Subject: Re: [harryproa] polyisocyanurate
From: "Rob Denney harryproa@gmail.com [harryproa]" <harryproa@yahoogroups.com.au>
Date: 10/6/2018, 8:07 AM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 




On Sat, Sep 29, 2018 at 2:04 PM '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
 

Rob, et. al.;

Teach me about polyisocyanurate composits.

I have been reading about polyiso and found this.
http://blog.twinsprings.com/wp-content/uploads/2016/06/EA-2.-Cold-Weather-Performance-of-Polyisocyanurate.pdf
Thought it was neat enough to share. It's not boat related, except for, perhaps, Steinar.

I have a local source for it. They do the string cutting like you described, Rob. Mostly for pipes, but will cut sheets. Seems the compressive performance is comparable to 700kpa XPS in the 4#/sq ft (sorry for the units), and close to H100 in the 6#.

Sounds impressive.  What does it cost?    If you can get some samples, I will test them.  Tried melting plastic into fibreglass.  Nowhere near the resin fibre ratios (or the pressure) of vac bagged epoxy, but the bond is excellent and tougher than epoxy.  Also tried heating the surface of foam to make a tough outer layer.  Worked well, but the exchange is over 10:1 bubbles to solid, so probably not viable for much more than furniture.  Probably better ways to achieve it.

They also have a laminate version that has less course bubbles, and slightly less compressive strength.

Which made me wonder if the Divinycell has large bubbles or small fine bubbles like the 700kpa XPS. Rob you have seen both, please advise when you get a chance.

H 80 is much bigger bubbles than the Foamular 400.  H100 about in the middle.  Bubble sizes differ a lot between sheets of the 'same' weight.  


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Posted by: Rob Denney <harryproa@gmail.com>
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