Kunshan Xinzhenpin New Thin Film Material Technology Co LTD.
| Thickness | 0.10 – 0.50 mm |
| Water Entry Pressure | ≥ 400 kPa |
| Moisture Vapor Transmission Rate | 8,000 – 18,000 g/m²·24h |
| Size | Customizable |
| Supply Ability | Monthly Output: 300,000 sqm |
| Material Compliance | PFAS Free |
| Color | White |
| Oleophobicity Grade | ≥ 7 |
| Chemical Resistance | Corrosion-resistant，Acid-resistant |
| Packaging Details | Small orders by express; bulk orders by FCL sea freight. |
| Delivery Time | 15 working days |
| 90° Peel Strength | ≥ 15 N/25mm |
| Operating Temperature | -40°C to +150°C |
| Payment Terms | T/T |
| Air Permeability | Gurley：3 – 30 s/100ml @ 300 ml |
| Waterproof Rating | IP68 |
| Certification | IATF16949/ISO |
| Brand Name | OEM/ODM |
| Place of Origin | China |
| Model Number | OEM/ODM |
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Product Specification
| Thickness | 0.10 – 0.50 mm | Water Entry Pressure | ≥ 400 kPa |
| Moisture Vapor Transmission Rate | 8,000 – 18,000 g/m²·24h | Size | Customizable |
| Supply Ability | Monthly Output: 300,000 sqm | Material Compliance | PFAS Free |
| Color | White | Oleophobicity Grade | ≥ 7 |
| Chemical Resistance | Corrosion-resistant，Acid-resistant | Packaging Details | Small orders by express; bulk orders by FCL sea freight. |
| Delivery Time | 15 working days | 90° Peel Strength | ≥ 15 N/25mm |
| Operating Temperature | -40°C to +150°C | Payment Terms | T/T |
| Air Permeability | Gurley：3 – 30 s/100ml @ 300 ml | Waterproof Rating | IP68 |
| Certification | IATF16949/ISO | Brand Name | OEM/ODM |
| Place of Origin | China | Model Number | OEM/ODM |
| High Light | External Road Acoustic Vent Membrane ，Noise Cancellation Microphone Vent ，EPTFE Acoustic Gore Vent | ||
EPTFE External Road Noise Cancellation Microphone Acoustic Vent
This EPTFE acoustic vent is engineered for external road noise cancellation (RNC) microphones placed in wheel wells, underbody, and near the exhaust system. These reference microphones must capture low-frequency road roar with high fidelity to generate accurate anti-noise signals, yet they face the most aggressive environmental attacks in the vehicle: high-pressure water, slush, de-icing chemicals, and flying gravel. The vent’s tailored acoustic resistance (500 Rayls typical) provides a precise acoustic path that preserves the microphone’s frequency response down to 20 Hz while blocking all liquids. The composite structure, bonding EPTFE to a heavy-duty mesh, resists puncture from pebbles and ice fragments. It endures steam jet cleaning (IP69K) and 1500-hour salt spray testing without any ingress, ensuring the RNC system operates correctly throughout the vehicle’s life. This vent is a key enabler for achieving luxury-level cabin quietness in mass-market vehicles.
RNC systems rely on accurate noise reference signals. If the external microphones become clogged with mud or water-soaked, the noise measurement becomes corrupted, and the cancellation algorithm may actually amplify noise. This EPTFE vent provides a permanently dry, calibrated acoustic path that keeps the microphone operating at its designed sensitivity. The robust physical protection means the mic can be placed closer to the noise source for better coherence, improving cancellation performance. The solution helps OEMs avoid the cost and weight of traditional passive sound deadening, contributing to lighter, more efficient vehicles.
| Parameter | Typical Value |
|---|---|
| Material | EPTFE + high-tenacity non-woven mesh |
| Acoustic Resistance (Rayls MKS) | 500 ± 50 |
| Frequency Response | ±1 dB from 20 Hz to 2 kHz |
| Water Entry Pressure | ≥ 0.2 MPa |
| IP Rating | IP69K (steam jet) |
| Puncture Resistance | > 40 N (MIL-STD-810 probe) |
| Salt Spray | 1500 hours no corrosion or ingress |
| Operating Temperature | -40°C to +115°C |
| Chemical Resistance | Calcium chloride, road salt, diesel, DEF |
Wheel well RNC reference microphones, underbody noise sensing mics, exhaust system acoustic monitoring, and chassis vibration sensors with acoustic inputs.
Low-frequency road noise travels as pressure waves through the EPTFE membrane to the microphone element. The vent’s calibrated acoustic resistance ensures a predictable, linear transfer function that the ANC system can rely on. Water, mud, and salt solutions are blocked at the surface because the pore size is too small to allow liquid penetration at typical driving pressures. The high water entry pressure ensures that even when submerged in a puddle at speed, water does not force its way through. The tough backing mesh absorbs stone impacts and prevents tearing.
Q1: Will water spray cause a crackling noise on the RNC mic?
A: No. The hydrophobic membrane prevents water from bridging across the microphone port, which is the typical cause of crackling. The mic signal remains clean.
Q2: How does the vent handle mud build-up?
A: Mud can coat the surface, but the hydrophobic property reduces adhesion, and high-pressure wash cycles easily remove it. The pores do not permanently clog because mud particles cannot penetrate the sub-micron structure.
Q3: Is the vent compatible with the low frequencies needed for road noise cancellation?
A: Yes, the vent is tuned to be linear down to 20 Hz. The membrane’s low stiffness ensures that long-wavelength sound passes through without phase distortion.
Company Details
Business Type:
Manufacturer,Exporter
Year Established:
2018
Total Annual:
1,000,000-2,000,000
Employee Number:
30~50
Ecer Certification：
Verified Supplier
Kunshan Xinzhenpin New Thin Film Material Technology Co., Ltd. Established in 2018, Kunshan Xinzhenpin is a specialized manufacturer dedicated to ePTFE waterproof and breathable membrane solutions. We operate a fully integrated production chain covering ePTFE raw membrane manufacturing, composite a... Kunshan Xinzhenpin New Thin Film Material Technology Co., Ltd. Established in 2018, Kunshan Xinzhenpin is a specialized manufacturer dedicated to ePTFE waterproof and breathable membrane solutions. We operate a fully integrated production chain covering ePTFE raw membrane manufacturing, composite a...
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