or your senses perfection fo es r your senses - infield
Contents
1. Custom Made Hearing Protection comes under the category PPE Personal Protective Equipment and must comply with the following standards e EN 352 2 2002 Hearing protection Ear plugs e EN 352 6 2002 Hearing protection with electrical audio input The standards were completed in 2003 with new classifications e EN 13819 1 Individual Hearing Protection Physical test methods e EN 13819 2 Individual Hearing Protection Acoustic test methods e The old 352 series is limited to the specific demands that are set by delivery conditions and guidelines Positive List of Infield Otoplastics Operations Instructions Type of marking Usage Limits db A db A HM L H M L ER Music ER15 95 96 80 90 81 91 SVWE ER Music ER25 104 103 89 99 88 98 SVWE ER Work ER15 95 96 80 90 81 91 SVWE ER Work ER25 104 103 89 99 88 98 SVWE Phonor Select 1 106 103 91 101 88 98 SVW Phonor Select 2 104 100 89 99 85 95 W Phonor Select 3 99 93 84 94 78 88 Phonor Select alpha 106 104 91 101 89 99 SVWE Phonor Select Digital 1 112 108 97 107 93 103 SVW Phonor Select Digital 2 105 101 90 100 86 96 W Phonor Select Digital 3 102 98 87 97 83 93 Phonor Select Digital alpha 110107 95 105 92 102 SVW Description HM High Medium frequency noise Lc La lt 5 dB HML verified according to EN 458 Low frequency noise L La gt 5 dB HML verified according to EN 458 Audible signals in railway construction are discernible Audible s2. Innovative filter electronics reacting automatically to impulse and continual noise e Electronic active hearing protection e ideal for individual testing through modular structure e Easy use buttons e Battery size 10 average battery life 70 hours Unique laser etched serial numbers e Easy care by removing from the Otoplastic Warning Electronic items should not be allowed to become wet Otoplastic Full modular Sits securely and comfortably in the ear canal Made from super soft 60 shore material dB A ao U Us oe 85 90 95 100 105 110 G Average value in dB e High density easy to clean surface The Otoplastic can be combined with CE Eug 67 7 689 0 BIEM ER headphones and ER 9 15 and 25 85dB A Reference passive hearing protection filters giving extra functionality Electrical active Hearing Protector Shooter e Passive hearing protector ER 9 15 or 25 Communication and music BIEM 105 E Sound pressure level of Ho M Lo Sound field in dB A dB A 65 70 75 80 85 90 95 100 105 110 O E e a a Average value and Standard deviation of A rated equivalent diffuse schield Sound pressure level Sleepfit The Sleepfit is designed to fit particularly flat to the ear Making it very comfortable whilst in the lying position such as sleeping It is designed as a sleeping aid for shift workers or those who have disturbed sleep due a partners snoring It is also ideally suited for persons who
3. Select Digital 1 2 and 3 offer good protection across the entire frequency spectrum Phonor Select Digital Filter has S V W and E Entry y see page 17 Because of our many years of experience in the field of hearing protection the Phonor Select Digital Filters were developed exclusively for INFIELD and are utilised across a wide range of industries All Phonor products are made from acrylic material UV light curing material e Choice of 4 filters types e Manufactured with rapid prototyping process e Otoplastics can be reproduced at any time e Filters are interchangeable without special tools e Easy cleaning of the earplugs by purging Unique Laser etched serial number Otoplastic with Phonor Select Filter Digital Dust resistant e Recommended period of usage 4 years e Made in Germany e Available only from INFIELD Safety Attenuation Phonor Select Digital fin Hz ips 250 500 1000 2000 4000 8000 H oy SNR Filter M in dB PSD 3 15 5 17 0 20 7 25 0 30 9 320 29 4 26 20 16 23 PSD Alpha a Attenuation in dB noe f in Hz 125 250 500 1000 2000 4000 8000 Filter S in dB PSD 3 5 1 37 3 6 39 4 2 4 2 6 0 Filter APV 84 in dB PSD 3 10 4 133 1741 Zi 26 7 27 8 23 4 INFIELD ER Work The new ER Work combines the practical advantages of Phonor Select range and the linear insulation of the ER Music filter It is particularly suited for forklift truck drivers people who have a lot of ph
