WHY MEMBRANE0 pages

TECHNICAL DATA SHEET
Fabrics
Membrane surface filtration has been used successfully in
baghouses for a number of years. During that time, it has proven
that it can be an economical choice for product collection and
emission control.
Because of demonstrated economic advantages, surface
filtration media has consistently increased its market share.
These gains have caused the manufacturers and suppliers of
fabric media to begin thinking surface filtration. This is evident
by the recent introduction of new treatments and foam coatings,
mostly dispersant types, such as acrylic and Teflon®, on fabric
media. They do not eliminate the need for a subsurface dust
cake.
The major market for the membrane surface media has
historically been retro-fitting existing baghouse systems which
were experiencing operating difficulties or needed improvements
because of process changes. This experience has also proven
valuable in recognizing the importance of bag/baghouse
interface and many of the things which will prevent any filter
media from giving the expected level of performance.
COST VS. VALUE
The term “relatively expensive” is quite often applied to surface
filtration media. This is true only if the initial price is considered.
Before deciding this, all costs or savings related to its use should
be considered. Therefore, cost of surface filtration media should
be evaluated on its potential economic return rather than this
initial price.
WHAT IS SURFACE FILTRATION?
It is the deposition of all dust, both coarse and fine, on the surface
of the filter media, and it eliminates the need for a primary dust
cake to be formed on the interstices of the filter media as is
necessary with industrial fabric filter media. Surface filtration is
accomplished by utilizing a tight, yet porous membrane which
gives excellent dust cake release to prevent high operating
pressure losses.
WHAT IS THE ePTFE MEMBRANE MEDIA & HOW IS IT
DIFFERENT?
The filtering surface of membrane is a very thin, extremely
smooth and microporous film of expanded PTFE.
For durability, the ePTFE membrane is bonded to the surface of
a base fabric (the backing material). Many users may remain
with the same base media as already installed (e.g. polyester
felt, aramid felt, woven fiberglass, etc).
WHY
MEMBRANE?
Exploring the Benefits of
Surface Filtration