Besides the strength and skills of the anticipants themselves, outdoor sports also require the outdoor sportswear be capable of adapt to bad weather and complex geographical conditions in order to protect the personal safety of their owner. As a result of the factors of sports and outdoors, the requirements for outside sportswear are comparatively more strict. In outdoor exercises, there may be much more heat and sweat produced, so the clothes must have good heat dissipation and water vapor permeability; there'll be rainy, windy, snowy or foggy days in the open air, so the clothes ought to be water resistant.
The ability to resist water and to dissipate heat made by the body in the same time is hard to be obtained. Luckily, the sweat produced by human body is water vapor of single molecule state, while the rain and snow is liquid h2o drops in the state of aggregation. Volume of these two sorts of water differs a lot. Besides, liquid h2o has a characteristic called rod mill which can be the characteristic to aggregate itself in volume. If you mix a drop of detergent with a water drop, the water drop will scatter flatly immediately because the detergent can lower its surface tension.
Sportswear of water-resistant capability and drinking water vapor permeability perfectly makes use of this characteristic of h2o, surface tension. It applies PTFE (same chemical component but different physical structure with Polytetrafluor ethylene, PTFE, best corrosion resistance) coating on the surface of the fabric to enhance the surface tension of the fabric in order that the water drops keep themselves together instead of scattering and infiltrating into the surface. In this way, water drops will not manage to move through the clothes. Meanwhile, this PTFE coating is porous so the water vapor of single molecule state can with success undergo the tiny holes in the fabric and be dissipated to the surface of the clothes.
After large sum of movement, if we stop to rest in the rod mill, there may be water drops inside our clothes since it's cold outside the house and the sweat cannot be dissipated in time. It will make us feel not so comfortable. There is a type of film of polyurethane (PU) and nano-ceramic powder which can be coated on the surface of the fabric so to absorb the sweat vapor when we are sweating. This coating will steer clear of the drinking water vapor inside the clothes from turning into water drops because the water vapor has surpassed the saturated vapor pressure.
Besides this characteristic, PTFE has other special functions. For instance, since PTFE has low-loss and small dielectric constant, PTFE film is now the perfect insulation material to make capacitors, insulated cables and transformers. PTFE film is also one of the indispensible materials of making electronic components in aviation and space industry, etc. Many characteristics of PTFE make PTFE be extensively applied in so many fields like chemical engineering, petroleum, medicine, electronics and machinery.