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If the acoustic transducers arent protected, sound quality can diminish, and the device can ultimately fail. By looking into the gun from the muzzle, before the breech is opened, the gas can often be seen burning with a pale-blue flame as it slowly mixes with air and a curious singing noise is heard at the same time. That is why Gore developed vents using expanded polytetrafluoroethylene (ePTFE) membranes, which have a node-and-fibril construction that allows gas molecules (air) to pass through while completely repelling water and solid particles. When the temperature falls, tire pressure can be affected (the cold causes the gas inside the tire to become denser and more compressed). Vents designed specifically for portable electronics with acoustically transparent materials that create a barrier against external elements and everyday liquids while equalizing pressure inside the housing - and maintaining acoustic performance - need to be engineered in at the initial design stage. For custom venting solutions, Gore can partner with you on everything from initial design to production-line integration. Extreme changes in temperature (a sudden thunderstorm on a hot, sunny day), altitude changes (in transit), or the repetitive heating and cooling cycles of internal telecommunications components - any of these can cause a pressure differential within a sealed enclosure.

Pressure differentials are created when a sealed enclosure is exposed to rapid, extreme or recurring changes in ambient conditions. They are being used by more and more people every day for longer periods of time in an expanding diversity of operational conditions. See Figure 1. Smart phones need to be protected from challenging conditions like being exposed to rain or spilled coffee, being dropped in the sand at the beach, and the dust and dirt present all around us. Vents made from this material protect sensitive electronics from contaminants while also allowing the enclosure to breathe in order to avoid damage or device failure caused by pressure differences between the internal device and ambient conditions. Woven material (top) captures particles equal to or greater than its specified pore size, whereas nonwoven materials (bottom) capture a greater range of particle sizes and shapes. Whereas non-woven materials capture fine particles, ePTFE membranes have microscopic pores that block virtually all particles in various shapes and sizes. Using specially developed test methods and in-house environmental testing facilities, companies have been able to demonstrate that non-woven materials are able to capture particles of various shapes and sizes because of their three-dimensional structure.

At present, non-woven materials may provide sufficient protection for most situations. If covered with a Protective Vents in stock mesh material,the electronics inside the housing may be exposed to damage from contaminants. OEMs may address these problems by installing a protective mesh over the acoustic openings. However, just selecting a material based on particle size does not address the entire problem. The right material depends on the type of housing used for the device. Finally, at the bottom of the device there are two twistable knobs and one button. To the right of these rectangular boxes there is a water meter that looks similar to a thermometer. To the right of the manual trigger, and located in the bottom right-hand corner of the device, there is another twistable knob that controls which mode the ventilator is in. Many of the big economies are the bigger sources right now, but not exclusively. Our fittings are size 10 fittings. They are also more likely to maintain consistent airflow because they capture particles in a tortuous path not limited by a specific pore size. Many device manufacturers simply specify a maximum pore size. Manufacturers and fabricators know that high-performance venting can be the key to improved profitability and product value.

In portable electronics that use waterproof transducers, internal pressure changes can affect a sealed devices performance. Through continued testing to identify the major causes of smart phone component failure, Gore has identified several distinct problem areas-water, temperature, pressure and corrosion-that require protection against. Figure 1: This exploded view shows the areas where a smart phone can be vulnerable to particulate and liquid ingress, as well as sudden variations in pressure and temperature. Let's talk about one of the most common problems: getting a phone wet. Oh, and you can make phone calls on them, too. This effect can reduce acoustic output and eventually damage the transducer. The demands on these devices continue to escalate, exposing them to increased risk of damage from exposure to liquids, particulates, temperature, pressure, and corrosion. Todays smart phones are increasingly complex wireless devices with ever-expanding functionality. In appliance DESIGN Magazine, Global Business Leader Victor Lusvardi and Product Specialist Chuck Seipel talk about how to keep smart phones protected.