Waterproof and breathable, air cannot come in underwater but air can come out

Waterproof and breathable membrane (breathing paper) is a new type of polymer waterproof material. In terms of production technology, the technical requirements of waterproof and breathable membranes are much higher than those of ordinary waterproof materials. At the same time, from a quality perspective, waterproof and breathable membranes also have functional characteristics that other waterproof materials do not have.

Basic concepts/waterproof breathable membrane

While the waterproof and breathable membrane enhances air tightness and water tightness, its unique breathable performance can quickly discharge water vapor inside the electronic structure and protect the performance of the surrounding electronic products, thereby truly reducing the loss of electronic components and avoiding unnecessary costs. , and perfectly solve the new environmentally friendly and energy-saving material that is waterproof, breathable and sound-permeable.

Working principle/Waterproof breathable membrane

In the state of water vapor, the water particles are very small. According to the principle of capillary movement, they can smoothly penetrate into the capillary tube to the other side, thus causing vapor permeability. When water vapor condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets (the water molecules “pull and compete” with each other), the water molecules cannot smoothly break away from the water droplets and penetrate to the other side, which is to prevent Water penetration occurs, making the breathable membrane waterproof.

Application Industry Classification/Waterproof Breathable Membrane

Car exterior lighting:

Cars are widely used in modern society, and different weather and road conditions will be encountered during transportation. Car lights are always exposed to the external environment. Dust, mist, rain, snow, road debris and mud will all affect the lighting of the car lights, thereby affecting the safety of the vehicle’s driving process. A sudden drop in external temperature will lead to a drop in internal pressure, making the device prone to inhaling pollutants and increasing fogging, eventually causing lamp failure. It can provide long-lasting protection for car lights from external water vapor, dust, oil and other dirt. At the same time, the product’s unique breathable function enables gas exchange as the pressure changes, thereby reducing the pressure on the seal and extending the service life of the product.

1. Reduce fogging of headlights

Effective ventilation can significantly reduce fogging, up to 50%.

Universal mounting methods reduce product design complexity.

Reliable performance and reduced testing costs.

2. Pressure balancing of tail lights, fog lights and auxiliary lights.

The superior performance and unique design of automotive waterproof and breathable membranes allow you to save costs in every aspect of manufacturing.

The cost of the seal design is reduced and the housing material is reduced, thereby reducing tool design and cost.

The breathable design won’t build up pressure and can be cured in place with sealants and adhesives, reducing assembly time.

Reliable performance over the life of the product.

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Outdoor lighting fixtures:

Potential Problems: Outdoor light fixture housings are subject to changes in ambient temperature and pressure.

Temperature changes, dust, dirt and moisture can have a considerable impact on the electronic components of outdoor lighting fixtures. For example, rainfall may cause the luminaire housing to cool rapidly, creating a vacuum of 200 mbar (3 psi) or more within the housing. This will seriously affect the performance of the fixture’s internal components.

Solution: Maintain pressure balance inside and outside the casing through constant ventilation.

After installing the Puwei waterproof and breathable membrane on the outdoor lamp cover, the pressure difference caused by changes in external temperature will no longer have a negative impact on the cover, because the waterproof and breathable membrane can quickly balance the shell when the ambient temperature and pressure change. Internal and external pressure.

Effectively prevent fogging and condensation on the cover.

Effectively resist the effects of acid rain, salt and other corrosive liquids.

The breathable membrane has extremely high air permeability, which means that the inside of the cover can continuously exchange gas with the outside, thereby effectively preventing harmful gases generated by the battery from accumulating in the cover.

Greatly reduce the stress on the cover sealing strip, thereby minimizing the probability of failure and extending the service life of the cover.

Maintenance is simple. After installing the breathable membrane, it is still very convenient to open the cover and access the internal components.

Easy installation brings great convenience to design and production.

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Sensor device:

Potential Problem: The sensor housing is exposed to changing temperatures and pressures.

Temperature changes, dust, dirt and moisture can have a significant impact on the sensor’s electronic components. For example, the cleaning process can cause the temperature of electronic equipment housings to drop significantly.

A sharp drop in temperature can cause a vacuum of 200mbar (3psi) or more within the housing.

Solution: Keep the pressure balance inside and outside the shell through constant ventilation.

Waterproof and breathable products can effectively resist the adverse effects of pressure differences caused by temperature changes. The use of waterproof and breathable membranes can withstand ambient temperature and pressure.�Quickly balance the pressure inside and outside the shell when it changes.

In gas and electrochemical sensors, waterproof vents prevent dust, dirt or liquids from intruding into the sensing head. At the same time, the ePTFE membrane allows gas to pass through the membrane immediately, ensuring that the sensor response speed remains constant and preventing errors and delays in measurement results.

