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HEARING PROTECTION

Why I need a hearing protector?

The ear has three main parts: the outer, middle, and inner ear. The outer ear (the part you can see) opens into the ear canal. The eardrum separates the ear canal from the middle ear. Small bones in the middle ear help transfer sound vibrations to the inner ear. When noise is too loud, it begins to kill the nerve endings in the inner ear.  The closer and longer you are to the source of intense noise, the more damaging it is. The harmful noise doesn’t damage your hearing only ,but also your body health. A ringing in the ears, called tinnitus, commonly occurs after noise exposure, and often becomes permanent. Some people react to loud noise with anxiety and irritability, an increase in pulse rate and blood pressure, or an increase in stomach acid. Very loud noise can reduce efficiency in performing difficult tasks by diverting attention from the job

 

Is there some simply way to tell the sound measurements?
Decibels (dB) measure the intensity of sound. The scale runs from the faintest sound the human ear can detect, which is labeled 0 dB, to more than 180 dB, the noise at a rocket pad during launch. Most experts agree that continual exposure to more than 85 decibels is dangerous. Recent studies show an alarming increase in noise-related hearing loss in young people.

Approximate examples of decibel levels:

  • Faintest sound heard by human ear – 0 dB
  • Whisper, quiet library – 30 dB
  • Normal conversation, sewing machine, typewriter – 60 dB
  • Lawnmower, shop tools, truck traffic – 90 dB
  • Chainsaw, pneumatic drill, snowmobile – 100 dB
  • Sandblasting, loud rock concert, auto horn – 115 dB
  • Gun muzzle blast, jet engine (such noise can cause pain and even brief exposure injures unprotected ears) – 149 dB
  • The Occupational Safety and Health Administration’s limit for noise without hearing protectors – 140 dB

 

How should I choose the ear defender for my hearing protection plan?
The choice of hearing protectors is a very personal one and depends on many factors including level of noise, comfort, and the suitability of the hearing protector for both the wearer and his environment. Most importantly, the hearing protector should provide the desired noise reduction. It is best, where ear defender must be used, to provide a choice of a number of different types to choose from.

 

How to understand the hearing protection attenuation data?

There are two ways to help wearer understand the attenuation data simply:

SNR-Single Number rating. An SNR is a single number rating system determined according to International Standard ISO 4869. The tests are carried out by commercial laboratories that are independent of the manufacturers.

NRR-Noise Reduction Rating based on ANSI S12.6-1997 [or most current edition] to estimate hearing protector noise attenuation.

 

NRRs, SNRs are expressed in dB's and are used as a guide for comparing the potential noise reduction capability of different hearing protection devices. Since the procedures for measuring NRRs and SNRs are different, the NRR and SNR values for an individual hearing protector are different. For further details please refer to the American Standard ANSI S12.6.

 

Manual instruction for using an ear muff

  1. Unfold the ear muff by holding the headband with one hand and pulling both cups down with the other hand.
  2. Extend the headband to put the ear muff over wearer’ s head and place the cups on ears. Pull the cups outward and position over wearer’s ears so that they fully enclose the ear and seal tightly against the head.
  3. Adjust the headband and cups into a comfortable position.
  4. To get higher performance, we suggest no block such as hairs, glasses or ear rings between the cups and wearer’s head to keep the ear cushions seal firmly against your head.
  5. Put the ear muff on before exposing the wearer to load noises and wear it during the whole noise exposure.
  6. Routinely wash as necessary  with mild soap.
  7. For disinfection use 50% solution of Propyl  Alcohol in water(“Rubbing Alcohol”) to wipe the ear muff. Allow to dry naturally.
  8. This product may be adversely affected by certain chemical substances. Further information should be sought from the manufacturer.
  9. Store in a cool, dry place before and after use. Retain original packing for protecting the ear muff during transport.
  10. the ear muffs are fitted, adjusted and maintained in accordance with the manufacturer’s declaration

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  • HEARING PROTECTION