is absorbed by a material. The test is carried out in a reverberation room where the time it takes for the sound to decay by 60 dB is measured. The result is presented as an absorption coefficient (α) that varies between 0.0 and 1.0, where 1.0 means full absorption. The test forms the basis for classification according to EN ISO 11654.

EN ISO 11654 – Classification of sound absorbers
This standard compiles the results from EN ISO 354 and places the product in an absorption class: A, B, C, D, or E. Class A corresponds to very high sound absorption, while class E means low. The classification is based on average values across several frequencies and makes it easy to compare acoustic products between manufacturers.

EN ISO 717-1 and EN ISO 10140 – Airborne sound insulation
These standards are used to measure how well building products, walls, and systems insulate sound between rooms. In some cases, sound absorbers can also be tested according to these methods if they are part of building systems or acoustic wall panels. The result is given as an Rw value (dB), which indicates the reduction in sound transmission.

EN 13501-1 – Fire classification of building products
One of the most critical standards for acoustic products. It specifies how a material reacts in the event of fire and how much smoke and droplets are formed. Classes A1 and A2 are non-combustible, while B–E indicate different levels of combustibility. Public environments often require A2-s1,d0 or better. This standard is crucial for safety in schools, offices, and meeting rooms.

Additional test methods and supplementary markings

In addition to the major acoustic standards, supplementary measurement methods are also used to ensure quality and durability over time:

• EN ISO 354 + EN ISO 11654: Measures and classifies sound absorption.
• EN 13964: Regulates suspended ceiling systems that include sound absorbers as a component.
• EN ISO 140-3: Assesses sound insulation in building components such as wall panels.
• EN ISO 11925-2: Complementary test for fire ignition on small test pieces, often used in conjunction with EN 13501-1.

Together, these standards provide a clear technical framework for how acoustic products should be tested and described. They serve as a common language between manufacturers, architects, and construction companies.

Important EN standards for technical textiles

Technical textiles are often used as surface materials on sound absorbers, curtains, acoustic panels, or furniture upholstery in environments with high demands on both aesthetics and function. To guarantee performance, they are tested according to specific standards that focus on durability, air permeability, and fire safety.

EN ISO 9237 – Air permeability
This standard specifies how much air can pass through a textile material under a certain pressure. This is important for acoustic textiles because air permeability affects sound absorption – a fabric that is too dense can reduce the acoustic efficiency of the material, while a fabric that is too open does not dampen sound sufficiently.

EN ISO 12947 (Martindale test) – Wear resistance and abrasion resistance
The Martindale test measures how many cycles a textile can withstand before the fibers begin to wear. For acoustic panels and public environments, a minimum of 30,000 cycles is often recommended. The higher the value, the better the durability during prolonged use.

EN ISO 1182 and EN ISO 6941 – Fire behavior of textiles
These standards assess how a textile reacts to fire – whether it ignites, how quickly it burns, and whether it drops burning particles. For sound absorbers and curtains, these values are used to meet the requirements of EN 13501-1 and ensure that the material is approved for public environments.

EN ISO 105-B02 and EN ISO 105-E04 – Colour and light fastness
These standards are used to measure how well textiles retain their color when exposed to light and washing. For sound absorbers with fabric-covered surfaces, this is important to ensure long life and visual quality.

Common concepts and terms in acoustics and certification

• α (alpha): Indicates the sound absorption coefficient – how much of the sound is absorbed by the material. 0.0 = no sound is absorbed, 1.0 = all sound is absorbed.
  
• NRC (Noise Reduction Coefficient): An American value that corresponds to the average absorption at four frequencies (250–2000 Hz). Similar to EN ISO 11654.
  
• RT60 (Reverberation Time): The time it takes for the sound level to drop by 60 dB. Shorter reverberation time means better acoustic comfort.
  
• Rw value: Indicates how much sound insulation a system provides, measured in decibels.
  
• Reaction to Fire: Measures how materials behave in a fire (how quickly they ignite and how much smoke they emit) – a key part of EN 13501-1.
  
  

Why EN standards are crucial

EN standards are more than technical documents – they are the basis for trust between manufacturers, architects, and users. They make it possible to compare products on equal terms and ensure that quality is maintained throughout the entire life cycle. For construction and interior design projects, this means reduced risk, better performance, and compliance with regulatory requirements.

For sound absorbers and technical textiles, the standards are particularly important because they combine several aspects: acoustics, safety, aesthetics, and sustainability. By choosing products that are tested according to EN ISO 354, EN 11654, and EN 13501-1, you can be sure that the solution works as it should – both acoustically and in terms of safety.

SilentDirect's work with certified materials

SilentDirect develops and supplies acoustic solutions that are tested according to the relevant EN standards. Our products, such as SilentDirectPES/PES Fabric and other products in the SilentDirect brand, meet the requirements for sound absorption, fire safety, and durability. By combining documented technology with design adaptation, we create solutions that meet both building standards and aesthetic requirements.

