Subject: Re: [harryproa] Re: extruded polystyrene core questions
From: "=?UTF-8?B?QmrDtnJu?= bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 5/11/2018, 4:16 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

I compared mainly the density, since it seems to be fairly proportional to strength (compressive, tensile, shear). The cheap xps seems to be about 25-30 g/cm3. And the strongest xps I've found had 45g/cm3. The other foams where 80-100g/cm3. So 1/4 was from 25/100, and 1/2 from 45/80.

With what do you agree?

What's the spec of the xps used in aircraft construction?

On Fri, May 11, 2018, 05:20 '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 



On May 9, 2018 3:54:58 PM UTC, "Björn bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au> wrote:
>So 1 sqm 80g/cm3 is ~36 AUD or ~20 GBP for 12mm, while 1 sqm 100g/cm3 Armacell PET is ~11 GBP for the same thickness. To be compared with 1-2 GBP for XPS in standard density (~1/4 of the strength).

I'm not sure here, but i have no idea what grade you are getting of XPS... And if you are paying 1-2 GBP, there is no way it is 1/4 the strength on H80. Do you mean 1/4 the strength of the PET?

And which grade of PET? Because they have some comparable to H80

And, I know we are kinda being informal, but by strength, you mean compressive strength, right?

I am using compressive strength, for the same reasons groper did in that boatdesign.net thread.

Now I am not sure that's right. But given all those disclosures...

Yes, Björn, i agree completely.

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