Feature 2 | MARINE COMPOSITES Diab delivers lighter weight deck solution
Developments in the field of sandwich composite solutions are largely shaped by the pursuit of high performance at the lowest possible weight. Diab has made advances in this area with the introduction of Matrix 7-7 to its Divinycell range of core materials, Nicky Stuart reports.
construction; Matrix 7-7 is the latest addition to the family, introduced at JEC 2010 in Paris. Matrix 7-7 has been designed to provide high performance at the lowest possible weight. The resulting benefits of this include lower fuel consumption, higher application efficiency, lower environmental impact and decreased lifetime cost. Each of these factors is essential to companies who offer applications using sandwich composite designs. Matrix 7-7 meets the performance and
D
strength criteria set for marine decks by several regulatory bodies, such as Det Norske Veritas (DNV), qualifying it as probably the lightest foam core material available today that fulfils these standards. Matrix 7.7 differs from the rest of the Divinycell range in Diab’s approach to its development. Te company began by studying the requirements for the marine sector from DNV and other regulators, and looked to produce a material with the lowest possible density while remaining within industry regulations. Te raw material used in Matrix 7-7 is
52 kg/m3
polyvinyl chloride (PVC) based and has a low carbon footprint compared to core materials such as PET, as well as lower energy consumption in manufacturing than other raw materials used in foam cores, making it a more environmentally sound product. Te Matrix 7-7 material is also recyclable* and material waste can be used in other applications such as: insulator, ‘plinth’, material commonly used in the electrical trade, in road fills and as a raw material in cement. With a nominal density of only , Matrix 7-7 meets the minimum
requirements on core materials in classification societies such as DNV
46
(compression strength 0.6MPa and shear strength 0.5MPa). This enables boat designers to significantly decrease deck weight and increase competitiveness.
Mechanical properties Unit Density
iab’s Divinycell is a range of polymer foam cores used in composi te sandwich
Matrix 7-7 has been designed to provide high performance at the lowest possible weight (Credit: Diab Group).
As Matrix 7-7 is still a relatively new
addition to the market, at the time of writing Diab were unable to name any of its customers that had ordered the
kg/m3
Compressive strength MPa Compressive modulus MPa Tensile strength Tensile modulus Shear strength Shear modulus Shear strain
MPa MPa MPa MPa %
Unit
Min 47
0.6 50
1.2 52
0.6 14 8
Nom 52
0.8 60
1.5 65
0.7 17 14
Table 1: Mechanical properties of Divinycell Matrix 7-7 (SI Units). Characteristics
Thermal conductivity Water absorption
Water vapour permeability
W/mK kg/m2 • 10-8
Coefficient of linear expansion • 10-6 Dimension stability temperature °C Continuous temp. range
Max. processing temperature
°C °C
Value 0.0285 0.005
m2 °C
/s 4.0 40 *)
-200 to +70 +90
Table 2: Characteristics of Divinycell Matrix 7-7 (SI Units). Ship & Boat International July/August 2010
Test procedure ISO 845
ASTM D 1621 ASTM D 1621 ASTM D 1623 ASTM D 1623 ASTM C 273 ASTM C 273 ASTM C 273
Test procedure ASTM C 518
ASTM C 272 A ISO 12572
DIN 53424
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