{"id":10076,"date":"2024-06-21T00:00:00","date_gmt":"2024-06-20T23:00:00","guid":{"rendered":"https:\/\/sasintgroup.com\/blog\/sound-absorption-coefficient-explained\/"},"modified":"2026-08-26T17:12:05","modified_gmt":"2026-08-26T16:12:05","slug":"sound-absorption-coefficient-explained","status":"publish","type":"post","link":"https:\/\/sasintgroup.com\/en-us\/blog\/sound-absorption-coefficient-explained\/","title":{"rendered":"Sound Absorption Coefficient Explained"},"content":{"rendered":"\n
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Sound Absorption Coefficient Explained<\/h2>\n \n

When it comes to the materials used to absorb acoustic energy, which is essentially reducing sound, you want to be able to refer to something that clearly shows how well it\u2019s able to do this. This is where sound absorption coefficient comes in; you\u2019ll often find it mentioned alongside soundproofing materials used for walls, ceilings, and even flooring materials, usually for communal spaces such as offices, transport hubs, and schools.<\/p>\n \n <\/div>\n\n

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Architects, interior designers, musicians, and even students may find themselves coming across references to sound absorption coefficient, so this blog will serve as a guide to understanding this term, and why it matters.<\/p>\n

Sound absorption stops a sound wave in its tracks, interrupting its travel through the air and absorbing it into a dense material. A sound wave is transmitted, and while part of it is reflected by the material and part of it passes through it, the rest of the material has the sound wave transferred to it.<\/p>\n

Materials with good sound absorption are vital in spaces that are prone to inviting a lot of noise – usually ones that will see lots of people gather together, such as offices, and public spaces like stations, libraries, hotels, places of worship, museums, galleries, concert halls, and theaters. They can also be useful within homes, to ensure peace and quiet both inside and out.<\/p>\n

There are several materials known for their sound-absorption properties; the most common examples include:<\/p>\n

Acoustic foam: Available in various shapes, such as wedges to properly get into those nooks and crannies, acoustic foam is generally made from polyurethane.<\/p>\n

Mineral wool: Commonly used within ceilings, walls, and floors, mineral wool isn\u2019t just good at absorbing sound, it\u2019s a dab hand at keeping you warm, too, with good thermal credentials.<\/p>\n

Fibreglass: This stuff is lightweight and good at absorbing sound waves of varying frequencies, making it a versatile material for sound absorption; you\u2019ll often find it within acoustic panels, as well as insulation.<\/p>\n

Understanding sound absorption coefficient<\/p>\n

Sound absorption coefficient, which, as we\u2019ve alluded to, is used to rate the efficiency of a material at absorbing sound, is the ratio of absorbed energy to incident energy. It\u2019s represented by \u03b1. For example, if a material can fully absorb acoustic energy (or soundwaves, in other words), then \u03b1 = 1.<\/p>\n

The sound absorption abilities of materials will be changed by different frequencies. This means that some materials absorb certain sounds better than others, and to show this, sound absorption coefficient frequency curves are used. However, these can be a little complicated to compare. Instead, the average sound absorption coefficients are often used, which is the average value of a material\u2019s absorption at various frequencies.<\/p>\n

The ability of a certain material to absorb sound is described by sound absorption A; this is calculated by multiplying the surface area of the material by its sound absorption coefficient.<\/p>\n

The surface area and sound absorption coefficient of the ith wall are represented by si and \u03b1i, respectively.<\/p>\n

The transmission coefficient, shown as \u03c4, is the ratio of energy that passes through a material to the energy that hits it. In engineering, the ability of a material or building element to block sound is measured by the sound reduction index, also known as sound transmission loss (STL). This is expressed in decibels, which is a term you\u2019re more likely to recognize.<\/p>\n

How is sound absorption coefficient measured?<\/p>\n

So, how exactly do we reach the numbers required to complete those equations? Well, this is generally done in one of two ways: the reverberation method, and the impedance tube method; allow us to explain\u2026<\/p>\n

The reverberation method involves calculating the sound absorption coefficient using reverberation time measurements; this is because reverberation time is \u2018inversely proportional\u2019 to absorption; this means that the better sound absorption is, the lower the reverberation time. In order to measure how good a material is at absorbing sound; the reverberation time is measured – this means we\u2019ll find out how long a sound lingers – within a room both with and without the chosen material. From here, the sound absorption the material is capable of can be calculated.<\/p>\n

To measure sound absorption coefficient using the impedance tube method, the material being tested is placed at one end of a tube. Sound waves are then sent through the tube, and by cleverly measuring the difference between the highest and the lowest pressure points in the tube, and comparing the incoming and reflected sound waves, the sound absorption properties of the material can be calculated.<\/p>\n

Factors that affect sound absorption coefficient<\/p>\n

Of course, there are a number of factors that play a part in the efficiency of a material at absorbing sound. These include:<\/p>\n

This is an obvious one; the makeup of the material you\u2019re testing will greatly impact its sound absorption coefficient, which includes its thickness, density, and surface finish. Not every thick, dense material is going to absorb sound, though. For example, concrete would reflect sound, not absorb it.<\/p>\n

As we\u2019ve alluded to, sound absorption has a lot to do with different sound wave frequencies; not all soundwaves are the same frequency – far from it! How well a material absorbs sound depends on how heavy it is for its size – in other words, its mass density. Take a porous material, for example; if it gets denser, it will absorb low-frequency sounds better than high-frequency sounds.<\/p>\n

Temperature, humidity, and location are all environmental factors that can influence measurements of sound absorption coefficient.<\/p>\n

