Learning the HARD way...
Join Date: Jan 2007
Location: Boston / Ft Myers Area
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IF you are interested,
My friend's company has been providing the core material for the Composite Deck House of the US Navy's new DDG Destroyer. I know that they went through an exhaustive certification and qualification process. This material "is a completely isotropic material that provides excellent strength and stiffness, finding use in critical areas where the performance of lesser core materials such as Balsa, Honeycomb or blown foams may not be sufficient." I know that it is a resin/macrosphere matrix, and that its characteristics are not affected by the presence or absence of water. If I have to do a re-core, I plan on using it (good enough for the USN is good enough for me!)
The material is available in different densities, each with different compressive strength and shear characteristics:
19 (± 1) 23 (± 1) 28 (± 1) 33 (± 1)
Compressive Strength ASTM D 1621
1,400 psi 2,100 psi 3,200 psi 4,700 psi
Compressive Modulus ASTM D 1621
53.1 ksi 81.3 ksi 86.1 ksi 90.3 ksi
600 psi 900 psi 1300 psi 1600 psi
If you would be interested in trying this material, PM me.