NITRAS SAFETY | Noise guide

WHEN WORK GETS LOUD, IT BECOMES DANGEROUS

Loud machines, screeching tools, booming production halls – noise is ubiquitous in many work areas. But what we often overlook: Even a permanent exposure of 80 dB(A) can damage hearing. Above 85 dB(A), suitable hearing protection is legally required. The problem: Hearing damage occurs gradually – and is irreversible. Prevention is therefore mandatory.

Whether classic earmuffs, inconspicuous earplugs, or helmet-attachment solutions, the selection is vast. Our new noise guide explains which noise levels are dangerous, how to recognize risks early, and which hearing protection solutions are useful.

dB(A) stands for an A-weighted sound pressure level, meaning the noise level was measured taking into account the sensitivity of the human ear.

the meaning of dB(A) the meaning of dB(A)

THE EN 352 STANDARD

EN 352 sets the requirements for hearing protection – depending on how the product is worn or attached, it is divided into several parts:

Part	Name	Type of use	Suitable for
EN 352-1	Capsule ear protectors (with headband)	Classic capsule models worn over the head	Long and constant work in loud environments
EN 352-2	Hearing protection earplugs	Disposable or reusable earplugs for the ear canal	Frequent switching between loud and quiet environments
EN 352-3	Helmet-mounted earmuffs	For lateral mounting on industrial safety helmets	Combination with industrial safety helmets

To be certified according to EN 352, hearing protection products must meet a variety of technical and functional requirements. The central performance features include:

+ Minimum insulation values (e.g. SNR, HML values)
+ Mechanical strength and temperature resistance
+ Instructions for use and hygiene requirements

There is also a labeling requirement. All products must be provided with clear instructions for use, standard labeling (e.g. EN 352-1:2020) and the required pictograms. This is the only way to ensure that they are used correctly – and provide the protection they promise in practice.

THE EN 352 STANDARD

EN 352 sets the requirements for hearing protection – depending on how the product is worn or attached, it is divided into several parts:

Part	Name	Type of use	Suitable for
EN 352-1	Capsule ear protectors (with headband)	Classic capsule models worn over the head	Long and constant work in loud environments
EN 352-2	Hearing protection earplugs	Disposable or reusable earplugs for the ear canal	Frequent switching between loud and quiet environments
EN 352-3	Helmet-mounted earmuffs	For lateral mounting on industrial safety helmets	Combination with industrial safety helmets

To be certified according to EN 352, hearing protection products must meet a variety of technical and functional requirements. The central performance features include:

+ Minimum insulation values (e.g. SNR, HML values)
+ Mechanical strength and temperature resistance
+ Instructions for use and hygiene requirements

THAT IS WHAT MATTERS IN PRACTICE

Certified hearing protection is only effective if it also fits the environment and the activity. For the protection to work in practice, the following points must be observed:

1. Measure noise exposure at the workplace (e.g. with a sound level meter)

2. Choose a fit: Not every headband or earbud type fits every wearer

3. Compatibility check: Especially for helmet fastenings (EN 352-3). Does the hearing protection fit the helmet and other PPE components?

4. Attention to care and hygiene: Ensure regular cleaning and replacement.

5. Ensure audibility of signals: Too much insulation can muffle acoustic warning signals – an individual risk assessment is required.

find more practical tips here

More information, noise source comparisons, and selection aids in our noise guide.

Noise guide

More tips

More information, noise source comparisons, and selection aids in our noise guide.

Noise guide

CERTIFIED HEARING PROTECTION, SUSTAINABLE HEALTH PROTECTION

Whether EN 352-certified hearing protection or general noise prevention: Knowing the risks allows for targeted action. Our guide helps you identify and reduce noise sources and effectively protect yourself and your employees.

Because: Hearing damage develops gradually, but is irreversible. Those who take precautions in a timely manner not only protect their hearing permanently, but also meet all the legal requirements for occupational safety.