How to identify the quality of waterproof vents

1. Laboratory testing

Test items: a. temperature resistance; b. water vapor throughput (that is, air permeability); c. hydrostatic pressure; d. anti-aging ability The real waterproof vents (breathing paper) are not compounded with glue, so the temperature resistance is- 40 to 100 degrees (EU CE standard, American ASTM standard). It is not produced with polyethylene or TPO film, so the air permeability should exceed 1500g/square/24 hours, and it is basically impermeable when produced with poly-Zene or TPO film. Hydrostatic pressure detection, the hydrostatic pressure of thin waterproof vents (breathing paper) is at least 1.5 meters or more, and the thick waterproof vents (breathing paper) is at least 2 meters or more. Anti-aging is a must, because PP material is easy to age under UV light, and some fake waterproof vents are produced with poor recycled materials, and this waterproof vents is easy to age and degrade during construction.

2. Simple hands-on inspection

On the surface, there are obvious pressure points on both sides of the waterproof vents, which is because the production process is compounded by hot pressing. Please note that it is not the dot pattern of the non-woven fabric itself, but the obvious overlapping dot pattern. Tear off the waterproof and breathable film, first of all, the middle-layer polymer layer should be milky white and very soft - the waterproof and breathable layer, because it is laminated by hot pressing, there should be pressure points on the film. In addition, lightly press the non-woven fabric and the membrane with your hands. If there is a sticky feeling, it can be concluded that it is adhered by hot melt adhesive, then this is a fake waterproof and breathable membrane. Because the hot melt adhesive adheres even at room temperature, the three layers of materials will foam and delaminate soon, and peel off automatically.