PUW EPTFE Material Co., Ltd. It is a high-tech company integrating R&D, production, sales and service.
The company introduces international advanced technology and focuses on the development and application of expanded polytetrafluoroethylene (PTFE).
Model: PUWKK8.5-4.5-17
PUW Plastic Breather Valves are precision-engineered for modern battery systems, especially lithium-ion battery packs used in electric vehicles (EVs), energy storage systems, and portable electronics. These valves help manage internal pressure changes while providing waterproof, dustproof, and chemical-resistant protection, thereby ensuring battery safety, reliability, and performance over time.
| Product model | PUWKK8.5-4.5-17 | ||
| product type | Plastic vent valve | Body material | PC |
| Air permeability ml/ min@7kPa | ≥1800 | Degree of protection | IP67 |
| Air permeability ml/ min@7kPa | 250-750 | Degree of protection | IP68/IP6K9K |
| Thread length | / | Installation mode | / |
| colour | black | temperature range | -40°C~125℃ |
| Installation torque | / | Flame retardant grade | UL94-V0 |
| Application | LED outdoor lighting industry Automobile manufacturing industry Solar photovoltaic industry Electronic and electrical industry Communication equipment industry Security equipment industry | ||
As battery packs operate and charge/discharge, internal heat causes air expansion, increasing internal pressure. Without venting, this may lead to:
Housing deformation or rupture
Moisture ingress and condensation
Electrochemical degradation
Short circuits and safety risks
PUW’s breather valves offer automatic pressure equalization while keeping water, dust, oil, and gases out. This is crucial for:
Longer battery life
Reduced failure rates
Improved thermal and structural safety
Designed to withstand UV rays, rain, temperature shifts, and harsh outdoor conditions. Suitable for both indoor and outdoor battery systems.
Made from durable plastics with reinforced construction. Vibration-proof, impact-resistant — ideal for electric vehicles and industrial batteries.
Low-maintenance design with high-performance membranes ensures stable performance over time, even in demanding environments.
Support for various materials (PA66, PC, PP, etc.), colors, thread types, vent sizes, and membrane characteristics (hydrophobic/oleophobic). Logo and packaging can also be customized for OEM/ODM projects.
PUW breather valves integrate a microporous PTFE membrane inside a protective plastic housing. This structure enables:
Air pressure balancing: Allows air and gas to flow in/out
Water & dust barrier: Blocks contaminants (IP67–IP68 rated)
Thermal adaptation: Protects against heat-induced swelling or shrinkage
Chemical resistance: Durable in acid/alkali environments often present in batteries
The result is a more reliable, longer-lasting, and safer battery pack.
PUW plastic breather valves are widely used in battery pack enclosures for:
Battery modules in electric cars, e-bikes, scooters. Maintain enclosure stability under high-speed, high-temp conditions.
Stationary lithium battery storage, power walls, solar backup systems. Reduce condensation risk and increase safety.
Power banks, laptops, tablets. Keep moisture out and prolong battery health.
AGVs, forklifts, backup power units. Withstand industrial-level vibration and temperature changes.
Telecom batteries, surveillance power systems. Prevent fogging and water damage in exposed environments.
10+ years of experience in waterproof venting
International standard testing and certifications
Strong R&D support for customized requirements
Small MOQ, fast delivery, and global logistics
Professional team for technical and after-sales support
Q1: Can the valve be used in high-voltage EV battery packs?
Yes. Our breather valves are designed for both low-voltage and high-voltage lithium battery applications.
Q2: Will the membrane get clogged over time?
No. Our membranes are oleophobic and anti-clogging, ensuring consistent airflow while blocking contaminants.
Q3: Can I request a custom design?
Yes. We support full customization including vent shape, installation method, membrane type, and branding.
Q4: Do you offer samples for testing?
Yes, free or low-cost samples are available for compatibility testing.
Telephone: 0769-22850556
Mobile phone: +86 192 7996 3699
Email: puw@puw-eptfe.com
Address: No.20, Wanjiang Industrial Street, Wanjiang District, Dongguan City, Guangdong Province, China
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