To appreciate good sound absorption coefficients, we should talk about the kinds of places that such materials should be considered and installed. Below are the main areas in which you\u2019d expect acoustics to play a role, and therefore where you could find materials with sound absorption coefficient measurements.<\/p>\n

There\u2019s no doubt about it, acoustics within buildings matter; from large public spaces, to offices, and even our homes. Take theaters, concert halls, and auditoriums for example; you know that hush you get when you walk in before the show has started, despite all the people making their way to their seats? It\u2019s all to do with sound absorption. You\u2019ll find that a mixture of sound absorbent and reflective surfaces are employed in accordance with the room\u2019s shape, so when performers are on stage, the sound reaches the audience in the best way possible, without echoes.<\/p>\n

The same applies for homes, offices, and libraries; architectural acoustics are used to keep any sound in the place it’s made, so it doesn\u2019t travel and disturb others. This could be in flooring, wall coverings, ceilings, and even furniture. No one likes to hear loud neighbours, whether they live next door to you, or sit close to you at work!<\/p>\n

Industrial spaces, such as factories, can be a noisy business, which is why acoustic measures need to be taken to control noise levels. This is to protect employee health more than anything; there are plenty of Health and Safety Executive stipulated regulations around what is and isn\u2019t tolerable for employees to work in, and when an employer should provide hearing protection. You may find partitions, acoustic ceilings, and acoustic wall coverings are all fitted to protect the hearing of those working within noisy industrial environments.<\/p>\n

Carpets, curtains, and furniture designed with sound absorption in mind are all available to buy, all designed to make everyday living noise less of a disturbance to others, whether they live in the same property, or just nearby. If you\u2019ve ever been the downstairs neighbour in a block of flats, you\u2019ll appreciate what a godsend in sound absorption a layer of carpet can be!<\/p>\n

How to choose the right materials for sound absorption<\/p>\n

Believe it or not, there\u2019s quite a lot that goes into choosing the right sound absorption for your space. The way you decide on the criteria you use may require you to explore the following:<\/p>\n

Identify the type of noise<\/p>\n

Higher frequency noise, such as people\u2019s voices, will require a different approach than low frequency noises, such as music with heavy bass.<\/p>\n

The shape and size of the room will need to be carefully considered, as well as its purpose. What may work well for a 6-person office will likely not work for a 5,000 capacity theatre.<\/p>\n

The properties of the materials themselves<\/p>\n

It\u2019s important to familiarise yourself with the definitions of words such as density and porosity . The denser the material, the better it is at absorbing lower frequencies, while lighter ones absorb high frequencies more effectively. Porous materials are, in general, better at absorbing sound full stop.<\/p>\n

Ceilings are a great example here; don\u2019t underestimate the power of ceiling design. The good news is that opting for an acoustic ceiling doesn\u2019t mean you need to compromise on it. Think hard about the kind of transformation your ceiling can achieve for you, and explore materials that not only effectively absorb the sounds within the space, but that will achieve the look you\u2019re going for, too.<\/p>\n

Who will be installing your sound absorbent materials, and what would suit the speed you need the project to move at? Some materials are easier to install than others, so consider whether you need materials that can be easily applied to walls or ceilings yourself (such as acoustic foam), or if you require a little help from the professionals.<\/p>\n

With sustainability now a pressing matter that few can ignore, chances are you\u2019ll want to opt for eco-friendly materials if you can. If they fit the sound absorption you need, recycled cotton or cork are good choices for environmentally conscious projects.<\/p>\n

Of course, budget plays a part in any project. Some high-performance materials can be expensive, so consider the best option within your price range.<\/p>\n

Future trends in sound absorption<\/p>\n

In our opinion, the main trend within the world of sound absorption is undoubtable sustainability; as we all strive for ways to achieve what we need to without harming the planet, much research is being done into how sustainable materials can absorb sound. The likes of bio-based polymers, natural fibres, recycled materials, porous metals, new composites, and smart materials are all being explored by sound scientists. As experts in the world of acoustic building materials, we\u2019re excited to see what\u2019s made available for use within projects.<\/p>\n

Choose SAS for acoustic ceiling and wall panels<\/p>\n

You might have guessed by now that when it comes to the acoustics of a room, SAS are the leaders in our industry; our acoustic ceiling products absorb sound using an open-cell porous material, which is faced with a perforated metal sheet. Whereas the majority of ceiling tiles rely entirely on the porous material behind the perforated metal to absorb the sound, our micro-perforated tiles are the exception.<\/p>\n

As acoustic experts, we\u2019ve developed a range of ceiling products, which range from suspended metal ceilings to baffles, ceiling rafts, nodal ceilings and more. Our experienced team pride themselves on creating totally bespoke acoustic solutions for any space, taking its purpose and shape into consideration, as well as your design vision and, of course, budget.<\/p>\n

Every SAS client benefits from our unique design expertise, high quality manufacturing capabilities, and product integrity, as well as our specialist acoustic guidance. This includes advice on acceptable levels of acoustic privacy, reverberance, and the acoustic characteristics of various types of spaces. We\u2019re confident in delivery exemplary acoustic solutions, with awards and accreditations to our name to bolster our knowledge, experience, and passion for transforming spaces through design that performs.<\/p>\n

To learn more about the science of acoustics and its application within buildings, review our products’ acoustic performance as well as our attenuation and absorption statements , contact us today to discuss the acoustic requirements for your project.<\/p>\n <\/div>\n <\/div>\n \n <\/div>\n <\/div>\n <\/div>\n\n<\/section>\n","protected":false},"excerpt":{"rendered":"

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