In sealed automotive lighting systems, rapid temperature changes during driving create significant internal pressure differentials, leading to condensation, fogging, seal failure, and reduced visibility. SST-Porous® Vent Caps solve these issues by allowing precise air and moisture exchange while blocking water, dust, and contaminants.
By matching different ePTFE membranes, the vent caps achieve customizable gradients of air permeability and moisture permeability to meet various lighting requirements. The compact structure ensures easy installation and high tolerance, while maintaining stable protection levels even in harsh road environments. Available with full engineering support from SST’s expert team — from membrane selection to final design.
SST is committed to delivering professional waterproof, dustproof, and breathable solutions that enhance lighting reliability, prevent fogging, and extend the service life of automotive lamps.
SST-Porous ®Component BD T series waterproof and breathable cap product structure diagram
SST-Porous®Component BDT series waterproof and breathable cap products Typical sizes
1. Breathability
The SST-Porous® Component BDT Series Breathable Caps are available in different sizes depending on the ventilation volume. The polypropylene (PP) outer cover is color-coded in black, gray, and brown for easy identification.
The product categories are described in the following table:
| PP outer cover is black – small breathability | PP outer cover is black – medium breathability | PP outer cover is brown – large air permeability | ||
| Typical breathability | gt; 500 ml/min/cm2 | gt; 10000 ml/min/cm2 | gt; 15000 ml/min/cm2 | |
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Note: <&== &span> ※ The air permeability test is the air permeability before use ※ Test pressure difference, at ΔP = 70 mbar, RT |
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2. Waterproofness
The SST-Porous® Component BDT Series Breathable Cap features an SST-Porous® e-PTFE breathable membrane. Thanks to its unique network structure composed of “fibers” and “nodes,” the membrane provides excellent breathability while also delivering superior waterproof performance.
| PP outer cover is black – small breathability</td > | PP outer cover is gray/brown<&== &td> | |
| Hydrostatic pressure | gt; 500 kPa | –(no data) |
| IP protection level<& ==&td> | IP54, IP65/ IP66 (depending on the installation structure), IPX7, IPX8, IP69K<&== &td> | IP54 |
| Note:
※ The hydrostatic pressure test is the test value before use, unit: kPa |
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3. Hydrophobicity and oleophobicity
To meet diverse application requirements, the SST-Porous® e-PTFE breathable membrane is available in two types: water-blocking (hydrophobic) membrane and super water-blocking (oleophobic) membrane.
When exposed to low-surface-tension liquids or potential oil contamination, the SST-Porous® Component BDT Series Breathable Caps can effectively provide both hydrophobic and oleophobic protection.
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※SST-Porous® component BD T series breathable capFeatures: Oleophobic properties: Level 8 oleophobic |
4. High and low temperature resistance
The SST-Porous® Component BDT Series Breathable Caps can withstand a wide temperature range from -40°C to +120°C.
※ The usage temperature of the product mainly depends on the final usage temperature of the base material of the PP outer cover, thermoplastic elastomer or breathable film;
※ For specific temperature requirements, SST application engineers can provide breathable cap products with a wider operating temperature range.
5. PFOA-free
The material used in the SST-Porous® s-PTFE breathable membrane differs from the conventional PTFE raw material used in e-PTFE membranes. It is produced from a suspension process and does not require the emulsifier perfluorooctanoic acid (PFOA), which is suspected of being carcinogenic.
Therefore, when the SST-Porous® s-PTFE breathable membrane is adopted in the component, the SST-Porous® Component BDT Series Breathable Caps are free of PFOA.
For applications using SST-Porous® e-PTFE breathable membranes, environmentally friendly emulsifiers can be selected in the PTFE dispersion process, ensuring that the SST-Porous® Component BDT Series Breathable Caps are also PFOA-free.
6. Customizability
The SST-Porous® Component BDT Series Breathable Caps can be customized according to customer requirements. Customers may select different thermoplastic elastomers, inner hole installation diameters, PP outer cover colors, air permeability levels, protection ratings, and other specifications.
| Product ID | BD T78-01-45-black | BD T78-01-500-grey | BD T78-01-1000-brown | BD T78-01-45-blue-0 | |||||||||||||||||||||||||||||||||||
| Color | Black | Grev | Brown | Blue | |||||||||||||||||||||||||||||||||||
| Operating Temperature | -40-120°C | -40-120°C | -40-120°C | -40-120°C | |||||||||||||||||||||||||||||||||||
| Typical air permeability | 70±30 ml/min@7kpa | 1600±300 ml/min@7kpa | 5000+1000 ml/min@7kpa | 70±30ml/min@7kpa | |||||||||||||||||||||||||||||||||||
| Protection level | IPX7/IPX8 | IPX1~X4 | IPX1~X4 | IPX7/IPX8 | |||||||||||||||||||||||||||||||||||
| Surface properties | Hydrophobic | Hydrophobic | Hydrophobic | Hydrophobic and oleophobic | |||||||||||||||||||||||||||||||||||
| Mounting hole diameter | 7.6±0.2mm | 7.6±0.2mm | 7.6±0.2mm | 7.6±0.2mm
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※Supply methods
| Supply method | Description of supply |
| Large packaging | 1000/bags |
| Small packaging | 500/bags |
| Sample Pack | 5/ bags |
