Hearing and Ear Protection Standards
EN 352-1: 2002
Hearing Protectors – Ear Muffs
EN 352-2: 2002
Hearing Protectors – Ear Plugs
EN 352-3: 2002
Hearing Protectors – Helmet Mounted Ear Muffs
EN 352-4: 2002
Hearing Protectors – Level Dependent Ear Muffs
EN 352-8: 2002
Ear Muffs with Entertainment Radio
All these standards establish requirements with regards to the manufacture, design, performances and test methods.
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).