3M 370-1047 Technisches Datenblatt [de]
3M™ E-A-R™ Switch Protection
Earplugs 370-1047
Technical Data Sheet
Product description
The 3M™ E-A-R™ Switch Protection Earplugs 370-1047
are designed for insertion into the ear canal to help reduce
exposure to hazardous noise including steady state and
peakimpulse.
The product features a special acoustic filter that lets lower
level of sound through with little noise reduction for greater
situational awareness (Awareness Mode) and at the same time
offer protection against high levels of peak impulse noise.
The product works in two distinctive modes; Awareness mode
and Normal Protection mode.
In the normal Protection mode, the product offers higher level
of protection against continuous noise compared against
Awareness mode. To use it in Awareness mode simply press
the rocker switch marked with ‘CAE’ and to use it in the Normal
Protection mode press the rocker switch marked with ‘3M’.
The product can be easily switched between the two modes
to help adapt to the workplace needs whilst the earplugs are
seated inside the ear canal.
The product is supplied ready assembled fitted with medium
size ear tips but also includes a pair of each of the three
different size ear tips (small, medium and large) for better fit.
Each pair of plugs are differentiated between the left ear and
right ear by means of the letter “L” and “R” moulded on the
flexible retainer respectively to ensure correct fitting.
The soft flexible retainer helps ensure the ear plug remain firmly
in the ear canal.
The product is supplied with convenient storage case and
a bright coloured connecting cord to prevent loss of ear plugs.
Market segments
Key features
Ŕ Specially designed soft retainer helps ensure the ear plug
remains seated inside the ear canal.
Ŕ Rocker assembly featuring the patented acoustic filter
for protection against high level of peak impulse noise.
Ŕ Made from soft and durable material.
Ŕ Supplied with three different size ear tips for best individual fit.
Ŕ Can be used against peak impulse noise up to 160dB peak.
Ŕ Easy to wash and clean.
Ŕ Supplied in a durable storage case featuring a convenient
metal chain.
Ŕ Supplied with a soft polyester cord as standard.
The 3M™ E-A-R™ Switch Protection Earplugs are ideally suited
where the required level of attenuation ranges between 15
dB and 28 dB SNR for continuous noise level. These products
are specially designed for greater situational awareness in a
dynamic workplace environment. Typical segments include:
Ŕ Metal processing
Ŕ Construction
Ŕ Textile manufacture
Ŕ Automotive
Ŕ Chemical & pharmaceutical
Ŕ Hunting and shooting
Ŕ Transportation
3M™ Personal Safety Division | 3M™ E-A-R™ Switch Protection Earplugs 370-1047
Approvals
The 3M™ E-A-R™ Switch Protection Earplugs are tested and CE
approved against EN352-2:2002. The product has also been
tested for peak noise reduction at the Institute of Saint Lois (ISL)
in France against an internal test protocol developed by ISL.
Full subjective attenuation measurements have been carried
out in both in Awareness and Normal Protection mode.
Materials
The following materials are used in the manufacture
of this product.
Ear tip: TPE (Krayton Polymer)
Mechanical Filter: POM (Acetal)
Rigid Post (connecting ear tip to filter housing):
ABS (Acrylonitrile Butadiene Styrene)
Housing: PA (Polyamide)
Rocker Switch: POM (Acetal)
Flexible Retainer: VMQ (Silicone)
Connecting cord: PET (Polyester)
Nominal size designation (mm):
Ŕ 6 (smallest fitted) and 12 (largest fitted)
– when used with medium size ear tips
Ŕ 6 (smallest fitted) and 11 (largest fitted)
– when used with small size ear tips
Ŕ 8 (smallest fitted) and 14 (largest fitted)
– when used with large size ear tips
Subjective attenuation data in normal protection mode
Frequency (Hz) 63 125 250 500 1000 2000 4000 8000
Mf (dB) 28.3 27.9 26.8 28.3 27.2 31.5 33.0 39.2
sf (dB) 5.8 4.3 4.4 3.4 4.0 4.4 2.3 4.9
APVf (dB) 22.5 23.6 22.4 24.9 23.2 27.1 30.7 34.3
SNR = 28dB H = 28dB M = 25dB L = 24dB APVf = Mf – sf
Subjective attenuation data in awareness mode
Frequency (Hz) 63 125 250 500 1000 2000 4000 8000
Mf (dB) 5.7 5.8 7. 9 10.1 17.3 23.9 23.3 28.3
sf (dB) 2.5 2.8 3.1 2.3 2.6 3.4 2.7 5.4
APVf (dB) 3.2 3.0 4.8 7. 8 14.7 20.5 20.6 22.9
SNR = 16dB H = 20dB M = 12dB L = 7dB APVf = Mf – sf
Mf = mean attenuation, Sf = standard deviation, APVf = assumed protection value
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