What is the role of waterproof breathable membrane

The waterproof breathable membrane is mainly embodied in waterproof breathable, dustproof breathable and bacterial breathable prevention, and is widely used in automobile, medical treatment, environmental monitoring, packaging, electronic sensor protection and other fields. The waterproof breathable membrane is mainly used for waterproof and breathable clothing. It is called "breathable material" in foreign countries.

The breathable membrane mainly uses a microfiltration membrane with a pore size between 0.1-10 μm. For breathable membranes, there are two important values for water inlet pressure and air permeability. Under normal circumstances, the two are in a competitive relationship, and high air permeability means low water inlet pressure. The breathable membranes mainly use hydrophobic membranes and oleophobic membranes, and in most cases, oleophobic membranes are used. Although ePTFE has natural hydrophobic and oleophobic properties, it will be wetted and penetrated when it encounters some liquids such as alcohols, cleaning agents, and lubricants with low surface energy. The oleophobic film has a lower surface energy and can resist the infiltration of these liquids.

Since many devices and applications require a relatively closed environment, they cannot be affected by external dust, water, and bacteria. If it is designed to be particularly closed, under the objective conditions of ambient temperature and latitude changes, it will cause pressure changes. Usually, such pressure changes will have agglomeration effect, which will cause damage to the shell and the sensitive parts inside. The use of ePTFE breathable membrane can continuously balance the pressure difference, reduce the cost of component design, and ensure the reliability and reliability of the product.

At present, ePTFE breathable film is mainly used in: automotive ventilation, medical ventilation, electronic sensor ventilation, packaging ventilation, and packaging ventilation includes household packaging, agricultural packaging and industrial packaging and other fields.