How to identify true and false waterproof breathable membrane

How to distinguish the authenticity of waterproof and breathable film ----- Meidebao Technology Co., Ltd. did the following test

Laboratory testing and testing items: a. Temperature resistance b. Water vapor throughput (ie, air permeability) c. Hydrostatic pressure d. Anti-aging ability

The true waterproof and breathable membrane is not compounded with glue, so the temperature resistance is -40,100 degrees (EU CE standard, American ASTM standard). It is not produced by polyethylene or TPO coating, so the air permeability should exceed 1500g/square/24 hours. It is basically airtight when it is produced by polyethylene or TPO coating. For hydrostatic pressure testing, the thin waterproof and breathable membrane has a hydrostatic pressure of at least 1.5 m and a thick waterproof and breathable membrane of at least 2 m. Anti-aging is necessary because PP materials are easily aged under ultraviolet light, and some fake waterproof and breathable membranes are produced with poor recycled materials. This waterproof and breathable membrane is easily aged and degraded during construction.

Looking at the surface of the simple hand-measuring surface, there are obvious pressure points on both sides of the waterproof and breathable membrane. That is because the production process is by hot pressing compounding. Please note that it is not the dot pattern of the non-woven fabric itself, but the overlapping dots. . To tear off the waterproof and breathable membrane, first of all, the middle layer of polymer layer should be a layer of waterproof and breathable layer which is very soft and milky white. Because it is composited by hot pressing, there should be a pressure point on the film. In addition, the non-woven fabric and the film are lightly pressed by hand, and if there is a sticky feeling, it can be concluded that this is a hot melt adhesive, and this is a fake waterproof breathable film. Because the hot melt adhesive sticks even at normal temperature, the three layers of material will blister and stratify automatically. Free phone