Shenzhen San Deli Precision Technology Co., Ltd.
| Waterproof rating | IP67 / IP68 |
| Delivery Form | Roll stock / Sheet stock / Die-cut finished parts |
| Temperature range | -40℃ ~ 125℃ |
| Double-Sided Tape | 3M / Nitto / TESA |
| Substrate Material | ePTFE (expanded Polytetrafluoroethylene) |
| Membrane Thickness | 0.01mm ~ 0.3mm |
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Product Specification
| Waterproof rating | IP67 / IP68 | Delivery Form | Roll stock / Sheet stock / Die-cut finished parts |
| Temperature range | -40℃ ~ 125℃ | Double-Sided Tape | 3M / Nitto / TESA |
| Substrate Material | ePTFE (expanded Polytetrafluoroethylene) | Membrane Thickness | 0.01mm ~ 0.3mm |
Water ingress into sealed housings, condensation and fogging, and internal/external pressure differentials can lead to device failure or performance degradation. There is a need to balance protection with breathability/sound transmission.
With the Waterproof Sound-Transmitting Membrane – Wide-Band Sound Transmission, IP68 Waterproof, Shenzhen Sandeli Precision Technology, we achieve IP-level protection while maintaining breathability/sound transmission. We support custom die-cutting, adhesive backing, and specifications tailored to your structure.
Shenzhen Sandeli Precision Technology Co., Ltd. specializes in the R&D and precision die-cutting of waterproof sound-transmitting membranes, providing professional solutions that balance waterproofing and sound transmission for audio devices.
All products undergo rigorous waterproof testing, acoustic testing, and aging tests. Combined with precision die-cutting processing, we ensure the consistency and reliability of every delivered product. We support custom production based on drawings and samples, with rapid prototyping available.
The Sound-Transmitting Waterproof Membrane is Sandeli's premium series, designed specifically for high-fidelity audio devices. The core difference lies in distortion control: the sound-transmitting membrane has a THD increment of <0.5% (compared to 1–2% for the standard acoustic membrane) and frequency response fluctuation of <1.5dB. In short, choose the Sound-Transmitting Waterproof Membrane for music listening and professional sound reinforcement; the Acoustic Waterproof Membrane is sufficient for voice calls and speech applications.
No. Although the ePTFE material is thin, it has excellent toughness and puncture resistance. The 0.01mm thickness is designed for sound transmission requirements. If the installation environment involves sharp objects or high airflow impact, Sandeli can laminate a PET or non-woven fabric support layer to enhance strength without affecting acoustic performance.
Yes. Sandeli can collaborate with customers on verification of electroacoustic parameters including frequency response curves, THD (Total Harmonic Distortion), and maximum sound pressure level. Acoustic difference data before and after membrane application can be provided quantitatively to help optimize acoustic chamber design. Regular specifications can be sampled within 3 working days, and custom solutions within 5 working days.
Yes. Sandeli's Sound-Transmitting Waterproof Membrane maintains low distortion even under high sound pressure (>100dB). For high-power scenarios, we recommend selecting a slightly thicker specification (0.03–0.05mm) to balance sound pressure tolerance and acoustic performance.
An audio brand developing a Wi-Fi smart speaker needed to install a waterproof membrane in front of the speaker to achieve IP54 certification. However, testing revealed that after adding the membrane, Total Harmonic Distortion (THD) increased from 0.3% to 1.8%, severely affecting sound quality ratings. After switching to Sandeli's Sound-Transmitting Waterproof Membrane (THD increment <0.5%, membrane thickness 0.03mm), THD was controlled within 0.6%, the product passed Hi-Res certification and successfully entered mass production.
A hearing aid manufacturer needed to solve the problem of sweat seeping through the microphone port during user wear, which caused sound distortion and corrosion. The requirements were ultra-thin membrane (total thickness <0.15mm including adhesive) and low acoustic distortion. Sandeli custom-designed a Sound-Transmitting Waterproof Membrane (diameter 2.5mm, membrane thickness 0.02mm, total adhesive thickness 0.12mm) with THD increment <0.3%, which passed sweat-proof testing. This solution has been adopted in two of their flagship hearing aid products.
With ePTFE microporous membrane thickness of only 0.01mm–0.1mm, high sound wave transmission, and insertion loss ≤1dB @ 1kHz, the membrane achieves IP68 waterproofing while ensuring high-fidelity sound output, particularly suitable for high-end audio devices with demanding sound quality requirements.
Membrane thickness can be as low as 0.01mm, making it one of the thinnest waterproof sound-transmitting membranes available on the market. It can be applied to sound output ports of miniature speakers, receivers, and other precision acoustic devices without occupying additional space.
Acoustic attenuation is <1dB across the 300Hz–8kHz vocal frequency range, with natural high-frequency extension and no significant resonance peaks, ensuring clear and natural voice calls and rich detail in music playback.
Pre-laminated with high-performance adhesive layer, bond strength ≥ 8N/25mm, temperature resistance –40°C to 125°C, and passed 1000-hour "double 85" (85°C / 85% RH) high-temperature and high-humidity reliability testing.
The Sound-Transmitting Waterproof Membrane utilizes the ultra-thin (0.01mm–0.1mm) and uniformly distributed microporous structure of ePTFE material, allowing sound waves to pass through efficiently while blocking liquid water. The membrane has a porosity of over 85%, enabling sound wave vibrations to transmit through the microporous structure without obstruction, achieving excellent acoustic performance with sound transmission >95%, while meeting IP68 waterproof protection requirements.
Sandeli provides a complete service chain for audio equipment manufacturers, from membrane material selection and acoustic simulation testing to precision die-cut delivery. We can collaborate with customers on specialized testing including frequency response curves, total harmonic distortion, and IP waterproof ratings. Regular specifications can be sampled within 3 working days, and custom solutions within 5 working days. For sound-transmitting waterproof solution needs, please contact our engineering team to discuss specific acoustic specifications.
If you need a daily waterproof and breathable solution, please check our Waterproof Breathable Membrane; if you need an acoustic waterproof solution, please check our Acoustic Waterproof Membrane; if you need a pressure equalization solution for large temperature-difference environments, please check our Pressure-Equalizing Breathable Membrane. Sandeli offers free sample testing and selection guidance across four series of ePTFE membranes.
The ePTFE Sound-Transmitting Waterproof Membrane focuses on balanced transmission across a wide frequency band, making it suitable for devices that need to accommodate both voice and music playback. The ePTFE Acoustic Waterproof Membrane, on the other hand, emphasizes low acoustic loss and high fidelity, making it ideal for professional audio equipment with extremely high sound quality requirements. Both products can be flexibly selected based on the actual application scenario.
Company Details
Business Type:
Manufacturer
Year Established:
2018
Total Annual:
>500,000 - 1,000,000
Employee Number:
>50-100
Ecer Certification：
Verified Supplier
About Shenzhen San Deli Precision Technology Co., Ltd. Founded in 2010, Shenzhen San Deli Precision Technology Co., Ltd. is a professional manufacturer specializing in E-PTFE, PU waterproof, oil-resistant, breathable, and acoustic membrane materials. Located in Songgang, Shenzhen, our 3,000㎡ facto... About Shenzhen San Deli Precision Technology Co., Ltd. Founded in 2010, Shenzhen San Deli Precision Technology Co., Ltd. is a professional manufacturer specializing in E-PTFE, PU waterproof, oil-resistant, breathable, and acoustic membrane materials. Located in Songgang, Shenzhen, our 3,000㎡ facto...
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