4. for possible hearing damage is 85 decibels dB the pain threshold lies between 120 and 130 dB That is the equivalent to the noise of a jet plane at a distance of 100 meters In the home decibel value prevails between 40 and 50 dB In offices up to 65 dB In traffic the decibel easily reaches 85 dB and Discos and Rock Concerts are around 110 dB and clearly louder than a jack hammer with 100 dB In the work place there are specific regulations as to when the wearing of hearing protection is mandatory Often the hearing protectors that are provided are not worn Why The reason most often given is the hearing protectors are often uncomfortable and communications unclear The result is a feeling of isolation Some users complain of headaches while others complain about material allergies or unpleasant sweating caused by the hearing protection 25 Complacency 23 No Reason 14 Restricted communication 10 Sweating 8 BB contact allergies 7 BB icadaches 7 BB Tedious to get used to 6 Foreign body feels uncomfortable Reasons for rejection of Hearing protectors Conventional Hearing protector Individually customized hearing protection designed by INFIELD Safety is 6 g paneu ae comfortable and reduces noise levels without acoustically isolating the user a cad LA P from his or her environment s Pri l F TA INFIELD Otoplastics INFIELD Phonor Select Phonor S
5. is measured in Decibels dB The CE mark is only issued for hearing protection if this value is above legislated level The Mf value in dB determines the mean attenuation of a frequency For example 25dB at 500Hz means a noise reduction of 25dB at the frequency of 500Hz The Sf value in dB is an assumed standard deviation that contributes towards the determination of the APV The SNR value is the mean attenuation for the complete analysed spectrum of frequencies i e from 125 8000HZz The H M L values are the mean attenuation in the respective areas of frequencies H High frequency 2000 8000 Hz Medium frequency 500 2000 Hz Low frequency 125 500 Hz r g Io The graphs illustrate the attenuation that is achieved by the individual filters Customised hearing protection provides attenuation that is evenly balanced across the relevant spectrum of frequencies in contrast to standard hearing protection 16 Laws and Regulations First of all the term noise needs to be defined Legislation describes it as any type of sound that disturbs bothers or damages the health of people i e all sounds that compromise physical mental and social well being According to EU guidelines 2006 the following applies at 80dB or above Hearing protection has to be provided at 85dB or above Hearing protection must be worn Within Europe all hearing protection products must conform to the appro priate CE standard
6. ordered as accessories Upon request a personal instruction can also be made available by our sales representatives Leak test There are various possibilities by which Otoplastic can be tested for leakage The results speak mainly about the fit of the Otoplastic and less about the actual leakage of the filter While Leakage tests are mostly measured per ear monaural whereas the actual leakage is measured for both ears binaural 11 Scope of INFIELD Delivery INFIELD The ear its anatomy Outer ear The outer ear is made up of the visible portion called the pinna and the ear canal The human pinna s functions are of no great importance whilst animals can move and turn their ears to locate sounds Middle ear The middle ear consists of eardrum tympanic cavity and Eustachian tube Inner ear The inner ear is made up of the organ of Corti and the cochlea Ear canal The ear canal links the outer ear and the eardrum It is approximately 3 4cm in depth and 0 5 1cm in diameter It is completely covered with skin The outermost part of the ear canal near the pinna is supported by cartilage the inner part by bone In the section made up of cartilage sebaceous glands secrete the yellow cerumen which is expelled by tiny hairs Ear drum Between the ear canal and the tympanic cavity lies the eardrum This membrane is approximately 1cm in diameter and 0 1mm thick On the inside of the eardrum is a mucous membrane It a
7. sound waves via the auditory nerve to the brain 13 Profile of the Ear 1 Outer ear 2 Ear canal 3 Ear drum 4 Hammer 5 Anvil 6 Stirrup 7 Oval window 8 Archway 9 Auditory nerve 10 Cochlea 11 Eustachian tube 12 Round window 13 Tympanic cavity INFIELD Hearing how does it work To be precise the human ear doesn t process sounds but sound waves that resonate the eardrum The resonance is amplified by the Ossicles in the Tympanic Cavity and reaches the inner ear through the Oval Window where the actual hearing process begins A very important factor in the hearing process is the frequency of sound The unit of frequency is Hertz Hz Hertz is a measure of the number of Possible damages Frequency of the audibility almost undecipherable Continuous exposure to high noise levels causes hearing loss that is irreversible in 95 of cases Very often our bodies show symptoms that are not obviously linked with noise like insomnia poor concentration and cardiovascular disease If you suffer from any of these complaints it is Hearing protection Irritation caused by Disturbance lesion area Hearing protection has to be provided needs to be worn Sensory threshold Pain barrier advisable that your surroundings are analysed sound waves per second The amplification of sound by the Ossicles for noise In case that source of dangerous noise depends on the frequency The best amplifi
