3M 1450 User manual

3
Data Sheet
1450 Ear Muffs
Features
Unique spring design enables equal tension regardless of head
sizes.
Can be worn in 3 distinct positions: working, resting, parking
Designed to avoid echo noise problems in resting position
2-point mounting system for better pressure distribution and
easy manipulation
Unique injection moulded inserts for optimal attenuation
weight: 218g.
Applications
The 3M 1450 ear muffs can be used in many industries where
damaging noise is present and head protection is required, such
as:
Metal industry • Construction
Aircraft • Power plants
Utilities
The 1450 ear muffs are especially recommended for intermittent
wear.
Approvals
Meets the performance requirements of the European Standard
EN 352-3.
An EC Type examination certificate No. 951174 is in force issued
by the Berufsgenossenschaftliches Institut für Arbeitssicherheit
(B.I.A.)
The product is CE marked.
Materials
The following materials are used in the production of this product.
Arm - Acetal and steel
Cup - ABS
Insert - Polyurethane
Cushion - PVC
Spare Parts
The cushions and inserts may be removed when they become dirty
or damaged and replaced by new parts from the 3M 1442 Hygiene
Pack.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Standard
The product meets all the requirements of the European Standard
EN352-3. The main performance tests in this standard are:
Attenuation (see below)
Adjustability: The ability of the ear muffs to fit a range of head
sizes.
Headband Force
Cushion Pressure
Resistance to damage
Ignitability
For more information on the above contact 3M.
Minimum Attenuation
16 test subjects are selected to wear the ear muffs and their
ability to hear sound at different intensities is tested over a range
of frequencies. A minimum attenuation of this sound is required
by the standard. Results from the 3M 1450 and Tuff Master II are
shown below:
Frequency
(Hz)
63 125 250 500 1000 2000 4000 8000
Mean Attenu-
ation (dB)
11.4 11.1 18.1 25.1 27.0 28.6 38.6 40.2
Standard De-
viation (dB)
3.7 3.3 3.3 3.1 2.3 2.4 2.6 3.3
Assumed
Protections
(dB)
7.7 7.8 14.8 22.0 24.7 26.2 36.0 36.9
SNR = 26dB H = 29 M = 23 L = 15
Maintenance
At the end of each shift the cushions of the ear muffs should be
wiped with the 3M 105 face seal cleaner so they may remain
clean and hygienic.
Ear muffs and in particular cushions, may deteriorate with use and
should be examined at frequent intervals for signs of damage. If
this is discovered the cushion should be removed from the earcup
and replaced. Inspect the earcup for damage and cracking. If this
is found, the earcup should be replaced. Finally check the arm to
ensure it is flexible and still maintains sufficient force to hold the
earcups firmly to the side of the head.
If the ear muff cannot be cleaned or a damaged component cannot
be replaced, dispose of the ear muffs and obtain a new pair.
•
•
•
•
•
•
•
•
•
•

Assembly/Wearing Instruction
1. Ear Muff Assembly: Insert the tongue of the ear muff into the slot,
located at the side of the helmet.
3. Resting Position: Pull the ear muff away from the ear until it locks into
position. In the resting position the distance from the ear is far enough to
prevent “echo noise” when communicating. In noisy surroundings, always
wear the ear muffs in working position.
5. Storage: When the helmet is not being used, pull down the ear muffs
and press inwards. Store the ear muffs somewhere clean and dry at
normal room temperature in a uncontaminated area where they are
unlikely to be damaged.
2. Working Position: Adjust the cups aligning the height of the cups making
sure the cup covers the entire ear. Be careful that the cushions seal firmly
against the head with no interference from objects such as respirator
headbands or arms of glasses, in order to obtain the best performance.
4. Parking Position: To store the ear muffs on the helmet, just pull them
into resting position. Then rotate the ear muffs upwards until they lock
again. The cushions will not be damaged and the muffs can dry while in
this position.
Warnings
1) The arms are made of Acetal and the cushions are made of
PVC. This product may be adversely affected by certain chemical
substances. For further information contact 3M.
2) Ear muffs and in particular cushions, may deteriorate with use
and should be examined at frequent intervals for cracking and
leakage, for example, at the start of every shift.
3) Simplified Noise level Reduction (SNR) is based on the
attenuation of continuous noise and may not be an accurate
indicator or protection attainable against IMPULSE noise such as
gunfire.
4) For noise environments dominated by frequencies below 500 Hz
the C-weighted environmental noise level should be used.
Occupational Health Group Occupational Health Group
3M United Kingdom PLC 3M Ireland
3M Centre 3M House, Adelphi Centre,
Cain Road, Bracknell Upper Georges St.
Berkshire RG12 8HT Dun Laoghaire, Co. Dublin, Ireland
Tel: [phone] Tel: [phone]
www.3m.com/uk/ohes
[email protected]
3
CH1450 05/2007