Acoustic Vent Membrane — Full Technical Specifications
Acoustic Vent Membrane — Full Technical Specifications
What Is an Acoustic Vent Membrane?
The membrane uses a microporous ePTFE structure with controlled pore size so acoustic waves transmit with minimal loss while water and dust are blocked. Acoustic grade differs from standard breathable film by tighter pore geometry that keeps insertion loss below 1 dB.
Complete Technical Data Sheet
| Parameter | Typical Range / Value | Test Standard |
|---|---|---|
| Base material | ePTFE (acoustic grade) / optional TPU | — |
| Insertion loss (声损) | ≤ 1.0 dB @ 1 kHz | IEC 60268-5 |
| Air permeability (透气量) | 200–12,000 ml/min @ Ø10 mm, 7 kPa | ASTM D737 |
| Water column (防水) | 2 – 30 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 | 0.03 – 0.15 mm | ASTM D374 |
| Chemical resistance | Excellent | — |
Why Insertion Loss Matters
Insertion loss (声损) measures how much sound energy the membrane absorbs. A high-quality acoustic ePTFE film keeps insertion loss at or below 1 dB across the voice frequency band, so call quality and music fidelity are unaffected. By comparison, ordinary PU films can add 0.5–1.5 dB and non-fluorine films 6–10 dB — unacceptable for premium audio.
Typical Applications
- TWS earbuds and headphones (mic + speaker vents)
- Smartphone and tablet microphones
- Wearable and smartwatch speakers
- Outdoor and action-camera audio ports
- Medical hearing and voice devices
How to Select the Right Acoustic Grade
Match three factors: (1) target insertion loss (≤ 1 dB for premium audio), (2) required water column for the use environment, and (3) shape and adhesive for your enclosure. Under-hood or wash-down parts need the higher water-column grade.
Frequently Asked Questions
What insertion loss should I expect?
A proper acoustic-grade ePTFE membrane delivers ≤ 1 dB insertion loss at 1 kHz. PU films run 0.5–1.5 dB and non-fluorine films 6–10 dB.
Can it reach IP67 / IP68?
Yes. Acoustic vents are rated IP67 / IP68 with a 2–30 m water column depending on grade.
Does the membrane block dust?
Yes. The microporous structure stops dust and particulates while transmitting sound.
What is the operating temperature?
-40 °C to +260 °C continuous — suitable for automotive and industrial audio.
Acoustic ePTFE vs TPU — which to choose?
ePTFE gives the lowest insertion loss and best temperature/chemical resistance. TPU is lower cost and sufficient for mild environments.
How is it attached?
Die-cut to shape with PSA backing, then bonded over the speaker or mic port.
Can it be customized per our test standard?
Yes. Pore size, thickness, shape, and air flow are customizable to your specification.
Will it affect waterproofing of the whole device?
No. When correctly specified and mounted, the vent maintains the device's IP rating while enabling sound.
What certifications apply?
RoHS and REACH; properties verified per IEC and ASTM methods above.
Request a Free Sample or Quote
Need the right acoustic grade for your mic or speaker? Contact Mimoyin for free samples and a customized quote with insertion-loss data.
Acoustic & Waterproof Capability
| Property | ePTFE (typical) | Alternative (TPU / non-fluorine) |
|---|---|---|
| Acoustic loss | ≤ 1 dB | 6–10 dB |
| Waterproof rating | IP67 / IP68 | IP67 / IP68 |
| Breathability | 200–12,000 ml/min @ Ø10 mm, 7 kPa | lower / material-dependent |
| Temperature range | −40 to +260 °C | −40 to +120 °C |
Mimoyin does not sell fixed catalog SKUs. We match the acoustic vent membrane to your drawing and required sound-loss / waterproof spec, then produce samples for validation.
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.