8. wear full protective helmets such as motorcyclists The Sleepfit is coloured yellow as standard Other colours are available on request INFIELD Swim protection Experience the joy of care free bathing and swimming without the discom fort of water entering your ears Safety during bathing swimming and shower For children and adults Individual custom made Buoyant durable tear proof skin friendly and super soft silicon material e easy to wear and remove through anatomically made grip easy to clean available in various respective colour combinations Please note that the swim protector does not provide any protection during diving Motor special e Comfortable custom fit protection e Clear discernment of warning signals and traffic noise Ideal for helmet wearers due to its extra small size Fitted with the Phonor Select 1 filter as standard e Other Phonor Select filters can also be used e Tested according to DIN EN 352 2 Attenuation Phonor Select eS finHz 125 250 500 1000 2000 4000 s000 E a ee Bae Filter Mg in dB lt L aa Oo D U ba L lt L000 2000 INFIELD 10 Delivery INFIELD s scope of delivery always contains the following e Stable storage box e Leather case for Otoplastic e Cord inclusive of a Shirt Clip apart from ER music e Cleaning stick and Otofresh cream e User s manual Cleaning spray and tissues can be
9. INFIELD Safety UK Ltd 1210 Parkview Arlington Business Park Theale Reading RG7 4TY T 011896 57899 F 011896 57788 E info infield safety co uk W www infield safety de A Signet Armorlite Group Company Q samen 13111102 effective from 04 2014 INE Blindness separates us from things Deafness separates us from people Immanuel Kant Hearing Protection 2014 INFIELD Contents Topic Preface Products Products and special models The Human ear Hearing How does it function When do we perceive something as loud Loss of hearing caused due to Noise self protection period Frequency analysis Laws and regulations Hearing protection according to INFIELD measure Moulding and Material Advantages of INFIELD Otoplastics Material Maintenance Service Contact Preface Hearing damage caused due to noise Is Irreversible When we sleep the entire body relaxes the muscles the eyes the ears or at least that is what we believe However our ears never sleep How else can we explain how we can be awoken by noise Be it a siren the cry of a baby Our partner coughing or the alarm clock All these sounds wake us Most people are unaware of the health hazards caused by noise Young people are particularly vulnerable to hearing damage as they tend to expose themselves to high volume levels at rock concerts in the discos or while listening to their MP3 player with head phones The established threshold
10. ant noise in the ears defined For example as a note or a word The ear responds 7 times faster a is mostly described as a whistling sound but can also take the form of a than the eye If we could see as fast as we can hear we would see every buzzing whooshing or rattling It cannot be measured but is proven to lead single frame in TV broadcasts instead of fluid movements K to psychological problems and even suicide There are many attempts for therapy but no guarantees for a successful cure Tinnitus is not only caused by noise but also by stress middle ear infection and decreased blood flow to the inner ear or some medications Often these symptoms are ignored because they aren t very obvious at first and they have a very slow progression Diagram of the cochlea 1 Scala vestibule Protect yourself your employees and your relatives with INFIELD customised 2 Organ of Corti hearing protection 3 Scala tympani 4 Auditory nerve When do we perceive something as loud Self protection period ere Every noise not only has a specific frequency but also a volume Volume is Another crucial factor is the duration for which one is exposed to noise Sound dB Ginnie measured in Decibel dB and the following graph shows us typical well The human ear has a kind of self protection comparable to the self BE Sener recioc known sounds with their respective Decibel level Our pain threshold is protection of the skin against the sun s harmfu
