> SST-Porous®AV-00 series & Immersion application 【Typcial application：Mobile、wearable device、Earphone、Smartwatch、Bluetooth speaker、Smart speaker、walkie talkie】
Based on in-depth understanding of Porous waterproof membrane and acoustical science, as well as our accumulated years of acoustical experience, SST-Porous®AV-00 series & products suitable for immersion applications not only provide reliable protection against particulate , liquid, dirt and water, but also have excellent acoustical properties.
Summary
Today’s portable electronic devices (such as mobile phones, wearable devices, headphones, smartwatches, Bluetooth speakers, smart speakers, walkie-talkies), these portable products are often used in some harsh environments, such as rainy days, swimming pools, underwater sports, skiing, mountaineering, running and other harsh environments.
The use of these portable products in such harsh environments presents challenges to the structure of the microphone (where the acoustics are received) and the speaker (where the sound is produced) : splashing of dust, pollutants and particles, erosion by sweat, and immersion of fresh and sea water.
These challenges often result in water flooding and blockage of the microphone or speaker, and the increasing number and weight of the microphone will prevent the speaker from producing high pressure level sound, degrading the acoustic quality. Although the IP6X protection level can effectively protect the particulate matter, but the protection of haze, smoke, tobacco smoke and dust size less than 10μm, especially the particles between 1-10μm (the common particle size range in the application environment of mobile electronic equipment), it is difficult to effectively protect;
Smart wearable devices for underwater sports are often required to be waterproof performance up to 3ATM (30 meters waterproof), 5ATM (50 meters waterproof) or even 10ATM (100 meters waterproof).
In order to realize the waterproof, breathable and dustproof tuyere of smart phones and smart wearable devices and the clear & high-quality acoustic quality of microphone, more stringent requirements are put forward for the protection level and waterproof requirements of speakers and microphones.
Solution
SST-Porous ® acoustic Vents suitable for immersion waterproof sound permeable and breathable products
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Technical requirement |
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Smart phone waterproof acoustic permeable (breathable) membrane |
① IP rate：IPX7，IPX8（Waterproof depth ≤2.5 m）② Microphone protection (sound penetration) : maintain excellent sound penetration effect, and have excellent waterproof effect③ Air vent (breathable) : meet the protection level of IPX7,IPX8, while maintaining excellent breathable effect |
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Smart watch waterproof acoustic permeable (breathable) membrane |
① IP rate：IPX7，IPX8（Waterproof depth≤50m，5ATM）② Microphone protection (sound penetration) : The acoustic hole needs to be maintained due to high water resistance, while not allowing significant changes to the acoustic quality③ Air vent (breathable) : The air vent should ensure high water pressure resistance, while having a certain breathable effect |
Product Features
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(01)Overcome acoustic challenges</span >
To ensure good sound transmission, the device needs to have holes. But when sound passes through these pores, liquid will also enter, which may eventually cause problems with device performance and reliability
—SST acoustic breathable products use expanded polytetrafluoroethylene(ePTFE), allows for excellent air flow and sound transmission while effectively blocking water, other liquids and particles.
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(02)Waterproof performance
Today, consumers are increasingly demanding immersive smartphones, wearables, and other mobile electronic devices. Often, reliable waterproofing comes at the expense of sound quality
—SST provides excellent ventilation solutions that balance the pros and cons of different challenges.
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(03)Flexible design
Usually, the appearance and product size of ventilation systems are fixed, which often prevents designers from choosing the products they really need. However……
—SST products have precise sizes and various colors, which can meet your various specifications.
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(04)Reliable installation
Sometimes there are technical challenges in integrating waterproof, dustproof and breathable handheld electronic devices into your product. Size, quantity and specification requirements mean that the installation process can take a lot of time and money.
—The installation process of SST waterproof and breathable products is simple and reliable, and can be carried out manually or automatically, which greatly saves development time.
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Product Features
SST-Porous ® acoustic VentsWaterproof, sound-permeable and breathable products suitable for immersion |
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Smartphone Acoustic Parts
(Mic, Spk) |
Smartphone vents | Smart watch acoustic parts
(Mic, Spk) |
Smart watch vent |
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Waterproof rating |
IPX7,IPX8*1 |
IPX7,IPX8*2 |
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Sound loss@1kHz |
≤2dB*2 | – | ≤3dB*2 |
– |
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Breathability, ml/cm2/min@70mbar |
– | 10000 | – |
150 |
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Water pressure resistance KPa, 50s |
30 | – | 500 |
– |
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Acoustic membrane thickness, μm |
10 | 100 | 10 | 250 |
| Acoustic (breathable) membrane category | e-PTFE (no substrate) | e-PTFE/Nonwoven | e-PTFE (no substrate) |
e-PTFE/Nonwoven |
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Surface properties of sound-transparent membrane |
Oleophobic | |||
| Color |
White |
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Environmentally friendly |
Rosh, Reach, Free PFOA Compliant |
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*1–2.5 meters water depth 30min
*2–50 meters water depth for 1 minute, outside the test specification (OD) 5 within (ID) 2 (unit: mm)
Typical applications
- Smartphone
- Action Camera
- Intercom
- Smart watch
- Smart wearable devices
- Bluetooth Headset
- Smart Home Devices
- Smart Speaker
Product User Guide
SST-Porous ® acoustic Vents waterproof and sound-permeable membrane is an e-PTFE porous membrane prepared by Spade’s unique technology and process. Since the e-PTFE structure is a porous structure, the principle of sound transmission is through the principle of resonance. conducts sound waves.
- gt; It is recommended that the distance between the electroacoustic element and the waterproof sound-permeable membrane be at least 3mm and have good air tightness
- gt; The waterproof membrane is glued to the assembly section of the shell and compacted
- gt; When used in Microphone parts, the air tightness of this part must be good enough, and the sound loss can be controlled between 1~5dB
- gt; If a speaker with a higher power is used, the sound loss will be difficult to overcome
- gt; If the air permeability of the film is insufficient to cope with the sound pressure, it will change the wavelength of the sound wave, resulting in sound distortion or excessive sound loss
- gt; When the front and rear sound chambers of the Speaker are designed to be small, it will be difficult to adjust the sound transmission effect
- gt; Assembly methods and testing methods will affect sound loss, sound quality, etc.
- gt; The application effect of waterproof sound-permeable membrane is variable. The main factors are: structural design, selection of electroacoustic components (power level), application site, installation method and location, and air permeability of the film</li >
- gt; When the power is high (that is, the sound pressure is high), the film will vibrate abnormally and offset the abnormal sound waves:
①Increased sound loss (becomes quieter)
②Sound distortion (waveform change)
③ Noise (such as broken sound) is produced
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WhatsApp：18695679892
