Hearing Conservation

• First, measure the noise level; noise levels above 85 dBA (decibel) are considered hazardous
• If you must raise your voice to be heard at normal conversation distance (3 feet), noise levels are above 85 dBA and hearing protection should be worn
• Engineer the noise out or down when possible-this can be done primarily with sound barriers or enclosures. Secondly, look to administrate whereby the employee's exposure is limited to the amount of time they are exposed to hazardous noise levels. Lastly, provide adequate hearing protectors after the first two methods have been successfully applied
• Train employees on the hazards of noise and the proper steps they need to take, including proper selection and fitting of hearing protectors, to keep their hearing safe
• Employees who are in hazardous noise levels as a frequent part of their job should have their hearing tested annually to assure their hearing is being properly protected. The initial test is known as the baseline
• Appropriate hearing protectors should be provided to those who are working in noise hazardous areas. According to Federal law, employers must provide a "variety of suitable hearing protectors" from which the employees may choose. A minimum of three different styles of hearing protectors needs to be offered to the affected employees. Records of the elements of the hearing conservation program should be kept, particularly the annual hearing tests of each person

Hearing Protectors

Foam earplugs: made of slow-recovery foams allowing the wearer to roll-down the earplug and insert it into the ear canal where it re-expands to create a seal against noise. Capable of providing very high levels of protection when properly fitted; low cost and comfortable. Probably the most difficult style of hearing protection to fit properly - fit training is essential. Usually available with and without a neck cord for convenient storage when not in use. Some are available in sizes

Premolded earplugs: molded out of plastic or other elastic materials and often incorporate flanges to create an airtight seal in the ear canal. Usually a longer lasting hearing protector, which can be cleaned and reused for a longer period of time. Generally provide lower levels of protection and comfort. Available with neck cords and often with carrying cases for storage and to promote reuse.

Push-In style foam: a hybrid of the foam and premolded earplugs consisting of a foam-sealing pod at the end of an insertion stem. Provides the benefits of comfort and high attenuation common to foam earplugs along with the hygiene and ease of use advantages of push-in fitting without having to roll-down the earplug. Available with and without neck cords

Metal Detectable style: this form of hearing protection is required for use in the food industry

Hearing bands: consist of earplugs at the ends of a U-shaped band. Earplugs are held in the ear by the tension of the band. Great for intermittent use since fitting is quick and the band provides convenient storage around the neck when not in use. Using replacement tips can minimize cost. Typically provide lower levels of noise protection than other devices

Earmuffs: cups, worn over the ears, which are held against the side of the head by a band or hardhat attachment. Easiest device to use and capable of providing a wide range of protection levels, depending upon which model is selected. Effective where impact noise occurs and is transmitted through the bones connected to the ear (i.e. mastoid). Headbands are available which provide for band positioning over-the-head, behind-the-head, attached to a hard hat or multi-band positions. Should last for a long time, but muff cushions should be replaced at least every six months

Electronic and other specialized protectors: many hearing protectors are modified to allow for radio communications, personal entertainment system connections, improved voice communications in noise and even integrated AM/FM radio. Check with MSC if you have a unique requirement

Application of NRR Rating for a Labeled NRR of 25 dB