11. cation of sound is achieved in the range of the human voice between 1000 and 2000 Hz When a sound wave reaches the Oval Window via the previously mentioned pathway it is levels have been identified and cannot be Cochlea l passed on via the Perilymph inside the Scala vestibule to trigger the Basilar eliminated hearing protection must be wom sa aa 5 a 2 2 eo 8 g L Stirrup 5 Organ of Corti Membrane Depending on the frequency sensory hairs in different locations Find more conditions associated with high og S g a e a pS Se 2 Oval window 6 Scala tympani on the Organ of Corti are triggered An analogy would be waves breaking at noise levels in the following paragraphs E S Sg 3 S Ra 3 Helicotrema 7 Round window specific points on the beach depending on their size This way we can 3 z L g S 7 4 Scala vestibule distinguish between high and low pitches From the Stereocilia the sound sensorineural hearing loss a 3 g am wave travels towards and resonates the Reissners membrane The Loud ieee destroy the hair cells in the Organ z a membrane experiences a deflection by the incoming wave to the sensory 7 _ and can cause partial or complete loss Damages for the ear filaments or neanng This resonance then triggers receptor cells which send an electric impulse Tinnitus lat Tinkle along the auditory nerve to the brain Here the sound is recognised and BA NO o Around 3 Million people suffer from Tinnitus This const
12. ds to EN 352 2 INFIELD biem ER Custom made head phones Is it possible to combine sound protection and lifestyle in one product Yes High quality materials and the latest electronic technologies allow INFIELD to create a custom made combination of protection and head phones specially designed for you Suitable for making phone calls listen to music and communication BIEM ER is suitable for any ER hearing protection worldwide Simply remove the filter from the earplugs insert the headphones enjoy your music phone or other communications device that accepts a 3 5mm Jack plug BIEM ER and original INFIELD ER Hearing Protection The ideal combination of custom made headphones and custom made hearing protection Available in transparent yellow red or blue Technical Details lmpedance 18 ohm 10 Echo 110dB 3 20 Hz 20KHz Aluminium case Weather proof protection Tested as per DIN 352 2 and 352 6 for communication cable Kink proof cable with integrated microphone Switch for On Off as well as receiving calls j Stereo cable 3 5mm jack plug Attenuation Biem ER f in Hz 125 250 500 1000 2000 4000 8000 H M L SNR Filter Mer in dB lt L jaa ge 2 qo 9 q lt f in Hz 125 250 500 1000 2000 4000 8000 Filter S in dB Filter APV 84 in dB INFIELD Shooter Custom made Hearing protections for Shooters Hunters and Industry Electronics
13. elect Aloha 1 2 and 3 offer good protection across the entire frequency spectrum Phonor Select Filter has S V W and E Entry see page 17 Because of our many years of experience in the field of hearing ya protection the Phonor Select Filters were developed exclusively for ee INFIELD and are utilised across a wide range of industries S All Phonor products are made from soft Futuretec silicone 60 shore iS we They are also available in acrylic material UV light curing material D e Choice of 4 filters types e High quality manufacture for a perfect fit e Less attenuation at 4000Hz for better communication Filters are interchangeable without special tools e Easy cleaning of the earplugs by purging Otoplastic with Phonor Select Filter All earplugs have a unique laser etched serial number No special cleaning agents required e Recommended period of usage 5 years e Made in Germany e Available only from INFIELD Safety Attenuation Phonor Select f in Hz 125 250 500 1000 2000 4000 8000 H M L SNR Filter Mf in dB PS 2 18 3 19 7 23 0 25 4 29 9 30 8 36 9 26 22 18 25 S 9 6 11 2 16 7 2271 28 3 29 4 36 0 24 17 11 20 35 E e _ x a _ ZZ a T T PS 2 a Attenuation in dB A iT ii Hz 125 250 500 1000 2000 4000 8000 PS2 152 159 19 3 22 1 25 7 28 4 31 4 PS3 5 1 8 4 13 6 19 1 23 5 26 2 30 6 INFIELD Phonor Select Digital Phonor
14. elect can also be made digitally in UV polymerizate material INFIELD hearing protection has the considerable advantage that it does not cause any feeling of pressure in the ear canal even after hours of wearing By default all types are manufactured in transparent materials The otoplastics can be specified in the signal colours Red Blue or Yellow Maintenance No special treatment products are required Cleaning with water is sufficient Service and Guarantee Service We offer comprehensive consultation and aftercare Please contact us directly for general information and individual queries Guarantee INFIELD hearing protection products are of high quality and can last many years with the appropriate care We offer a 2 year warranty on fit and protection Testing of Attenuation Values Infield safety provides with their hearing protectors guaranteed Insulation values The individual products have cleared the Type Test accor ding to EN 352 2 2 2002 in the PZT GmbH Wilhelmshaven and is CE certified CE 1974 19 INFIELD
