Functional fabrics
Wind resistance
The PTFE membrane has a networked multilayer microporous structure, with pores that are not
permeable. When wind contacts the surface of the film, it encounters obstruction and changes
direction or turns back. Air is difficult to penetrate, so external airflow cannot directly
contact the human body.
thermal insulation
The PTFE membrane has a strong vapor permeability, which can quickly transmit the steam emitted
by the human body to the microporous membrane outside, preventing water vapor from condensing
into liquid water and reducing heat transfer by water. At the same time, the wind cannot
penetrate, effectively preventing air convection, thus making the film have good windproof and
heat-retaining effects. Tests show that the heat-retaining effect of the 4M-PTFE laminated
fabric in a wind speed of 25m/s is 30-40% higher than that of traditional down jackets.
Waterproofing properties
The Giamor Membrane 4M-PTFE membrane can withstand water pressure of around 20,000mm water column
(i.e. it can only penetrate when the pressure is greater than 18 meters of water column), the
pore size of the membrane micro holes is about 0.2um, while the diameter of the hair-like rain
droplets is 400um, the diameter of the larger rain droplets is around 3000um, and the diameter
of the heavy rain droplets is more than 6000um. Therefore, the pore size of the membrane micro
holes is 1/1000 to 1/20000 of the diameter of water droplets, and at the same time, the surface
energy of PTFE is low, and it is naturally hydrophobic, so even the smallest raindrops cannot
pass through the membrane micro holes.
water vapor permeability
The test for water vapor permeability is internationally regulated by using the indicator of
water vapor resistance, i.e., the smaller the resistance, the higher the air permeability. The
test value of Jia Membrane 4M-PTFE fabric is 32,603 g/m2·24hr, with a daily water vapor
permeability greater than 32 liters, which is more than 10 times that of common fabrics.