On May 9, 2018 11:45:54 AM UTC, "Björn bjornmail@gmail.com [harryproa]" <harryproa@yahoogroups.com.au> wrote:

 

>And, it seems, Rob gets 3/4" sheets of H80 for ~80$? So I, also, just do not see any reason to look at anything else at that price point.

Is that 80 AUD per sheet? What is the size of the sheet?

On Wed, May 9, 2018 at 1:40 PM, '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:

 

Why are you making this personal?

>I think you should build from XPS, and I say that without any intention of being snide.

How does a conversation on thinking about a topic become 'you should do it'?

>You have faith in XPS, you feel the cost savings is worthwhile, and you want to give it a go.

Putting aside religious issues, when have I said I have faith in XPS? Why do you have such devotion to H80 when Rob has said its choice was a simple economic one?

>If you wanted to convince /me/

I don't.

>We could argue for weeks about the other points you bring up, but I don't see the utility in that.

That must be why you have not addressed any of them? But I'll try to articulate the utility of them below.

>Maybe one of us is right

I do not know how I could be right. I have not advocated a position to be right about.

>Finnfoam may have loads of experience with thermal cycling, but if XPS doesn't have the elongation and impact resistance of linear PVC or SAN, then Finnfoam's experience, while valid, doesn't really apply to my choice.

I am not interested in your choice. I am interested in the thinking that lays out your argument. And examining that.

You are asserting that several properties of linear PVC are important.

You are not advocating the use of H200. Why not? It is, in all of your criteria, better.

We have not shown that any of these properties are needed at the level, and corresponding cost, of the material selected. Again, the designer has said he made these choices due to economics.

And, it seems, Rob gets 3/4" sheets of H80 for ~80$? So I, also, just do not see any reason to look at anything else at that price point. (As an aside, public pricing for HIGHLOAD 1000 is about 200$ for 2")
>From Rob's point of view, (my guess) H80 may be more than needed, and a little heavier, but the price is optimal, so go with that.

Public pricing I can find says 1/8" sheets are twice that plus shipping. With that as a cost driver, energy put into alternative materials make sense..

You are articulating a materials standard that is not backed up by the need at hand. And you are not addressing the need at hand. Which is the premise of my original question.

Saying that one material is better than some other material is irrelevant, as that is always true.