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These plugs are made of a formable material designed to expand and conform to the shape of each person’s ear canal. Roll the expandable plugs into a thin, crease-free cylinder. Whether you roll plugs with thumb and fingers or across your palm doesn’t matter. What’s critical is the final result—a smooth tube thin enough so that about half the length will fit easily into your ear canal. Some individuals, especially women with small ear canals, have difficulty rolling typical plugs small enough to make them fit. A few manufacturers now offer a small size expandable plug.
Pre-molded plugs are made from silicone, plastic or rubber and are manufactured as either “one-size-fits-most” or are available in several sizes. Many pre-molded plugs are available in sizes for small, medium or large ear canals.
A critical tip about pre-molded plugs is that a person may need a different size plug for each ear. The plugs should seal the ear canal without being uncomfortable. This takes trial and error of the various sizes. Directions for fitting each model of pre-molded plug may differ slightly depending on how many flanges they have and how the tip is shaped. Insert this type of plug by reaching over your head with one hand to pull up on your ear. Then use your other hand to insert the plug with a gentle rocking motion until you have sealed the ear canal.
Advantages of pre-molded plugs are that they are relatively inexpensive, reusable, washable, convenient to carry, and come in a variety of sizes. Nearly everyone can find a plug that will be comfortable and effective. In dirty or dusty environments, you don’t need to handle or roll the tips.
Canal caps often resemble earplugs on a flexible plastic or metal band. The earplug tips of a canal cap may be a formable or pre-molded material. Some have headbands that can be worn over the head, behind the neck or under the chin. Newer models have jointed bands increasing the ability to properly seal the earplug.
The main advantage canal caps offer is convenience. When it’s quiet, employees can leave the band hanging around their necks. They can quickly insert the plug tips when hazardous noise starts again. Some people find the pressure from the bands uncomfortable. Not all canal caps have tips that adequately block all types of noise. Generally, the canal caps tips that resemble stand-alone earplugs seem to block the most noise.
Earmuffs come in many models designed to fit most people. They work to block out noise by completely covering the outer ear. Muffs can be “low profile” with small ear cups or large to hold extra materials for use in extreme noise. Some muffs also include electronic components to help users communicate or to block impulsive noises.
Workers who have heavy beards or sideburns or who wear glasses may find it difficult to get good protection from earmuffs. The hair and the temples of the glasses break the seal that the earmuff cushions make around the ear. For these workers, earplugs are best. Other potential drawbacks of earmuffs are that some people feel they can be hot and heavy in some environments.
Manufacturers are receptive to comments from hearing protection users. This has led to the development of new devices that are hybrids of the traditional types of hearing protectors. (Visit NIOSH searchable compendium of hearing protectors) Because many people like the comfort of foam plugs, but don’t want to roll them in dirty environments, a plug is now available that is essentially a foam tip on a stem. You insert this plug much like a pre-molded plug without rolling the foam.
Scientists are developing earmuffs using high-tech materials to reduce weight and bulk, but still effectively block noise. On the horizon may be earplugs with built in two-way communication capability.
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Still, the best hearing protector is the one that is comfortable and convenient and that you will wear every time you are in an environment with hazardous noise.
Noise muffs, sometimes called noise reduction ear muffs, contain two tightly fitted ear cups that cover each ear entirely, blocking noise from entering the auditory system. They are best used for intermittent exposure to noise and provide noise reduction as well as durability.
Noise muffs are easy to keep track of and comfortable to wear. Unlike ear plugs, they can be worn in spite of ear infections or impacted earwax.
Studies suggest that noise muffs can provide greater noise reduction than ear plugs, but may make it harder to pick up softer sounds. To alleviate this problem, some noise muffs have built-in electronic communication systems, so that wearers can communicate clearly with others.
Noise muffs are practical for situations with intermittent exposure to noise, such as on a flight line. They’re easy to put on and take off and consistently provide a high level of protection. Ear cup seals can be added to provide extra protection and warmth in cold environments, as well as an added level of comfort.
On the other hand, they can be uncomfortable to wear in hot climates, in which case ear plugs may be a better choice. It’s important to remember that noise muffs block out sound by creating an airtight seal. It may be tempting to stretch out the noise muffs to loosen the seal, but this compromises their effectiveness and exposes the wearer to harmful noise levels that may cause significant hearing damage.
There are two important things to keep in mind when wearing protective noise muffs:
The headband must be tight to maintain the seal around the head. If the headband tension decreases, the noise reduction will decrease as well.
Fit is equally important. If the ear cups are too large or loose on the head, they cannot create an airtight seal and effectively protect against hazardous noise. Keep in mind that if the noise muffs are too small for the wearer’s head, they may cause discomfort. If they’re too small to cover the entire ear, their protective value can be compromised.
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