Customizable ePTFE Waterproof Breathable Membrane High Airflow & IP68 Protection

Outdoor electronic enclosures are continuously exposed to harsh environmental conditions such as temperature fluctuations, rain, dust, and wind. These changes can create pressure differentials inside sealed housings, placing stress on seals and increasing the risk of condensation, water ingress, and component failure.Our Adhesive Vent Membranes help improve the reliability and longevity of sealed electronic devices in two ways:

• They allow air to flow freely into and out of the enclosure, equalizing pressure to reduce stress on seals and minimize condensation.
• They provide durable hydrophobic and oleophobic protection against water, dust, salts, corrosive fluids, and particulates, supporting IP67 / IP68ratings.

The peel-and-stick design enables fast and easy installation, either manually or through automated processes, on the interior or exterior of enclosures. The low-outgassing adhesive forms a strong and durable bond to a wide variety of housing materials.

In addition to standard sizes, SST offers full customization of shapes, sizes, thicknesses, and airflow rates to meet specific application requirements.

Shenzhen Sandeli Precision Technology Co., Ltd. produces ePTFE waterproof and breathable membranes using expanded polytetrafluoroethylene (ePTFE) microporous film as the core material. Through a biaxial stretching process, a nano-scale microporous structure is formed. With pore sizes ranging from 0.1μm to 10μm, the membrane achieves IP67/IP68-grade waterproof and dustproof protection while maintaining stable gas exchange capability. The product is available in roll stock, sheet stock, and custom die-cut formats, suitable for high-volume assembly in industrial applications such as consumer electronics, automotive components, outdoor lighting, and smart wearables.

The choice of airflow rate depends on the internal gas volume of the product and the rate of temperature change. The larger the volume and the faster the temperature changes, the higher the required airflow rate. For consumer electronics (watches, earphones), 300–800 ml/min/cm² is generally recommended; for outdoor lighting fixtures, 1000–2000 ml/min/cm² is recommended. Sandeli offers free airflow rate calculation services.

IP67 is suitable for daily waterproof and rainproof scenarios (1 meter underwater for 30 minutes), while IP68 is suitable for prolonged submersion or high-pressure water jet cleaning scenarios (1.5 meters underwater for 30 minutes+). Both use the same material, with only slight differences in membrane thickness and structure, and the price difference is minimal. If you are unsure about the usage environment, it is recommended to directly choose IP68 for greater safety.

Adhesive bonding (using 3M tape, etc.) is simple to install and low-cost, making it suitable for flat housings. The recommended application temperature is 21°C–38°C to ensure proper adhesion. Mechanical clamping (pressing the membrane with an O-ring or gasket) is suitable for high-temperature or high-vibration environments and offers higher reliability. Sandeli can recommend the optimal solution based on the product structure.

Yes. Regular specifications can be shipped within 3 working days, and custom die-cut samples can be produced within 5 working days. Contact 13430844019 with your product specifications to arrange free sample testing.

• Waterproof and Breathable in One: The ePTFE microporous structure effectively blocks liquid water molecules from penetrating while allowing gas molecules to pass freely. Measured hydrostatic pressure ≥ 80 kPa (IP68 standard), and the airflow rate can be customized from 300 to 3000 ml/min/cm² @ 70 mbar depending on the application scenario.
• Stable Operation Across a Wide Temperature Range: The membrane's temperature resistance spans –40°C to 125°C, with no brittle fracturing at low temperatures and no softening at high temperatures. Suitable for harsh environments such as automotive engine compartments and outdoor base stations.
• Chemical Corrosion Resistance:The PTFE substrate is chemically inert, resistant to acids, alkalis, organic solvents, and industrial salt spray. No performance degradation after 72 hours of neutral salt spray testing.
• Precision Die-Cutting: Supports high-precision die-cutting for external dimensions ranging from 1.5mm to 150mm, with tolerances controlled within ±0.1mm. Can be laminated with backing materials such as PET, non-woven fabric, and acrylic adhesive layers to meet the material requirements of automated assembly lines.
• Easy installation
• Large air permeability
• High IP rating
• Small footprint

• Consumer Electronics | Waterproof and sound-permeable protection for phone receivers, speakers, and microphones; barometer port protection for smartwatches; cavity pressure balancing for TWS earphones.
• Automotive Industry | Waterproof and breathable solutions for ECU control units, headlights, millimeter-wave radar, and battery pack pressure relief valves to prevent circuit failure caused by condensation.
• Outdoor Equipment | Cavity protection for LED street lamps, surveillance cameras, and communication base station filters to balance internal and external pressure differentials caused by day-night temperature variations.
• Medical & Industrial Sensors | Protective breathable components for precision instruments such as thermometers, blood pressure monitors, and gas detectors.