Waterproof and breathable membrane temperature resistant

The real 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 with polyethylene or TPO coating, so the air permeability should exceed 1500g/square/24 hours. Production with polyethylene or TPO coating is basically impermeable. Hydrostatic pressure test, the hydrostatic pressure of the thin waterproof and breathable membrane is at least 1.5 meters, and the thick waterproof and breathable membrane is at least 2 meters. Anti-aging is necessary, because PP material is easy to age under ultraviolet light. Some counterfeit waterproof and breathable membranes are produced with poor recycled materials. This waterproof and breathable membrane is easy to age and degrade during construction.

On the surface, there are obvious pressure points on both sides of the waterproof and breathable membrane. That 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 membrane. First, the middle polymer layer should be a milky white and very soft waterproof and breathable layer. Because it is compounded by hot pressing, there should be pressure points on the membrane. In addition, lightly press the non-woven fabric and membrane with your hands. If you feel sticky, then you can conclude that it is a hot melt adhesive, then this is a fake waterproof and breathable membrane. Because hot-melt adhesive sticks even at room temperature, these three layers of materials will soon foam and layer and peel off automatically.