ePTFE Acoustic Waterproof Membrane, Low Acoustic Loss 1dB, IP68 Ingress

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 Acoustic Membrane – Low Acoustic Loss 1dB, 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 acoustic waterproof and sound-permeable membranes. While achieving IP68-grade waterproofing, the membrane maintains extremely low acoustic loss, ensuring high-fidelity audio output for acoustic devices.

Traditional waterproofing solutions often sacrifice sound quality to achieve waterproofing. Sandeli's acoustic sound-permeable membrane, through precisely controlled microporous structure, blocks liquid water while allowing sound waves to pass through with almost no loss. Measured acoustic loss is below 1dB, with a flat frequency response, effectively avoiding issues such as muffled or distorted sound.

Supports circular die-cutting from Φ3mm to Φ50mm, as well as various square and special-shaped configurations. Can be combined with 3M/Nitto and other branded adhesives, providing a one-stop service from design to mass production.

• Waterproof and Acoustic Sound-Permeable in One: The ePTFE microporous membrane blocks liquid water while maintaining an extremely thin structure and low acoustic impedance. Measured insertion loss is ≤2dB @ 1kHz, with no significant acoustic performance degradation after 30 minutes of IPX7 immersion. This solves the protection challenges for acoustic devices in humid, rainy, and submerged environments.
• Ultra-Thin and Highly Flexible: Membrane thickness can be as low as 0.02mm, with excellent flexibility. Suitable for compact installation spaces such as miniature microphones and miniature speakers, without affecting overall structural stack design.
• Broadband Flat Frequency Response: The acoustic attenuation curve remains stable across the 100Hz–10kHz frequency range, with no significant resonance peaks, ensuring frequency response consistency for voice calls and music playback.
• Reliable Adhesive Solutions: Pre-laminated with high-performance acrylic adhesive layer, with bond strength ≥ 8N/25mm (180° peel, stainless steel plate), temperature resistance –40°C to 125°C, with no edge warping or leakage after high-temperature and high-humidity aging tests.

The ePTFE microporous structure of the waterproof acoustic membrane blocks liquid water ingress while allowing sound waves to pass through efficiently, thanks to its extremely thin membrane thickness (0.02mm–0.15mm) and low impedance characteristics. The membrane's pore size ranges from approximately 0.1 to 5 microns—far smaller than water droplets but permitting sound wave vibration transmission—achieving excellent acoustic performance with sound transmission >90%.

Sandeli provides a complete service chain for acoustic device customers, from membrane material selection and acoustic testing to die-cut delivery. We can collaborate with customers on specialized testing and validation, including insertion loss, frequency response curves, and waterproof ratings. Regular specifications can be sampled within 3 working days, and custom dimensions and adhesive layer solutions within 5 working days. For waterproof acoustic solution needs, please contact our engineering team to discuss specific acoustic specifications.

If you need a pressure equalization solution for sealed cavities, please check our Waterproof Breathable Membrane; if you need a pressure equalization solution for large temperature-difference environments, please check our Pressure-Equalizing Breathable Membrane; if you need high-fidelity sound protection, please check our Waterproof Sound-Permeable Membrane. Sandeli offers free sample testing and selection guidance across four series of ePTFE membranes.

• Bluetooth Earphones/Headphones Waterproof and sound-permeable protection for speaker and microphone ports
• Smartphones Waterproof acoustic solutions for earpieces, microphones, and speakers
• Smart Speakers Full-band waterproof sound-permeable protection, maintaining clear sound quality
• Walkie-Talkies/Vehicle Communications Waterproof acoustic protection for outdoor communication devices
• Hearing Aids Precision acoustic waterproofing, ensuring medical-grade sound quality