Discover the new Cleanil wipes

From 1st July onwards, the Cleanil wipes will be changing size. Still just as effective, they come in a soft sachet.

100% biodegradable wipes

The environment is a highly topical issue; COTRAL Laboratory are aware of this and offer you 100% biodegradable wipes. Furthermore, they are manufactured using a new technology that limits discharge of chlorine into the environment.

Definitions

Presbyacusis:

Deafness occurring gradually and related to physiological aging of the inner ear.

Tinnitus:

"Buzzing" or "whistling" heard in one or both ears or alternatively in the head in the absence of any sound source in the surrounding environment.

Auditory fatigue:

The defence mechanisms of the hearing system make it possible to reduce the level of the sound vibrations. A sudden noise which startles, a prolonged noise or a high level of noise will diminish the sensitivity of audition. The hearing loss is initially transient. Complete recovery depends on the duration of exposure to noise: from several hours to a few weeks.

Perceptive deafness:

Deafness due to a lesion of the sensory organs, either at the level of the sensory cells of the inner ear, the cochlear nerve or the hearing centres. (Source:  Laboratoire d'Informatique Médicale)

Conductive deafness:

Deafness due to a lesion of the middle or external ear; it impairs hearing of a whispering voice. The deficit primarily affects deep sounds. Aerial conduction is affected, whereas bone conduction is normal or increased. (Source: Laboratoire d'Informatique Médicale)

Cochlea:

Element of the inner ear containing the hearing organ. (Source: Doctissimo.fr)

Ciliated cells:

The ciliate cells located in the liquid contained in the inner ear amplify the sound vibrations and select them by frequency. They transform the mechanical energy into nerve signals.

SNR:

Single Number Rating : overall attenuation value, calculated as a weighted average of the attenuation across all measured frequencies (63, 125, 250 ,500, 1000, 2000, 4000, 8000Hz).

Attenuation:

The certification body equips a panel of testers with COTRAL customised hearing protections. Measures are conducted in each frequency band (65, 125… 8000 Hz) for each individual. The measurements are taken several times with different protections. The attenuation corresponds to the mean value of the measurements for each type of hearing protection - filter. Represented in mf.

Standard deviation:

This measurement corresponds to a mean of the standard deviation of the mean for the different measurement series. For example: an attenuation of 10.6 with a standard deviation of 3.8 means that the attenuation values measured during the trials were between (10.6 + 3.8) and (10.6 - 3.8). Represented in sf.

APV:

This is the guaranteed attenuation value. This value corresponds to: (attenuation - standard deviation). Hence, if a protection has an APV of 7.4 at 125 Hz, one is sure of obtaining a minimum attenuation of 7.4 dB in this frequency band.