With the right knowledge of standards and labels, you as a client, architect, or project manager can make informed choices. EN standards are more than just numbers—they are a guarantee that the sound environment you create is safe, functional, and sustainable in the long term.

EN standards & certifications – in-depth guide to sound absorbers and technical textiles

Here you will find an in-depth guide that provides a clear and detailed understanding of the aforementioned EN standards. We go through each term, classification, and test method step by step to give you a clearer picture of what they mean in practice and how they affect quality, safety, and performance.

1. Acoustic performance – measurement, classification, and interpretation

EN ISO 354 – Measurement of sound absorption in reverberation rooms

What is measured: How much of the incident sound energy is absorbed by a material or system.
Method: The material is placed in a reverberation chamber; the difference in reverberation time (RT) with and without the sample is measured.
Output: Absorption coefficient α(f) per frequency band (0.00–1.00).
Note: The result is affected by sample size, mounting, and air gap.

EN ISO 11654 – Classification of sound absorbers

Compiles the results from EN ISO 354 into a practical absorption coefficient (αp) in 1/1 octaves (250–4000 Hz) and a summary class (A–E).
Class A = very high absorption, Class E = low.
The suffixes L/M/H indicate a focus on low, medium, or high frequencies.

Installation conditions

Types A–E indicate installation: direct wall mounting, air gap, baffles, etc. An air gap increases absorption at low frequencies.

NRC & SAA

Non-European measurement systems. NRC (four octaves) and SAA (multi-band) are used in the USA. Cannot be directly compared with αw according to EN 11654.

2. Sound insulation – when the absorber is part of the system

EN ISO 10140 & EN ISO 717-1

Measures airborne sound insulation in a laboratory. The result is expressed as Rw (dB) and spectrum adaptations C/Ctr. Relevant for wall and room partition constructions.

EN ISO 16283 & EN ISO 717-1

Field measurement of DnT,w /_R’w for finished rooms. Field values are usually lower than lab values.

3. Fire and safety

EN 13501-1 – Fire classification of construction products

Classification: A1, A2, B, C, D, E, F with smoke (s1–s3) and dripping (d0–d2).
Example: A2-s1,d0 = very limited flammability, low smoke, no dripping.
Source tests: EN 13823 (SBI) and EN ISO 11925-2 (flammability).
Public environments often require A2-s1,d0 or B-s1,d0.

Textile flame retardants

EN 13773 (class 1–5) is sometimes used for curtains and drapes. Often supplemented with EN 13501-1 when the textile is included in building components.

4. Technical textiles – durability and function

EN ISO 9237 – Air permeability

Specifies how much air passes through a fabric. For dense weaves, absorption is reduced; for open weaves, attenuation may be reduced in certain bands. Balance is crucial.

EN ISO 12947 – Martindale test

Measures wear resistance. ≥30,000 cycles are recommended for public environments and acoustic textiles.

EN ISO 1182 & EN ISO 6941 – Fire behavior of textiles

Assesses ignition, burning rate, and dripping. Used in conjunction with EN 13501-1 to verify safety.

EN ISO 105-B02 & EN ISO 105-E04 – Colour and light fastness

Tests color fastness to light and washing. Important for fabric-covered panels in public environments.

Emissions and indoor environment

EN 16516 and the ISO 16000 series measure VOC and formaldehyde emissions. Third-party labels such as OEKO-TEX®, EU Ecolabel, and GREENGUARD complement these standards.

5. Material physics and acoustic concepts

• Air flow resistance (σ, ISO 9053-1/-2): determines the frequency range of the damping.
• Porosity and tortuosity: affect how sound waves penetrate the material.
• Thickness and density: greater thickness and air gap improve low-frequency absorption.
• RT60 (EN ISO 3382-2): reverberation time, central design target.
  
  

6. Product standards and CE marking

EN 13964 applies to suspended ceiling systems that include absorbers and enables CE marking under the Construction Products Regulation (CPR).
The manufacturer must submit a DoP (Declaration of Performance) with performance according to EN ISO 11654, EN 13501-1, and EN 16516.
Tests must be performed by accredited laboratories (ISO/IEC 17025).

7. How to read a test report

1. Check that the test lab is accredited and that the correct standard is used.
2. Review the sample's assembly, thickness, and air gap.
3. See the frequency data in 1/3 octaves.
4. Read both αw and the absorption curve (A–E, L/M/H).
5. Check the fire class designation, e.g. B-s1,d0.
6. Verify the report number, date, and traceability.

8. Common pitfalls

• Only reading the class designation – study the entire curve.
• Ignoring installation conditions or air gaps.
• Mixing NRC/SAA with αw without specifying the system.
• Using too dense a fabric that impairs absorption.
• Incorrect fire classification can halt projects.
  
  

9. Design order

1. Define objectives: RT60, sound levels, fire, emissions.
2. Select category: ceiling, wall, baffles, screens.
3. Filter products according to relevant EN standards.
4. Optimize with thickness, air gap, and textile permeability.
5. Request test reports and fire certificates.
6. Plan field measurements if necessary (ISO 16283/3382).

