Subject: Re: [harryproa] XPS in use 3D core
From: "=?UTF-8?B?QmrDtnJu?= bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 3/2/2019, 7:20 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Hej Ryan

Maybe you didn't notice, but there was a long long discussion about using XPS as a core material on this forum some months ago. Both pure XPS foam, or with a honeycomb like pattern cut into the boards. We where discussing doing it ourselves to get "poor man's 3d core".

I compared low density PVC foam(h45-ish) to high density XPS and found the XPS to be tougher in compression, validating what another guy had done 10 years ago. More tests needs to be done, like comparing shear strength. The guy built a trimaran hull out of it, but he was not planning to use XPS for the deck, but plywood. 

What was the price of 3dcore boards? The pattern/voids in the boards might consume more epoxy during infusion than pure PVC foam, increasing price and weight. Did he account for that?


On Sat, Mar 2, 2019, 04:57 ryanonthebeach@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

Guys 


Visiting a boat builder yesterday, who is building a mostly carbon cat for himself for the local regattas and pushing the limits a bit with some bleeding edge materials to reduce weight.  


What was interesting is he's trying out an XPS core from a german company 3D Core.

He is not using it in production yet, will use his boat as a guinea pig first but was happy with the test panels, with a basic workshop (non scientific) test comparison against PVC 60/80. I pressed the foam with my nail and it imprints easily, quite soft.

Seems that, to up the compression strength etc. they create channels "3D honey comb" spaces for the resin to fill, which takes away some of the wight difference. But according to his test panels he's shaved the weight down to about 75% of PVC foam. He's using this for the cabin top only at this point.

Attached is a pic after bagging, with fairing starting.

Data and tests here:

https://3d-core.com/en/products/foam-types.html

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