Ear muffs and ear plugs have a maximum life expectancy as performance degrades over time.

Key points: life expectancy of hearing protection

Ear muffs can last a long time but do not have an unlimited working life.
Generally, life expectancy is between two and five years.
This applies to ear plugs as well as ear muffs.
Employers must have a programme in place to replace them as their life expectancy is reached.
It is important to recognise that the starting date of this five year period is the date of manufacture, not the date you bought them or started using them.

Life expectancy of ear muffs

This will depend on the quality of the ear muffs initially. The more budget ones will often need replacing after two years, while the more premium end of the market will often say five years. For example:

3M’s Peltor ear muffs are at the upper end of the quality range for ear defenders and 3M state a maximum shelf life of five years for the Peltor range.
JSP also give this period of two to five years for their ear defenders.

Not all manufacturers are as open with their performance data and many do not give the shelf life information, but you should take this five year period as a hard limit for all ear defenders / ear muffs unless the manufacturer specifically says otherwise.

Extract from the 3M Peltor user manual stating a five year shelf life — *3M Peltor user instructions stating five year shelf life*

Moldex make the M series of ear muffs and their technical data says the shelf life is unlimited providing they are stored in line with Moldex’s recommendations.

Moldex web page stating an unlimited shelf life for the M4 ear muffs — *Moldex M4 data stating unlimited shelf life*

At the cheaper end of the market specific shelf life data can be harder to find, for example I have not found a specific time limit on the Portwest PW40 ear muffs. They are a perfectly good hearing protector but sit at a budget price and I would expect the life expectancy to be towards the lower end of that two to five year period.

As a summary, if the manufacturer gives no shelf life data take it as between two and five years. If companies such as Moldex say unlimited then you can go with this provided the regular maintenance checks are made and cushions replaced.

Replacing cushions and foam inserts

Employers need to have a system in place to regularly check hearing protection to ensure it remains suitable for use. Typically this means checking the cushions are still soft and not showing signs of creases, cracks or becoming hard.

At the budget end of the market the cushions on the muffs may be glued on and are not replaceable. For these, the entire ear muff will need to be replaced when the cushion starts to get hard or shows signs of creases or cracks, and usually this will be well within this maximum usage window.

For the slightly pricier ear muffs, ‘hygiene kits’ are available which contain user-swappable muff cushions and foam inserts which can then extend the usable life up to that five year limit. Manufacturers may make specific recommendations on how often the cushions should be changed, for example Moldex recommend the cushions are changed every six months for their M series muffs.

Life expectancy of ear plugs

Ear plugs also have a life expectancy and again, this is from the data of manufacture. Over time, the ability of the expanding foam ones to form a good seal will degrade, making them less effective.

Part of the 3M EAR Classic user manual which states a five year shelf life — *EAR Classic user instructions - five year limit*

Again, 3M are good at making this information available and make it clear in their user instructions, such as this from the EAR Classic information, the typical yellow foam ones, where it states a five year life expectancy.

For reusable plugs, the same five year shelf life applies. Using 3M as an example again, they state the reusable EAR Ultrafit plugs have a maximum life of five years from the date of manufacture.

As with the ear muffs, some manufacturers give a specific shelf life, for example:

3M state five years for the EAR Ultrafit and Classic plugs.
Moldex state the Rockets reusable ear plugs as having an unlimited shelf life, but be sure to adhere to their cleaning requirements to achieve this.
Moldex’s disposable Spark Plugs foam hearing protection has a stated life span of four years.

In the absence of manufacturer’s making the shelf-life clear, take the ‘five years from the date of manufacture’ as your limit, but check the specific data for your chosen ear plugs to confirm it is not shorter.

I should stress again that I pick on 3M not because their products have a shorter life expectancy than most, indeed their products are a good premium choice and the Optime range of muffs are excellent for work, but I use them for examples as they are very good at making performance data readily available. JSP’s statements are also consistent with those from 3M.

FAQ: Life expectancy of hearing protection

We bulk-bought hearing protection and have them in a cupboard, can we count the time-limit from the date people started to use them?

No, the life expectancy starts from the date of manufacture which should be on the box. Ear plugs will degrade over time, even in their box, ear muffs can lose some of their headband tension. Avoid bulk-buying and only buy what you will use in the next few months to avoid having stock going out of use before it is actually worn.

If we put new cushions on ear muffs, will they go beyond the stated life expectancy?

No. Replacing the cushions will mean they are more likely to be usable up to the limit of the life expectancy but will not push the ear muffs beyond it. Over time the headband will have less tension making the muffs less effective overall.

Are cheap ear muffs OK to use rather than the pricier ones?

Absolutely, yes. The only issue will be a shorter life expectancy and often the cushions are not replacable, but they are perfectly good to use. You will need to replace them more frequently, but people still lose and damage the more expensive ones so it is a cost/benefit choice to look into.