Northrock PPE Catalogue 2019 Volume 1

Portwest’s hearing protection range includes PPE with different level sound attenuation, to be adapted to various working environments giving the correct protection from dangerous noise, without isolating the workers. This new range of earmuffs offers a variety of models and colours allowing a personalised choice. HEARING PROTECTION

PW40

AS/NZS 1270: 2002 Australian and New Zealand standard for Hearing Protectors Devices. This standard specifies the attenuation offered by a hearing protection device through Sound Level Conversion (SLC80). The SLC ensures that the attenuation degree defined for each hearing protector is realistic in 80% of cases (SLC80). The AS/NZS 1270:2012 standard define classes of hearing protection devices based on the attenuation level they offer (see table below) – the higher the class, the higher the attenuation level of the ear defender.

EN 352: 2002 European Standard for Hearing Protectors This standard is made by several parts defining manufacture, design, performances and test methods, for the different types of individual noise protectors. In Particular: EN 352-1: 2002 Hearing Protectors - Ear Muffs EN 352-3: 2002 Hearing Protectors - Helmet Mounted Ear Muffs

The noise attenuation offered by the Hearing Protector is measured with following parameters: SNR (Simplified Noise Reduction): Single average value of attenuation. HML : Attenuation values expressed in terms of average levels of frequencies: H : Attenuation of PPE at high frequencies (pitched noises). M : Attenuation of PPE at medium frequencies.

L : Attenuation of PPE at low frequencies (bass sounds).

CLASS

SLC80 (dB)

Use in working noise *

1 2 3 4 5

10-13 dB 14-17 dB 18-21 dB 22-25 dB

Less than 90dB

90-94 dB 95-99dB

100-104 dB

26 dB or more 104-109 dB *A workplace noise assessment is needed to define the noise level in the workplace; The goal of wearing hearing devices is to compress the perceived noise down to a safe level between 75-80dB.

PROTECTION AGAINST HARMFUL NOISES

240