Pressure Equalization Vent Membrane \| ePTFE \| Mimoyin
Pressure Equalization Vent Membrane
Mimoyin Technology Co., Ltd. manufactures high-performance ePTFE pressure equalization vent membranes designed to prevent sealing failure caused by internal pressure buildup. Our vents are widely used in automotive electronics, EV battery packs, industrial sensors, and outdoor lighting, ensuring long-term reliability under harsh environments.
Why Pressure Equalization Matters
Sealed enclosures face significant challenges due to temperature fluctuations, altitude changes, and internal chemical reactions (e.g., battery gas generation). Without pressure equalization:
- Seal Failure — Excessive internal pressure deforms gaskets and housings.
- Condensation — Moisture enters during pressure drops, causing corrosion.
- Component Damage — Sensors, batteries, and electronics fail prematurely.
- Safety Risks — In EV batteries, uncontrolled pressure can lead to thermal runaway.
ePTFE pressure equalization vents allow air to pass through while blocking water, dust, and contaminants, maintaining a stable internal environment.
Technical Specifications
| Parameter | Typical Value | Custom Range |
|---|---|---|
| Base Material | ePTFE (multi-layer composite) | Customizable |
| Waterproof Rating | IP68 | IP69K available |
| Air Permeability | 500–2000 ml/min @ 7kPa | 100–5000 ml/min |
| Pressure Resistance | ≥50 kPa (5m water column) | Up to 100 kPa |
| Operating Temperature | -40°C to +125°C | -200°C to +260°C (special grade) |
| Membrane Thickness | 0.2–0.8 mm | 0.1–1.0 mm |
| Adhesive Options | Acrylic PSA | Silicone / Epoxy |
| MOQ | 1000 pcs (samples 500 pcs) | Negotiable |
All specifications can be customized. Sample lead time: 3–5 days. Mass production: 7–15 days.
Key Applications
- EV Battery Packs — Pressure relief valves for lithium-ion battery modules, preventing thermal runaway. Explore ePTFE vent solutions →
- Automotive Electronics — ECU vents, sensor port protection, headlight ventilation.
- Industrial Sensors — Enclosure venting for pressure transmitters, flow meters, and analyzers.
- Outdoor Lighting — Preventing fogging and sealing failure in LED streetlights and landscape lighting.
- Energy Storage Systems (ESS) — Large-scale battery cabinet pressure management.
Why Choose Mimoyin Pressure Vents
- IP68/IP69K Certified — Reliable waterproofing under high-pressure washing and immersion.
- High Air Flow — Rapid pressure equalization to prevent seal deformation.
- Chemical Resistance — ePTFE withstands acids, alkalis, solvents, and automotive fluids.
- Long Service Life — >10 years operational stability in harsh environments.
- Custom Die-Cutting — Precision shapes and sizes based on your enclosure design.
Frequently Asked Questions
How does pressure equalization vent work?
ePTFE vents have micropores that allow air molecules to pass through while blocking liquid water droplets. This balances internal and external pressure without compromising waterproofing.
What is the difference between a vent and a breather?
A vent is a passive component allowing air exchange; a breather often includes additional filtration. Our vents function as high-efficiency breathers.
Can these vents be used for EV battery packs?
Yes, our ePTFE pressure equalization vents are specifically designed for EV battery packs, meeting automotive-grade reliability standards.
What air permeability do I need?
It depends on your enclosure volume and pressure change rate. Automotive applications typically require 500–1500 ml/min; EV batteries may need higher values.
Are these vents reusable?
Yes, ePTFE vents maintain performance after repeated pressure cycles. However, they should be replaced if physically damaged or contaminated.
How to install pressure equalization vents?
Our vents come with adhesive backing (PSA) for easy installation. For automated assembly, we offer ultrasonic-weldable versions. Contact us for installation guidance →
Need Pressure Equalization Solutions?
Contact our engineering team for technical consultation, free samples, and custom die-cutting solutions tailored to your application.
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.