Waterproof Breathable Membrane Manufacturer \| Mimoyin Technology
Waterproof Breathable Membrane
Mimoyin Technology Co., Ltd. manufactures high-performance ePTFE waterproof breathable membranes that block liquid water and dust while allowing air and vapor to pass through. Our membranes are IP67 and IP68 certified, suitable for automotive electronics, TWS audio devices, wearables, and industrial equipment.
How ePTFE Waterproof Breathable Membrane Works
Expanded PTFE (ePTFE) is created by stretching PTFE at high temperature, forming a node-and-fibril microporous structure with billions of pores per square inch. The pore size (0.1–1.0 μm) is small enough to block water droplets (20–100× larger than pores) and PM2.5 particles, yet allows air molecules (~0.0004 μm) and water vapor to diffuse through.
Technical Specifications
| Parameter | Typical Value | Custom Range |
|---|---|---|
| Base Material | ePTFE (composite layers available) | Customizable |
| Waterproof Rating | IP67 / IP68 | Up to IP69K |
| Air Permeability | 500–3000 ml/min @ 7kPa | 100–5000 ml/min |
| Operating Temperature | -40°C to +125°C | -200°C to +260°C (special grade) |
| Membrane Thickness | 0.1–0.8 mm | 0.05–1.0 mm |
| Pore Size | 0.2–0.8 μm | 0.1–2.0 μm |
| Adhesive Options | Acrylic PSA | Silicone / Epoxy / Hot-melt |
| MOQ | 1000 pcs (samples 500 pcs) | Negotiable |
All specifications can be customized. Sample lead time: 3–5 days. Mass production: 7–15 days.
Industrial Applications
- Automotive Electronics — ECU vents, sensor ports, battery pack pressure relief valves. Operating range -40°C to +85°C. Learn more about automotive solutions →
- TWS Earbuds & Wearable Audio — Acoustic vents with ≤1dB loss. View TWS membrane specifications →
- Industrial Sensors & IoT Devices — Extends device life from 1–2 years to 5–10 years by preventing condensation and corrosion.
- Outdoor LED Lighting — Prevents fogging and sealing failure in humid environments.
- New Energy & Energy Storage — Battery pack pressure balance valves with 100% air-tightness testing. Explore ePTFE vent solutions →
Why Choose Mimoyin ePTFE Membrane
- 10+ Years of Experience — Specialized in waterproof breathable membranes since 2015.
- Self-Developed Stretching Process — Precise control over pore size and distribution.
- 100% Air-Tightness Testing — Every batch tested before shipment.
- Full-Size Die-Cutting — Custom shapes and sizes based on your drawings.
- 24-Hour English Technical Support — Engineering team responds within one working day.
- Trusted by Tier 1 & Consumer Brands — Proven track record in automotive and electronics.
Frequently Asked Questions
What is the difference between ePTFE and PTFE?
PTFE is the raw polymer; ePTFE (expanded PTFE) is created by stretching PTFE to form a microporous structure. ePTFE is the actual membrane material used for waterproof breathable applications.
Can ePTFE membrane be reused after exposure to water?
Yes. ePTFE is hydrophobic and self-cleaning. Once the water source is removed, the membrane dries and maintains its performance.
What air permeability value do I need?
It depends on your application. Automotive vents typically need 500–1500 ml/min; TWS acoustic vents need higher values (1500–3000 ml/min) for pressure equalization without affecting sound quality.
Is ePTFE compatible with ultrasonic welding?
Yes, ePTFE membranes can be integrated into ultrasonic-welded assemblies. We provide membrane + adhesive backing solutions compatible with automated assembly lines.
Does ePTFE block RFID or wireless signals?
No. ePTFE is transparent to RF signals (RFID, NFC, Bluetooth, Wi-Fi) and will not interfere with wireless communication. Learn more about membrane principles →
What is the typical service life?
>10 years. Accelerated aging tests (1000 hours) show less than 5% change in air permeability and waterproof performance.
What waterproof rating can ePTFE achieve?
Standard products are IP67/IP68 certified. With reinforced backing and custom design, IP69K is achievable. IP67 vs IP68 explained →
Ready to Discuss Your Application?
Contact our engineering team for technical consultation, free samples, and custom die-cutting solutions.
Frequently Asked Questions
What waterproof rating do your membranes achieve?
Our ePTFE waterproof breathable membranes achieve IP67 and IP68 protection grades. They withstand immersion at 1 meter depth for 30 minutes (IP67) and continuous submersion (IP68), while maintaining stable airflow for pressure equalization.
Can you provide custom sizes and die-cutting shapes?
Yes, we offer full custom die-cutting services. We can produce membranes in any size or shape according to your specifications, including round, rectangular, and complex custom geometries. Our Class 10,000 cleanroom ensures precision cutting for production volumes.
What is the minimum order quantity (MOQ)?
We support both prototyping and mass production. Free samples are available for testing with 3-5 working days delivery. For mass production, MOQ is flexible depending on the product specification and can be discussed based on your project requirements.
What industries and applications do your membranes serve?
Our membranes are widely used in automotive electronics, lithium batteries, smart wearables, consumer electronics, LED lighting, medical devices, and industrial sensors. Applications include speaker acoustic vents, pressure balance vents, microphone waterproof membranes, and battery venting solutions.
How long is the delivery time for samples and mass production?
Free samples are delivered within 3-5 working days via express shipping. Mass production typically takes 7-15 working days depending on order quantity and customization requirements. We provide one-stop technical support from sample testing to mass production.