Weld Type (No Adhesive Backing)
Product Overview
Waterproof breathable membranes are primarily made of expanded polytetrafluoroethylene (e-PTFE), a film formed by a special process into an ultrafine microporous structure. Water droplets, dust, and other fine particles cannot pass through, while air and vapor can. e-PTFE films can also be laminated with other breathable materials (such as nonwovens and woven fabrics) to create a wider range of waterproof breathable membrane materials.
These materials are mainly used to equalize pressure inside and outside sealed cavities while providing waterproofing, dust protection, and even oil resistance. Applications include household and consumer electronics, automotive lighting and electronics, outdoor devices, packaging, and transportation.
Product Applications
Application Methods for Waterproof Breathable Membrane Materials
Waterproof breathable membrane materials can be die-cut to the size required by the customer, then bonded to sealed housings with adhesive, or fused to plastic housings (such as PBT-30GF, PA-30GF) by heat welding or ultrasonic welding.
Brady offers a high-performance waterproof breathable membrane product line and professional selection, design, and processing solutions to help improve product reliability and service life.
Adhesive Type
Various Vent Valves
Automotive Applications (Lights, Motors, Sensors, …)
Motors, sensors, and other electronic parts in vehicles need sealing against water, dust, and oil to prevent circuit failure, while also equalizing pressure differences from temperature changes so long-term negative pressure does not compromise the seal. Waterproof breathable membranes are therefore essential on these components.
Installing a suitable waterproof breathable membrane on headlights helps moisture escape quickly to reduce fogging and impact on internal electronics, while also equalizing pressure and providing waterproof, dustproof protection.
Other Modular Waterproof Breathable Membrane Applications
Plug-in Vent Cap (for Automotive Lights)
Threaded Vent Valve (Plastic / Metal)
Bayonet Vent Valve (Plastic)
Packaging Vent Gasket / Vent Valve
Product List
Membrane Structure Type-1 : 100% e-PTFE
| Brady Model | Color | Support Material | Thickness (mm) | Airflow (ml/min/cm²@7KPa) | Water Entry Pressure (KPa for 30s) | Oleophobicity Grade | Service Temperature |
|---|---|---|---|---|---|---|---|
| DB-5467W | Dark gray | None | 0.19 | 400 | >50 | None | -40 ~ 260°C |
| DB-5467G | Dark gray | None | 0.19 | 700 | >60 | ≥ 7 | -40 ~ 260°C |
| DB-5817 | White | None | 0.2 | 800 | >50 | ≥ 7 | -40 ~ 260°C |
Membrane Structure Type-2 : e-PTFE / PET woven
| Brady Model | Color | Support Material | Thickness (mm) | Airflow (ml/min/cm²@7KPa) | Water Entry Pressure (KPa for 30s) | Oleophobicity Grade | Service Temperature |
|---|---|---|---|---|---|---|---|
| DB-5446 | White / Black | Yellow PE woven | 0.12 | 500 | >150 | ≥ 6 | -40 ~ 125°C |
| DB-5439 | White / Black | Black PE woven | 0.12 | 1300 | >110 | ≥ 7 | -40 ~ 125°C |
| DB-5435W | White / Black | Black PE woven | 0.12 | 2000 | >50 | None | -40 ~ 125°C |
Membrane Structure Type-3 : e-PTFE / nonwoven
| Brady Model | Color | Support Material | Thickness (mm) | Airflow (ml/min/cm²@7KPa) | Water Entry Pressure (KPa for 30s) | Oleophobicity Grade | Service Temperature |
|---|---|---|---|---|---|---|---|
| S-3990 | White | PET nonwoven | 0.17 | 200 | >300 | ≥ 6 | -40 ~ 125°C |
| DB-5435 | White | PET nonwoven | 0.18 | 800 | >150 | ≥ 7 | -40 ~ 125°C |
| DB-5444 | White | PET nonwoven | 0.12 | 2000 | >80 | ≥ 7 | -40 ~ 125°C |
| DB-5466 | White | PET nonwoven | 0.15 | 5000 | >30 | na | -40 ~ 125°C |
| DB-5467 | White | Polyolefin nonwoven | 0.12 | 6500 | >20 | na | -40 ~ 100°C |
Membrane Structure Type-4 : e-PTFE / PET nonwoven / e-PTFE
| Brady Model | Color | Support Material | Thickness (mm) | Airflow (ml/min/cm²@7KPa) | Water Entry Pressure (KPa for 30s) | Oleophobicity Grade | Service Temperature |
|---|---|---|---|---|---|---|---|
| DB-5434 | White | PET nonwoven | 0.35 | 750 | >150 | ≥ 7 | -40 ~ 150°C |
Expert Advice Fast Response
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