Key Benefits

Protect the sensor from contaminants, water, salt and other corrosive liquids to ensure accurate sensor measurement and stable performance.

By quickly achieving pressure balance inside and outside the sensor housing, the stress on the housing sealing strip is reduced.

Rapidly restore ventilation after exposure to liquids.

Microporous membrane structure provides excellent breathability.

Easy installation brings great convenience to design and production.

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Communication equipment:

Potential Problems: Equipment used in the telecommunications industry is subject to rapid fluctuations in ambient temperature, is exposed to a variety of particles, and is constantly exposed to wind, rain, sunlight, and other climatic conditions. For example, when equipment such as tower-mounted antennas with active electronics installed is in operation, heat will accumulate inside the equipment casing. This will cause an increase in pressure, placing greater stress on the housing seal. In addition, a sudden heavy rain or strong wind may cause the temperature to drop suddenly, resulting in a vacuum of 200mbar (3psi) or even greater inside the equipment housing, which will also subject the housing sealing strip to greater stress. If the pressure inside and outside the casing cannot be balanced, water, moisture, dust and dirt in the external environment will enter the interior of the casing through the sealing gap. This may adversely affect the performance of the communications equipment, resulting in more repair work or greater rework costs.

Solution: Keep the pressure balance inside and outside the shell through constant ventilation.

After waterproof and breathable membrane products are installed on outdoor communication equipment, the pressure difference caused by temperature changes will no longer have a negative impact on the equipment shell, because waterproof and breathable products can quickly balance the pressure inside and outside the shell when the ambient temperature and pressure change.

Key Benefits

Effectively resists the effects of water, salt and other corrosive liquids.

A membrane that allows water vapor to pass through can prevent condensation from occurring to the greatest extent.

Reduce the stress on the housing sealing strip by quickly achieving pressure balance inside and outside the housing.

Easy to maintain; even if breathable products are installed, it is still very convenient to open the device and maintain internal components.

Easy installation brings great convenience to design and production.

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Precision electronics industry:

Potential Problems: Electronic equipment is often exposed to dust or splashes.

Mobile phones and other portable wireless devices are generally used in harsh environments and may come into contact with water and dust, which can damage sensitive components.

Solution: Dustproof and waterproof sound-permeable membrane products provide dust and splash protection.

Vents are installed on equipment ports and provide pressure relief and balancing for equipment exposed to dust, splashes, and temporary immersion in water.

Waterproof vents provide a dust and splash barrier for audio equipment without causing a significant decrease in sound transmission, integrity or quality. In addition, breathable products prevent the intrusion of various everyday liquids, such as carbonated drinks and coffee. Puwei waterproof and breathable products can maintain sound quality while providing a beautiful cover and building a waterproof barrier against the above factors.

Prevent sparks or current caused by static electricity from causing unnecessary damage to the equipment.

Key Benefits

Using sound-transparent materials to ensure high-quality sound transmission.

The extremely high air permeability of the breathable film enables constant internal and external gas exchange, effectively preventing the accumulation of harmful gases released by the battery.

Effectively prevents condensation and display fogging.

Reduce the stress on the housing sealing strip by quickly achieving pressure balance inside and outside the housing.

Protects internal components from contaminants and liquids used in daily life.

Easy installation brings great convenience to design and production.

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Solar equipment:

Potential Problems: Outdoor solar junction box enclosures are subject to changes in ambient temperature and pressure.

Temperature changes, dust, dirt and moisture can have a considerable impact on the electronic components within solar components. For example, rainfall may cause the luminaire housing to cool rapidly, creating a vacuum of 200 mbar (3 psi) or more within the housing. This will seriously affect the performance of the components inside the case.

Solution: Maintain pressure balance inside and outside the casing through constant ventilation.

After installing a waterproof and breathable membrane on the outdoor solar housing, the pressure difference caused by changes in external temperature will no longer have a negative impact on the housing, because the waterproof and breathable membrane can quickly balance the pressure inside and outside the housing when the ambient temperature and pressure change. .

Key Benefits

Effectively blocks moisture, salt and other corrosive liquids, allowing sensitive parts of the equipment to be safely exposed to the outdoors.

Breathability can be restored quickly after contact with water, oil and other liquids.

The dense and even distribution of micropores can effectively block dust while being waterproof and breathable, and the protection level can reach IP68.

Balance pressure to prevent air and moisture around sealing components from entering the body and protect sealing integrity.

Protects components from weather and withstands immersion in water and other liquids.

The protected parts are easy to clean and are not affected by corrosive pollutants, ensuring the performance and service life of the parts.

UV resistant, extremely chemically inert, and resistant to extreme temperatures.