15. fe ENRI Filter Mg in dB L000 2000 4000 Attenuation Phonor Select Digital f in Hz 125 250 500 1000 2000 4000 8000 H M i SNR Mg in dB fin Hz 125 250 500 1000 2000 4000 8000 H M L SNR finHz 125 250 500 1000 2000 4000 sooo ME A ES ie 0 00 000 01010 20108 310100 Frequency table in original size Pages 4 7 Frequency analysis For optimum protection detailed knowledge of the users work environment is needed Noise within manufacturing is not only generated by the machines in use but also many other background noises with different frequencies Specialists have fixed 1000HZz as the standard frequency this is the lower range of the human voice INFIELD s frequency analysis always refers to 1000HZ as well as six other frequencies Three of these frequencies are higher in octave steps three are at lower octave steps The fixed frequencies are 125 250 500 1000 2000 4000 and 8000Hz Please note that a comprehensive frequency analysis is a sign of professionalism and quality of service In the frequency based tables for noise reduction you find alot of numbers We would like to explain these to you Now that you are familiar with how these frequencies have been chosen we ll explain more about the individual numbers Frequency analysis jargon The APV Assumed Protection Value
16. ignals for vehicle drivers in road traffic conditions are discernible Meets the criteria for General warning signals Informative noises and Voice comprehension Audible signals for shunting and mainline railway locomotive drivers are discernible The hearing protectors were tested and or certified by the IFA institute ems owl 17 x INFIELD Emptying out of the plastic mould Work on the slug Drilling of the hole for the filter Hearing protection according to INFIELD According to usage INFIELD offer several variants of Otoplastics available in a range of colours e Phonor Select e Phonor Select Digital ER Work e ER Music Special versions All models can be fitted with a tiny metal ball detection ball These specialised models are mainly of interest to the food and chemical industries By default a cord with shirt clip is delivered in Green It is also available in high visibility Neon Orange or made of difficult flammable material Yellow or as a detectable metal woven cord Black The shirt clip is also detectable Moulding and manufacture The ear plug is custom moulded to each user It consists of the silicone earplug and the acoustic filter itself Before beginning the manufacturing process an examination has to be carried out to assess that it is safe to inject the moulding putty into the ear canal During this examination excess Cerumen earwax or Cerumen pl
17. l rays This allows us to be ne Sema eas cee around 120dB Hence sound with a volume level above 120dB causes pain exposed to a noise level of 80 dB for about eight hours without being ee E oan lesa in Our ears damaged A small increase in the noise level to 83 dB reduces this duration te i i i 98 a Should we need to maintain a distance of approx 1m in order to have a by half to only four hours The course of this phenomenon can be seen in a oud aighees normal conversation the background noise level could be up to 80dB In the image opposite y Tenoria Ee ai such environments one should not stay long without wearing hearing pro So if one is regularly exposed for long periods of time in environments with 3 PETTEE tection noise levels in excess of 80dB ear protection is essential to prevent T pano damao due to constant noise permanent damage Be 80 5 6 Vi 8 hearing loss at constant exposure Heavy goods vehicles 1 Heavy traffic Self protection acceptance Vacuum cleaner Normal conversation Possible hearing damage Whispering Quiet Room Windstill forest Ticking clock Hearing threshold on the left Examples of various volumes in decibels short time maximum value INFIELD INFIELD Analysis of Individual Noise Situation Frequency Hz 125 250 500 1000 2000 4000 8000 APVf dB 5 8 1O 2 22 2 Legislated APVs for the CE Mark Attenuation Phonor Select i finHz 125 250 500 1000 2000 4000 8000 H ie
18. larity Perfect for Musicians Compatible with in ear monitoring and mobile phone headsets e Recommended period of usage 5 years e Made in Germany e Unique laser etched serial numbers EA a Qi ER Music Attenuation ER Music NRZ 125 250 500 1000 2000 Filter Mf in dB ER 25 252 24 1 24 8 255 24 2 ER 15 18 6 17 6 16 5 16 5 15 0 ERS 13 7 11 2 11 3 10 7 133 5 2 20 2 ec ER 15 E ER 9 EO O A T O z 5 125 250 s1010 10100 f in Hz 125 250 500 1000 2000 4000 8000 Filter Sf in dB ER 25 S 4 0 3 8 2 8 3 4 3 7 57 ER 15 55 37 2 9 2 5 2 6 2 1 4 0 ER 9 3 2 2 6 32 2 0 359 23 5 1 Filter APV 84 in dB ER 25 215 20 1 21 0 22 20 8 20 4 24 2 ER 15 13 1 13 9 1S 14 0 12 4 125 16 6 ER 9 105 8 6 8 1 8 7 9 8 10 1 1378 RC 9 at 500 Hz and 4000 Hz the APV84 is lower than the minimum required attenuation with regards to EN 352 2 l e the standard CE does not apply INFIELD f in Hz 125 250 500 1000 Filter Sf in dB ER 25 37 4 0 3 8 2 8 ER I5 5 5 37 29 29 ER 97 3 2 2 6 272 2 0 Filtro APV 84 in dB ER 25 2105 20 1 21 0 22 EROS 13 1 13 9 13 6 14 0 ER 9 10 5 8 6 8 1 8 7 l e the standard CE does not apply 4000 24 1 14 6 12 4 8000 29 9 20 6 18 9 20 8 12 4 9 8 H M L SNR 21 22 21 23 13 13 14 15 10 9 9 11 4000 8000 S07 5 7 2a 4 0 23 5 1 20 4 24 2 12 5 16 6 10 1 13 8 RC 9 at 500 Hz and 4000 Hz the APV84 is lower than the minimum required attenuation with regar
