The optimum filter choice for mobile phones depends on the technical requirements as well as the design of the housing. Sefar's Acoustic fabric range has been proven to work in many generations of mobile phones. Depending on the mesh opening, open area and fabric thick- ness the acoustic resistance ranges from approximately 6 to 145 Rayl MKS.
The precise mesh openings and defined air permeability guarantee very reliable acoustic attenuation respectively transparency, much more consistent than what can be achieved with non-woven or paper filters. In addition a woven fabric screen will protect the loudspeaker from dust, debris and moisture and thereby significantly increase its lifetime.
Sefar filters made of woven fabrics are thin and flexible while dimensionally stable and strong - making it easy to handle Sefar filters in any manufacturing process. All Sefar Acoustic fabrics comply with the requirements of EU 2002/96/EG Directives WEEE and RoHS.
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