Why Foam?
Pipercross reticulated foam is created by a chemical reaction,
then placed in a gas filled combustion chamber where
controlled explosions burn away cell walls in the material
to form a skeletal cellular structure which is held to
a strict quality control.
The process ensures that the foam consists of tiny open cells
which trap contaminants. The cell size of the foam, it's porosity,
is measured in PPI, Pores Per Inch. Pipercross air filters use up
to six layers of foam with varying porosity which descend in
pore size in the direction of airflow. Some layers are flame laminated
with a nylon mesh in between, to produce a fail-safe interface
without restricting air passage through the material - as would
be the case with conventional bonding methods.
