Specifications

hot waterproof breathable membrane improve building durability by protecting wall sheathing and framing from moisture.

 

 

1. Waterproof breathable membrane principle

 

Waterproof breathable membrane includs microporous membrane, hydrophilicity membrane and microporous hydrophilicity membrane. Microporous membrane is a very thin layer of polymer membrane, there are lots of microcellular on the surface, which diamteres less than 2μm, water drop diameter is about 100μm, water vapor diameter is about 0.0004μm. So it's available for waterproof and breathable.

 

Nelumbo breathable membrane is made by two layers of non-woven fabrics and one layer of microporous polymeric membrane in the middle. The three layers are thermally laminated without using any chemicals such as glues. Because of the excellent performance at water resistance and vapour permeability, Nelumbo breathable membrane allows potentially harmful moisture vapour to escape from within a building to the outside air, while remaining rain and water-resistant.

 2. Application of Waterproof breathable membrane

 

  Nelumbo waterproof breathable membrance are mainly used for the wall and roofing.

   

Item		Specific
Weight (g/m2)		100	130	170
Water Vapour Transmission (g/m2.24h)		2500-3500	2500-3500	2500-3500
Resistance to Water Penetration (mm)		1500-3000	1500-3000	1500-3000
Tensile Strength (N/50mm)	CD	>140	>150	>170
	MD	>160	>170	>200
Low Temperature Flexibility (°C)		-40°C	-40°C	-40°C
UV Exposure		4	4	4