waterproof breathable membrane

Waterproof breathable membrane, also called breathing paper, is a new type ofPolymer waterproof material。

Waterproof and breathable membrane has functional characteristics that other waterproof materials do not have——Breathable, which can balance the air pressure inside and outside the product and release heat.

This means that there is no need to worry about rupture or deformation of electronic products caused by different internal and external air pressures during use.

picture1-1 Waterproof breathable membrane (Source: Internet picture)

The principle of waterproof and breathable membrane

In the state of water vapor, water particles are very small.

according tocapillary movementAccording to the principle, it can smoothly penetrate into the capillary tube to the other side, so that the vapor permeability phenomenon occurs.

When water vapor condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets (water molecules interact with each other)"pull against balance"),Water molecules cannot smoothly break away from the water droplets and penetrate to the other side, which prevents water penetration and makes the breathable membranewater prooffunction。 

picture2-1Waterproof and breathable membrane on the back cover of electric toothbrush

Mainly used inOn the microphone holes and earpieces of 3C digital products, such as TWS headsets, mobile phones, watches and other products.

Air tightness and breathability testing methods

 So how to test the waterproofness and breathability of a waterproof and breathable membrane?

Air tightness testingHai Ruisi is hereIn the first half of 2021,Specially developed for waterproof and breathable membrane testingHai RuisiHW real water leak detection instrument。

itIt has high sensitivity and accuracy, and can analyze the leaked data.Quantify,accomplishAutomatic judgmentwaterproof breathable membraneWhether the waterproof performance is qualified.

by usingreal waterContact the membrane to be tested, and then monitor the drop in water pressure. If it exceeds the set value, the waterproofness of the membrane is unqualified.

picture3-1 Hirays real water detector

The HW True Water Detector enables quantifiable test results, which improves the current shortcomings of manual confirmation and makes automated testing, judgment and production of products with waterproof and breathable membranes possible.

While improving efficiency for our customers, we also ensure product quality.

Breathability testingHai RuisiHW real water leak detection instrumentIt not only has the function of product simulation and detection of water pressure, but also can identify whether the waterproof and breathable membrane is leaking under the action of simulated water pressure.

picture3-2 Real water detector for waterproof and breathable membrane on the back cover of electric toothbrush

During the air extraction stage in the above-mentioned testing process, the air permeability of the waterproof breathable membrane can be judged by observing the upper and lower air pumping limits set according to product parameters.

When pumping out air, if it exceeds the lower limit, it means that the breathable membrane is not breathable. If it exceeds the upper limit, the air permeability is too large and cannot meet the requirements.

For those with high accuracy requirements, you can useFlow type detection instrument,passflowTesting method to determine the breathability of the waterproof breathable membrane.

picture3-3 Air tightness testing of the waterproof and breathable film on the back cover of the electric toothbrush

Choose the right instrument and the test will not be tiring!More than 2,000 customers have witnessed the development of Hirays,More than fifty engineersAlways available.7 days fast delivery, is a commitment to you and a requirement to ourselves.Choosing Haris is a choiceStablizeandhigh quality。