19. one calls or work with a walkie talkies Workstations where machines engines are monitored and where discernment of machine engine tone Is impor tant The 3 filters within the group ER 9 15 and 25 have linear attenuation over the entire frequency range offering excellent speech under standing and perception The ER 15 filter meets the criteria for the S V W and E mark See page 17 Tiiioere F ER Work e Choice of 3 filters e Filters have linear attenuation e True sound Is perceived e Very good communication clarity e Recommended period of usage 5 years e Made in Germany e Unique laser etched serial numbers Attenuation ER Work f in Hz 125 250 500 1000 2000 4000 8000 H M SNR Filter Mf in dB ER 25 25 2 24 1 24 8 25 5 24 2 24 1 29 9 21 22 21 23 ER 15 18 6 17 6 16 5 16 5 15 0 14 6 20 6 13 13 14 15 ER 97 13 7 ee 11 3 10 7 13 3 12 4 18 9 10 9 9 11 T 25 i faa 99 ER 25 ER 15 15 z ER9 10 pean Ei i 2 a frequency in He 125 250 500 L000 2000 meee 8000 ER Music The ER 9 15 and 25 filters have been developed for musicians They absorb sound across all frequencies without significant tone change The filters satisfy the S V W and E descriptions see page 17 ER is also ideal for pilots and persons who regularly attend concerts or clubs e Choice of 3 filters e Filters have linear attenuation e True sound Is perceived Very good communication c
20. ppears grey and shiny from the outside Tympanic cavity In the tympanic cavity there are the three ear bones or ossicles Hammer anvil and stirrup as well as the semicircular canals of the vestibular apparatus Hammer anvil and stirrup The hammer anvil and stirrup are three tiny bones that are connected to each other They directly couple and amplify sound energy from the eardrum to the inner ear Oval window Sound waves travel via this membrane from the ossicles to the inner ear The inner ear is located in the cochlea well protected by the petrous portion of the temporal bone pyramid Round window The round window is positioned adjacent to the oval window and Is the end point of the scala tympani Eustachian tube The Eustachian tube links the tympanic cavity with the pharynx Its main function is pressure equalisation in the ear Cochlea The cochlea has three ducts called scale The scalavestibuli and the scala tympani which both contain perilymph Between these two is the scala media filled with endolymph which contains the organ of Corti The word cochlea is the latin word for snail and comes from the shape of the organ Organ of Corti Authentic Hearing Organ The organ of Corti is the essential part of our hearing It is located in the cochlea and contains 25 000 hair cells each equipped with 100 hairs called stereocilia These hairs are the sensory receptors of the auditory system and pass on information from
21. ugs should be removed from the ear canal The moulding is performed according to current best practice for the fitting of hearing aids The moulding material is a pliable two component putty based on silicone This is injected into the ear canal without any noticeable pressure The moulding process is normally not uncomfortable The result is a perfect copy of the ear canal and part of the Pinna In the next production step this mould is then used to form the final earpiece This ensures it fits comfortably into the ear canal A ventilation hole is drilled into the part that inserts into the ear canal and the appropriate acoustic filter is fitted specifically tuned to your requirements for noise reduction Advantages of individual custom made Hearing protectors e Customised for perfect fit e Optimum protection e Communication is retained Filters are individually chosen to suit the working environment Important sounds and signals can still be heard Ideal comfort hardly noticeable High user acceptance Easy to wear with other items of PPE Easy to fit Easy to clean Many applications For example metal industry car manufacture printing industry cement works food industry chemical industry woodworking industry bottling plants and motor sports 18 Material and Maintenance Material All ear protectors are made from a soft flexible material Their mechanical and chemical stability assures a long service life The Phonor S
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