Thin, lightweight, and good concealment, it brings convenience to design and production. It is an ideal product for waterproofing and breathability.

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Chemical and medical equipment:

Chemical industry: Waterproof and breathable technology can meet the requirements of a variety of industrial applications. Its products include: sealing materials for chemical manufacturing, industrial equipment closures, bottle caps, filter bags for pollution control, breathable products for industrial cleaner containers, etc. . Puwei Company customizes various products for chemical equipment manufacturers and large-scale end customers, which have both extremely high value and good performance.

Medical: Medical implants work with the body’s own tissues and aid in recovery and, in many cases, restoring the body’s normal functions. These implants allow doctors to achieve good results and provide patients with mental peace. Promicro’s products provide new solutions for vascular, endovascular, interventional, general surgery, cardiothoracic, oral and plastic surgery treatments. Waterproof, breathable membranes used in medical equipment and surgical gowns create a reliable barrier against viral and bacterial contamination without affecting airflow.

Main product features

Waterproof, dustproof and breathable safety level reaches IP65K-IP68K

The microporous structure expanded polytetrafluoroethylene waterproof and breathable membrane [12] has the following characteristics:

1 Water-repellent and oil-repellent

2Promote the dispersion of moisture and steam

3Extremely chemically inert

4Won’t fall off

5 Anti-UV

6 Resistant to extreme temperatures.

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Printing industry:

Scope of application: Ink cartridges, toner cartridges, industrial printers and other products

Waterproof and breathable products can be used in printers and their components to balance the pressure difference between inside and outside, prevent external contaminants from entering the printing system, and prevent ink and toner from leaking. In addition, Puwei waterproof and breathable products can be used in high temperature environments and can withstand the temperature rise caused by long-term continuous printing. In this way, it not only ensures the continuity of printing, but also improves the uniformity of printing colors, thereby comprehensively improving the printing quality, thereby enhancing the product credibility and brand influence of printer manufacturers and printing consumable manufacturers. The waterproof and breathable products used in the printing industry are mainly waterproof and breathable valves and adhesive-backed diaphragms.

Inkjet printers often encounter the problem of discontinuous printing. This is caused by the imbalance of pressure difference between the inside and outside of the cartridge. As printing progresses, the space without ink in the ink cartridge becomes larger and larger, and the pressure of the air in the ink cartridge becomes smaller and smaller, resulting in a larger and larger pressure difference with the outside world, thus blocking the smooth flow of ink. Waterproof and breathable products help cartridge manufacturers solve this problem. The excellent breathability of waterproof and breathable products can balance the pressure difference between inside and outside, thereby ensuring continuous and even output of ink. At the same time, waterproof and breathable products can also help release the gas in the ink, thereby improving the quality of the output ink. In addition, the surface of the waterproof and breathable film used in the ink cartridge has been specially treated so that it will not be wetted by ink containing surfactants, so it can still maintain stable and excellent breathability even after contact with the ink. The waterproof and breathable products used for ink cartridges can withstand the high temperatures caused by long-term continuous printing of inkjet printers. The performance of the waterproof and breathable film will not change as the temperature of the printer and ink cartridges increases, thus ensuring the quality of long-term continuous printing.

The toner cartridge is one of the core components of a laser printer, and the breathable device of the toner cartridge is also critical. Like ink cartridges, toner cartridge breathable products can balance the pressure difference between the inside and outside of the toner cartridge, thereby ensuring the continuity and stability of toner output. At the same time, waterproof and breathable products can also prevent toner leakage and external pollutants from entering the toner cartridge. In addition, water vapor can freely enter and exit the waterproof and breathable membrane, thereby controlling the humidity inside the toner cartridge.The function of � thus ensures the quality of the toner after long-term use and storage of the toner cartridge. Waterproof and breathable products for toner cartridges can maintain excellent and stable air permeability even when exposed to high concentrations of toner. In addition, waterproof and breathable products can also withstand the temperature rise of the toner cartridge caused by continuous printing of laser printers, thereby ensuring the reliability and stability of long-term continuous printing of laser printers.

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Security industry:

The zoom camera will inhale a certain amount of air when adjusting the lens, and the air will bring in water and dust, which will pollute the lens. Waterproof and breathable products can block water and dust in the air, but allow air to circulate freely. This prevents the lens from being contaminated during zoom adjustments. Underwater cameras have extremely high waterproof requirements, but surrounding sounds must be allowed to enter the camera. This places extremely high demands on protective products. Waterproof and breathable products solve this contradiction very well. Waterproof and breathable products have extremely high water pressure resistance while allowing sound to pass through, so they perfectly meet the requirements for protective products for outdoor cameras.