How to verify the quality of waterproof breathable membrane?

1. Appearance inspection

The appearance inspection of waterproof and breathable membrane mainly depends on whether the surface and back of the membrane are uniform, the gloss is sufficient, and there are no defects such as bubbles and spots. If there are obvious dents, scratches and other damage on the membrane surface, it is likely to leak water, which will affect its waterproof performance. If there are adherents on the membrane surface, it will affect the air permeability of the membrane surface, so pay attention to cleaning and maintenance.

2. Hydrostatic test

Hydrostatic testing is an important means to verify waterproof performance. Place the waterproof and breathable membrane on a flat surface, and apply a layer of cement mortar or tough polymer glue to make the surface smooth. Spread evenly a certain thickness of saturated salt water on the waterproof and breathable membrane, and observe the surface condition. Soaking time is generally 24 hours. During the hydrostatic test, it is necessary to observe whether there is leakage on the surface and back of the waterproof and breathable membrane. Leakage means that its waterproof performance is not good.

3. Air permeability test

The breathability test is a method to verify the breathability of the waterproof breathable membrane. Place the waterproof and breathable membrane in a closed container, add a certain amount of water into the container, make the waterproof and breathable membrane cover the water surface, seal the container and pressurize to assist the waterproof and breathable membrane to sweat. Measure the water vapor transmission rate of the area under the membrane during the air permeability test to measure the air permeability of the waterproof breathable membrane, so as to check whether its air permeability meets the standard.

4. Abrasion resistance test

Abrasion resistance is an important indicator of waterproof and breathable membranes, because waterproof and breathable membranes with poor wear resistance are prone to damage, cracks and other problems. The commonly used test method is the wear test. Put the waterproof and breathable membrane on the wear tester, set a certain weight and speed, and conduct a wear test for a certain period of time to observe whether there are wear marks, cracks and other damage on the surface of the membrane, and whether it affects the air permeability. make an impact.

5. Tensile strength test

Tensile strength is one of the important indicators of waterproof and breathable membrane, because the tearing force and kneading force faced by the waterproof and breathable membrane during use will affect it. The tensile strength test is to use a tensile testing machine to test the tensile strength index of the waterproof and breathable membrane, and evaluate the mechanical properties of the waterproof and breathable membrane according to the test results.

6. Environmental performance test

With the improvement of environmental protection awareness, people pay more and more attention to the environmental protection performance of waterproof and breathable membrane. Environmental performance testing is an important means to verify whether the waterproof and breathable membrane meets environmental protection standards. Common environmental performance test indicators include whether it contains harmful substances, whether it will pollute the environment, etc. Through the environmental performance test, it can be judged whether the waterproof and breathable membrane meets the environmental protection requirements.