The panels in the fire test were clad with aluminium commonly used in cool room construction.
This link provides a paper that discusses the fire issue of insulating foams in more detail:
It is the melting and dripping of XPS then vaporisation that causes the rapid spread of fire. PVC burns more like wood with charing and does not melt and flow.
I have two types of XPS insulating foam at home. Both purchased within the last two years in Australia. Neither are self extinguishing. Both drip as they burn.
The H80 PVC foam I have here is self-extinguishing and does not melt when it burns.
The linked paper indicates the importance of the overall building system. Building a one-off boat using XPS is not going to be a proven system from a fire rating perspective.
On 25 Jul 2018, at 3:05 am, '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:Um, Rick, you have again confused EPS and XPS. That is EPS on fire. EPS burns great, as it is made from PS soaked in benzene. XPS is not.
That video is unsourced bs from a long time ago. Every cold room would have an interior wall surface (often both sides) that is fire proof, typically stainless steel, and one wall missing to feed flame growth is silly. Cold rooms are sealed to keep cold in. Flames wont last long in them, and everything is cold.
Any building material will have ASTM fire ratings for buildings, as the XPS we have discussed does.
But yes. If one needs to reduce fire risk for boats, PVC is a better material than XPS.
Also, if you feel that oil slicks are a common enough, where you sail, to put your encapsulated in epoxy core at risk, then PVC is also a better material choice.
If these are very low risks for you and a lighter cheaper boat is more important, perhaps consider XPS, if it is available in the strengths you need.
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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