The keychain is a decorative item that hangs on the key ring. Choosing the key with your favorite keychain not only reflects your personal taste and personality, but also brings you a happy mood. There are many kinds of key chains, such as cartoon shape, brand shape, miniature object shape, etc., and there are many qualities, such as copper, aluminum, rubber , plastic and so on. The keychain can also be used as a small gift to a friend or yourself to express your heart.
It is a special new polymer material with extremely fine microporous structure on the surface. Because the minimum diameter of water droplets is about 0.02mm and the diameter of water vapor molecules is only 0.0000004mm, there is a great difference between the two diameters. According to the principle of concentration gradient differential diffusion, Water vapor can freely pass through micropores, while liquid water and water droplets cannot pass through breathing paper materials because of their surface tension. Therefore, breathing paper has excellent waterproof and vapor permeability.
Breathable Membrane,Breathable Roof Membrane,Breather Membrane For Walls
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