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prepregs offered autoclave quality parts
under low pressure processing.
Taking this route, the company
gained independence from the
autoclave and opted out of the
never-ending spiral of always
requiring an even bigger
autoclave.
Overall, ACG’s VTM®240
series prepregs have
delivered significant cost
savings, reduced cycle times
and, more importantly, reduced
the risk factor by giving the
company total in-house process
control.
To give an insight into
the manufacturing
operation, Norma MPM
uses lasers to facilitate
ply positioning. Material
is manually laid-up into
complex shapes by
highly skilled staff and
then cured under
vacuum-only pressure in
one of a range of ovens, the
biggest one being 10m x 3.5m x
2.5m. Components are then
trimmed, machined and, in some
cases, metal features integrated,
or where necessary, co-cured into
the composite structure. Highly
complex parts are machined onsite
in their CNC workshop and,
finally, painted. Electromagnetic
capability (EMC) shielding is
applied in situ.
Norma recognises and appreciates the
excellent quality of ACG’s prepregs and
the Group’s flexible and rapid delivery
service, which even extends to custom
material manufacture, regardless of the
quantities required. This is further
extended to the exceptional technical and
after-sales support.
With approximately 220 employees, MPM
accounts for about half of Norma. This
gives Norma MPM full responsibility for
the overall performance of the company,
with the inherent rewards that this brings.
Norma MPM is fully focussed on serving
the defence market and growing into
other high-tech markets. Even with the
current financial climate as it is, the future
is bright, with the Group continuing to
experience growth. Just 10 years ago,
Norma employed 40 professionals, but the
Group now employees in excess of 400.
VTM®243FRB and VTM®244FRB are blackpigmented,
fire-retardant epoxy matrices
developed for low-cost manufacturing of
medium-to-large composite structures by
vacuum-only (OOA) processing. Both
matrices have a long, 21 day, work-life at
room temperature. They may be cured at
temperatures between 65°C (149°F) and
180°C (356°F), and are capable of service
temperatures up to 150°C (300°F) in dry
conditions.
The two resins differ in rheology and tack,
but not in mechanical performance of the
cured laminates they produce.
VTM®243FRB is higher in viscosity and
lower in tack, for lightweight
reinforcements, and high quality surface
plies. VTM®244FRB has been
specifically formulated for heavy
reinforcements and for rapid lay-up
bulk plies. The two resins can be cocured
in the same laminate, and
also used in standard prepreg
format or in ACG’s ZPREG®
selective impregnation formats.
Images copyright and courtesy of
Norma MPM and Thales.
Page 11
ACG’s LTM®123 Prepreg in Orbit on ‘TopSat’ Space Camera
ACG continues to supply its LTM®123
structural composite carbon fibre prepreg
material for high resolution cameras
under development at the Rutherford
Appleton Laboratory (RAL). LTM123 was
recently used on a remote sensing orbital
imager capable of producing 2.5 metre
resolution panchromatic imagery. The
camera, part of the TopSat mission, a
collaboration between four UK
organisations, RAL, Surrey Satellite
Technology Ltd (SSTL), QinetiQ and
Infoterra, provides a rapid response, high
resolution imagery feed service to groundbased
stations using a low cost satellite
system.
The main benefit of adopting ACG’s
LTM123/M55J for space applications is its
excellent dimensional stability; in a quasiisotropic
layup, LTM123 has near-zero coefficient
of thermal expansion (CTE).
Moisture expansion in space applications
can present major problems, but ACG’s
LTM123, a cyanate ester component
prepreg, presents the ideal solution. End
user tests have shown that the material is
resistant to permanent deformations
caused by vibratory loads, partly due to the
low cure temperature and, therefore, low
residual stresses. It is also worth noting
that this material has developed an
excellent reputation in the European space
industry, making it an ideal candidate for
future projects. In fact, LTM123’s
application history dates back to 2003
　
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