Most workplaces are quite noisy. Sometimes the sounds are so loud that the noise level exceeds the 130 dB mark, which is almost as loud as a plane taking off.
It is therefore essential to protect against hearing damage in the workplace, as it is irreversible once it occurs.
What are the risks of hearing damage?
Damage to your hearing caused by loud noises can happen faster than you think. Many people think they can work near noisy machinery without wearing hearing protection or they believe it's okay to take off their hearing protection for five minutes as they're wearing it all day anyway. But protection from hearing damage wears off much faster than you think:
- Wearing hearing protection 100% of the time will provide the required protection
- Wearing it for 99% of the time (not wearing protection for even five minutes) significantly reduces the level of protection
- 90% of use no longer offers protection
This means that not wearing hearing protection even for a for a very short time increases the risk of hearing damage! It’s important that you are not exposed to noise for too long.
How long is acceptable depends on the sound pressure (dB(A)). This table shows the maximum exposure to noise at different sound pressure levels:
| noise level in dB(A) | Maximum exposure |
|---|---|
| 80 dB(A) | 8 hours |
| 83 dB(A) | 4 hours |
| 86 dB(A) | 2 hours |
| 89 dB(A) | 1 hour |
| 92 dB(A) | 30 minutes |
| 95 dB(A) | 15 minutes |
| 98 dB(A) | 7 minutes |
| 101 dB(A) | 3 minutes |
At what point is your hearing damaged?
Hearing damage occurs when the hairs on the cochlea in the inner ear are damaged. This damage is permanent, and will last for the rest of your life.
There are a number of symptoms you’ll experience if you’ve suffered hearing damage. The best known examples are a ringing sound (tinnitus) or hissing sounds. However, if you can no longer hear loud or quiet sounds, there’s a chance that your hearing is damaged. Or if you have difficulties when making a phone call or holding a conversation in a noisy environment.
In addition to these hearing complaints, you may also experience certain medical issues as a result of hearing damage:
- disturbed sleep
- loss of concentration
- tiredness
- headaches
- high blood pressure
What can you do to protect your ears? Simple: wear hearing protection! In a noisy environment, hearing protection is an absolute must to prevent hearing damage. But how do you make the right choice among all the different options available?
What types of hearing protection are available?
There are different types of hearing protection. From simple, inexpensive earplugs to customised hearing protection for an individual wearer.
You may find it difficult to identify your employees' exact requirements. You’ll naturally want them to have the right protective equipment, but you don't want to pay too much unnecessarily. Which is why we have listed all the types of hearing protection below.
Earplugs
Earplugs come in different shapes and attenuation values. Most earplugs consist of a kind of foam. Foam earplugs are usually disposable products, do not cost much and are maintenance free. For relatively little money, you can buy a dispenser with 200 pieces. There are also silicone earplugs that can be washed and reused. Over a longer period of time, these are more economical than disposable ones.
The shape and firmness play an important role when choosing earplugs. These properties influence whether the earplug can be easily inserted into the ear canal and stay in place.
Using earplugs
Earplugs are especially suitable if you work in a warm, humid environment. Or in areas where hygiene is very important, such as in the food industry. Corded earplugs are best suited for this purpose. The cord prevents the earplugs from dropping when processing food.
Earplugs can be inserted or removed from the ear when you enter or leave the area. This is why they are preferable when you need long-term hearing protection.
In some companies, it's even more important to find an earplug quickly if it's fallen out. Metal detectable earplugs are available for this purpose. These have pieces of metal in both the earplug and the cord, and they are often coloured blue.
Benefits
- Good attenuation over a large frequency range
- Comfortable, with no pressure on your ears
- Maintenance-free
Disadvantages
- Sometimes difficult to insert
- Expensive when the disposable type is used
Ear muffs
Apart from earplugs, you can also wear ear muffs to prevent hearing damage. There are a number of types:
Level-dependent
Passive ear muffs dampen the sound due to the material they’re constructed from. The level of hearing protection depends on the sound level. Passive ear muffs are effective for high pitched sounds, such as alarms.
Active ear muffs have a built-in electronic system. This system detects a low noise through a microphone, and amplifies and transmits it to a loudspeaker in the earcup, and vice versa. This helps to control the sound in the ear muff.
External audio input
Radio ear muffs or ear muffs with a connection for a smartphone and Bluetooth dampen ambient noise, but the wearer can still receive signals, music and other messages.
Communication ear muffs also have a walkie-talkie feature. This allows employees to communicate better without the need to remove their hearing protection.
Using ear muffs
Ear muffs can almost always be used, especially at very high sound pressure levels. If you often have to switch between wearing and removing your hearing protection, ear muffs are a better choice than earplugs. There are also special ear muffs for hygienic purposes.
A simple passive ear muff is available for around 20 euros. If you want active ear muffs, these would cost you approximately 60 to 70 euros. The price of communication ear muffs, with all the bells and whistles, starts at 700 euros, but include all the benefits of communication.
Benefits
- They fit everyone
- They provide good noise damping
- Reliable damping data
- Communication is retained
Disadvantages
- Sometimes uncomfortable due to pressure during prolonged use
- Uncomfortable in warm and humid environments
- Difficult to work with in confined spaces
- Maintenance sensitive
- Communication ear muffs especially, are very expensive
Customised hearing protection (otoplastics)
The final option for preventing hearing damage is by wearing customised hearing protection. This is also known as otoplasty. Custom-made hearing protection for a specific wearer is created by making a mould of the ears. When the ear muff plug is produced or 3D-printed, filters are fitted depending on the application or working conditions. There are soft and hard otoplastics. Which one to choose is often a matter of preference.
Benefits
- They have a long lifespan and are therefore very economical in the long term
- Discreet during use
- Easy to insert
- They fit very well and comfortably
Disadvantages
- High purchase price
- Can’t be purchased off-the-shelf; must be made to measure
Conclusion
You certainly don't have to worry about hearing damage, as there are many options to protect yourself. If you need to wear hearing protection for long periods of time or if your budget is limited, you can use earplugs. If you have to put on and take off protection regularly, ear muffs are a better choice. There are passive ear muffs, the cheapest version, and active ear muffs with their own electronic sound control. Do you want a communication solution so you can talk to your employees? Then choose a communication earmuff, which is a little more expensive because of the different technologies. Otoplastics are long-lasting, comfortable and durable, but they have to be custom-made, which means they are less readily available than earmuffs or earplugs.