10. Glossary

• α(f)/αp/αw: absorption coefficient (frequency-dependent, practical, summary).
• NRC/SAA: American average values for absorption.
• RT60: reverberation time.
• Rw / DnT,w: airborne sound insulation (lab/field).
• A2-s1,d0: fire class designation.
• σ: airflow resistivity.
• DoP/CE: Declaration of Performance and CE marking according to CPR.
  
  

Conclusion

Understanding how EN standards measure, classify, and verify performance is key to choosing the right materials. When you link test data to room acoustic targets, you get solutions that work in real life—safe, traceable, and effective. By choosing products that meet relevant standards, you get both quality and peace of mind—documented, tested, and verified.

The benefits of using classified products – safety, quality, and long-term performance

At a time when the market is flooded with different materials, suppliers, and manufacturing methods, it has become more important than ever to choose classified and certified products. When a product is tested according to an established standard, such as EN or ISO standards, it means that it meets clearly defined requirements for performance, safety, and durability. This is not just a technical formality—it is a guarantee of quality, responsibility, and long-term functionality.

1. Safety and reliability

Products classified according to EN standards have undergone rigorous testing in accredited laboratories. This means that their properties are not based on estimates, but on measurable results. For sound absorbers, acoustic panels, or technical textiles, this covers everything from fire classification (EN 13501-1) to sound absorption (EN ISO 11654). By choosing classified products, you can be confident that the material will perform as expected – even in demanding environments.

2. Comparability between products

One of the biggest advantages of classification is transparency. When products are tested according to the same standard, their performance can be compared fairly, regardless of the manufacturer. A Class A sound absorber means the same thing in Sweden as it does in Germany or France. This makes it easier for architects, project managers, and purchasers to make informed decisions and ensure that the selected materials meet the requirements of the project.

3. Documented quality and traceability

Classified products are always delivered with test reports, certificates, and clear documentation. This means that both manufacturers and users can trace the product's properties back to approved testing institutes. This not only strengthens the product's credibility, but also facilitates public procurement, environmental certification (e.g., BREEAM, LEED), and building permit processes.

4. Increased service life and better overall economy

Products that meet standardized requirements have been shown to last longer and perform more consistently over time. For sound-absorbing materials, this means stable acoustic performance even after many years of use. For textile surface layers, it means color and wear resistance that is maintained throughout the product's lifetime. The initial investment in a classified product pays off in the form of reduced maintenance, fewer replacements, and longer technical life.

5. Fire safety and healthy environments

Many EN standards are not only about performance but also about health and safety. For example, EN 13501-1 ensures that products meet fire requirements, while EN ISO 16000 can be used to measure emissions of particles and chemicals. For public buildings, schools, and offices, this is crucial for creating safe and healthy environments for everyone who spends time there.

6. Sustainability and environmental responsibility

Classified products are often also tested from an environmental and sustainability perspective. Standardized testing methods ensure that materials do not contain harmful substances and that they can be recycled or reused. For companies working with sustainability goals or environmental certification, there is a clear advantage in choosing products that are already verified according to common standards.

7. Improved trust and professional credibility

Using and recommending classified products strengthens your brand and signals professional competence. It shows that you, as a supplier, architect, or builder, work with materials that are tested, traceable, and meet applicable European requirements. In an industry where quality and safety are paramount, classification is a powerful way to build trust—both with customers and partners.

Summary – why you should choose classified products

Choosing products that are tested and classified according to EN standards is not just about meeting formal requirements – it's about creating value, security, and long-term quality. You get documented performance, comparability between suppliers, and the assurance that each component fulfills its technical and safety promises. For those who work with acoustics, interior design, or construction

Did you know that...

...a product may look identical on the surface, but perform completely differently depending on whether it is classified or not? Two sound absorbers with the same thickness, color, and price can differ by up to 70% in actual sound reduction. It's not magic – it's standardization! EN classifications reveal what lies beneath the surface and show which products really deliver what they promise.

It may sound incredible, but a product that lacks a fire rating according to EN 13501-1 can in practice start to glow at just 250 °C – while a classified equivalent in A2-s1,d0 can withstand over 800 °C without spreading flames or smoke. The difference is literally life-saving. And yet few people know what these small letter combinations actually mean.

Another example: EN ISO 11654 – the standard that determines how well a material absorbs sound. A class A sound absorber can reduce the reverberation time in a room by up to 60%, while an untested variant may only make a marginal difference. Despite this, many people choose materials based on color and price – not performance. Did you know that?

Behind every classification lie thousands of hours of research, testing, and documentation. Every number and every letter in the standards is proof that the product has been measured, verified, and confirmed —not just marketed. That's the difference between a product that works on paper and one that delivers in reality.

So next time you see a designation such as EN 13501-1 or EN ISO 354 on a sound absorber or textile, remember that these are not just technical terms. They are the code language for safety, quality, and credibility. A small label, but one with enormous significance for how your room sounds, feels, and protects.