Table 1: Consumable
materials and equipment required for vacuum
A sacrificial open weave
fibreglass or perforated heat-set nylon
ply placed between the laminate and the
bleeder/breather to provide the textured
and clean surface necessary for further
lamination or secondary bonding.
non-structural fabric designed to absorb
excess resin and reactants from the laminate.
This may also act as the breather cloth.
loose weave or non-woven porous material
use to provide a gas flow path over the
laminate both to permit the escape of
air, reactants, moisture and volatiles
and to ensure uniform vacuum pressure
across the component. This may also
act as the bleeder cloth.
(perforated) sheet of material placed
between the laminate and the mould surfaces
to prevent adhesion.
used to define the edge of the component
mould or tool placed on top of the laminate
inside the bag to define the second surface.
Generally hard rubber profiles incorporated
in the bag to consolidate the laminate
at sharp radii.
membrane which permits a vacuum to be
drawn within the bag.
strip used to bond the bag to the tool
and provide a vacuum seal.
connector through the bagging film to
permit a vacuum to be drawn.
link between the breach unit and the vacuum
container in the vacuum line to collect
any excess resin before it can damage
the vacuum pump.
Generally a high-volume pump (absolute
vacuum is rarely required) suitable for
continuous running. For some slow-curing
epoxy resins twenty-four operation may
Generally clock-type gauges attached via
a breach unit connection.