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 The Nonwoven core and liner for hand lay-up and spray-up
processes
Coremat is a polyester nonwoven that contains microspheres and is
used as a thin core (bulker mat) or print blocker (liner) in fibre
reinforced laminates, manufactured in Hand Lay-Up or Spray-Up processes.
Coremat should always be fully impregnated with resin the microspheres
in Coremat prevent excessive resin up-take. The most important reasons
to use
Coremat are:
* Weight saving
* Resin and glass saving
* Stiffness increase
* Fast thickness build-up
* Excellent surface finish
Coremat® Xi
 Coremat Xi is the world's standard for bulker mats. The
Coremat resin consumption is about 600 grams per mm thickness. It
contains a resin indicator which changes colour to show that resin has
been applied to the Coremat.
Coremat Xi is very soft and pliable when it is wet and therefore very
suitable for complex shapes. Key properties Xi:
* Resin indicator
* Excellent impregnation
* High drapeability in resin
Coremat® XM
Coremat XM has a low resin take up: 500 gram of resin per mm
thickness. It is therefore suitable for weight critical applications.
The hexagonal cell pattern results in a very consistent thickness in the
product. Coremat XM has a very high wet tensile strength; it is
therefore often used in applications where mats are pre-wetted outside
the mould.
Key properties XM:
* Honeycomb structure for excellent drapeablity
* Extra resin saving
* High wet strength
 Coremat® XM 10
Use Coremat XM 10 to replace plywood of rigid materials like foam or
plastic cores.
Coremat has good screw retention and does not have rot issues, contrary
to wood.
Coremat saves weight
Coremat as a core material is used in the center of a laminate. Coremat
can replace much heavier solid glass layers. Impregnated Coremat has a
density of 610 kg/m3 (38 lb/ft2), while Impregnated Chopped Strand Mat
has a density of 1,500 kg/m3 (94 lb/ft3). This is a weight saving of
60%.
Coremat saves resin and glass
Coremat contains less resin than CSM: 1 mm (0.039 inch) of Coremat
contains 0.6 kg/m2 (2.0 oz/ft2) while 1 mm (0.039 inch) of CSM contains 1
kg/m2 (3.31 oz/ft2). Although Coremat usually replaces glass layers, it
should always be used between glass layers.
Coremat saves labor
One layer of Coremat builds up thickness rapidly. Coremat is 1 to 10 mm
(0.04-0.39 inch) thick. While multiple layers of glass fiber are
required to achieve these greater thicknesses, One layer of Coremat is
sufficient.
Coremat is an excellent print blocker
Coremat can be used to block “print-through” of glass reinforcements and
cores, especially when dark gelcoat surface finishes are used. Coremat
is most often applied against the “skin coat” to create a superior
surface finish on hull sides.
Download:
Technical characteristics:
Coremat® Xi - 89991.pdf
Coremat® XM - 89990.pdf
Certificates Lloyds:
Coremat® Xi - Certificaat Lloyds Xi.pdf
Coremat® XM - Certificaat Lloyds XM.pdf
Certificate ABS:
Coremat® Xi - Certificate ABS Coremat Xi.pdf
MSDS:
Coremat® Xi - MSDS - Coremat Xi.pdf
Coremat® XM - MSDS - Coremat XM.pdf
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