I was in the city today, and dropped in to the best most complete professional building supply company, and having had little success over the telephone, got the expert to call their supplier. The most dense XPS foam they can get is the 60 PSI compessive stength. The 100 PSI is equivalent to the regular 5 pound divinicell in weight and general performance, so anything less is not a fair comparison. Unfortunately it is not available to me. Other sources of course have never heard of Highload 100 or Formular 1000. There is one manufacturer of EPS building products (bead board expanded to order on OSB), that also has sources for some of the less common XPS foams. I'll call them tomorrow and see what they can get.
Unfortunately the minimum thickness on these foams is 24.5mm (1 inch). It simply is not useful for many applications due to the low density and greater than desired thickness, and being available ONLY in full pallet lots. The additional thickness will give greater strength for a given layup so long as the foam does not shear away from the glass, but I don't think this is a real issue in the kinds of applications where it would be used. Resistance to localized compressive loads is the issue. I believe Divinicell has about 100 psi compressive load. The difference would have to be made up with more plies in areas where such loads are to be expected, and this would seem to negate most of the advantages.......
H.W.
On 06/07/2018 06:54 PM, Rob Denney harryproa@gmail.com [harryproa] wrote:
Still worth testing, but it is difficult to know what to test. I have an idea for building hulls with a work around for the weak shear properties of EPS. But the only way i can see to test it would be to build a hull and see what happens. This could be expensive and, to the engineering purist would not be conclusive.
I have ordered some of the 400, which I will infuse, bend, bash, and peel apart. If it is successful, I'll build a small tender, (or maybe a camping hull for Elementarry) to try the next stage.
If you want to send me a 12" x 12" sample of 25mm 700 I will repeat the tests and compare the results. Could you get 10 sqm and 100 sqm price for the 25mm 700, please? Ta.
On Thu, Jun 7, 2018 at 11:22 PM, '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
|eruttan,
|Thanks for the foam suppliers.
Happy to help!
| They import Dow Styrofoam from Europe, as
|no one makes it in Aus.
Disappointing.
| The HD-X is the 700 and has been pretty much superceded by the 400 for the usual uses (building, insulation, etc). They will supply the 700 if I buy a container full, as it comes from a different factory to the 400.
Well, groper (and the math)said the 400 was good to 676gsm per side. So, perhaps it is still worth testing? Although that 'superceded' line sounds like a marketing guy made it up.
If all the 700 leads goto to dead ends in Au, then perhaps us XPS curious could post you some.
What size would you need? Do you have any interest still?
Posted by: StoneTool <owly@ttc-cmc.net>
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