MEMBRANE COMPARISON. Laminated fabrics are either
microporous or hydrophilic or sometimes, a combination of the
both.
The microporous system with membranes such as Gore-Tex®
works on the difference between sizes of the water molecules
(which are large) and the moisture/ body vapor molecules (which
are small). The membrane contains millions and millions of
micropores, which are too small for the large water molecules to
penetrate, while the smaller moisture molecules are pushed
through by body heat pressure. This membrane’s main advantage is
excellent breathability in dry conditions. A disadvantage is
that the breathability is easily blocked by dirt, salt, etc, so
keeping the clothing clean is very important, otherwise the
breathability decreases.
The hydrophilic system with membranes such as Sympatex®
is based on a chemical chain reaction between small moisture
molecules and the non-porous membrane. Molecules of perspiration
are absorbed and transported to the outside of the fabric, while
water molecules cannot penetrate the film, due to the lack of
micropores. This membranes main advantage is a more efficient
moisture transportation in humid conditions or when raining. The
waterproof capability is better under special conditions since
there are no micropores that can be enlarged and thereby start
leaking.
