Waterproof breathable plug

II. Core Working Principle

Its technical core lies in the use of a microporous membrane made from ePTFE (expanded polytetrafluoroethylene).

1.  Microporous Structure:
This membrane contains tens of thousands of micron-sized or even nano-sized pores.
2.  Surface Tension and Hydrophobicity:
    · These pores are much smaller than water droplets (water molecules are small but exist in the form of droplets).
    · Due to the material's extreme hydrophobicity (water-repellency), water molecules cannot wet or penetrate this membrane. The surface tension of water causes it to form droplets, preventing passage through the micropores.
    · Similarly, it effectively blocks oils and other contaminants.
3.  Gas Molecules Pass Freely:
Air molecules (such as O₂, N₂, CO₂) are very small and can easily pass through these microporous channels, enabling instantaneous pressure equalization.

III. Main Functions and Advantages

1.  Pressure Equalization:
Prevents the formation of a pressure differential (positive or negative pressure) between the inside and outside of a sealed enclosure.
2.  Water and Dust Protection:
Provides a high level of IP (Ingress Protection) rating, commonly such as IP67, IP68, etc., preventing leakage during transportation and storage, which could pose safety hazards or cause environmental pollution.
3.  Enhances Sealing Performance:
Allows for the use of more comprehensive and economical sealing solutions without worrying about pressure buildup causing packaging container rupture or swelling.