Pressure Equalization Vent Membrane — Full Technical Specifications
Pressure Equalization Vent Membrane — Full Technical Specifications
A pressure equalization vent membrane (泄压平衡透气膜) is an ePTFE vent that balances internal and external air pressure in sealed enclosures while blocking water and dust. It prevents housing deformation, lens fogging, and seal failure caused by altitude, temperature, or washing changes. This page provides the complete data sheet and selection guide.
What Is a Pressure Equalization Vent?
Sealed enclosures build pressure differences when temperature or altitude changes. The vent's microporous ePTFE membrane lets air move both ways to equalize pressure, while its hydrophobic structure blocks liquid water and dust. This protects gaskets and housings from fatigue.
Complete Technical Data Sheet
| Parameter | Typical Range / Value | Test Standard |
|---|---|---|
| Base material | ePTFE / PTFE composite | — |
| Air flow (透气量) | 200–12,000 ml/min @ Ø10 mm, 7 kPa | ASTM D737 |
| Pressure equalization | Balances 0.1 – 1 bar differential | — |
| Water column (防水) | 2 – 50 m water depth (IP67 / IP68) | ISO 811 / IEC 60529 |
| IP rating | IP67 / IP68 | IEC 60529 |
| Operating temperature | -40 °C to +260 °C | IEC 60068-2 |
| Thickness | 0.05 – 0.25 mm | ASTM D374 |
| Chemical resistance | Excellent | — |
Why Pressure Equalization Matters
Without a vent, a sealed box heats and cools, building negative or positive pressure that flexes the housing, stresses the seal, and pulls in moisture. A pressure equalization vent relieves this continuously, extending seal life and preventing condensation inside lamps, sensors, and battery packs.
Typical Applications
- Automotive headlights, tail lights, and sensors
- EV battery packs and BMS enclosures
- Outdoor cameras and solar controllers
- Industrial control boxes and gauges
- Marine and agricultural electronics
How to Select the Right Vent
Choose based on: (1) required air flow for equalization speed, (2) water column for the environment, and (3) mounting form (patch, screw-in valve, or insert). High-submersion parts need the 30–50 m grade.
Frequently Asked Questions
What pressure difference can it balance?
Standard vents relieve 0.1 – 1 bar differential, enough for altitude and temperature swings in most enclosures.
What IP rating is achievable?
IP67 / IP68 with a 2–50 m water column depending on grade.
Does it prevent condensation?
Yes. By equalizing pressure and allowing vapor exchange, it stops the pressure-driven moisture ingress that causes fogging.
What is the operating temperature?
-40 °C to +260 °C continuous, far beyond PU / non-fluorine films capped near 120 °C.
How deep can it be submerged?
ePTFE vents reach 2–50 m water column; PU / non-fluorine films only 1–2 m.
What mounting styles exist?
Self-adhesive patches, snap-in vents, and screw-in vent valves for different housings.
Can it be customized?
Yes. Air flow, shape, membrane area, and adhesive are customizable to your standard.
Will it degrade the seal over time?
No — the vent reduces seal stress, extending gasket life rather than reducing it.
What certifications apply?
RoHS and REACH; verified per ASTM and IEC methods listed.
Request a Free Sample or Quote
Need a vent for your enclosure? Contact Mimoyin for free samples, drawings, and a customized pressure-equalization quote.
Breathability & Water-Pressure Capability
| Tier | Breathability (ml/min @ Ø10 mm, 7 kPa) | Water pressure | Typical application |
|---|---|---|---|
| Low breathability (high waterproof) | 200–1,000 | 50–30 m | Deep-water / harsh waterproof; custom per spec |
| Mid (balanced) | 1,000–5,000 | 30–2 m | Automotive / general outdoor; custom per spec |
| High breathability | 5,000–12,000 | 10–1 m | High heat dissipation / low waterproof need; custom per spec |
Mimoyin does not sell fixed catalog SKUs. For each project we match the membrane material to your drawing and required breathability, acoustic loss, and water pressure, then produce samples for your validation testing.
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.