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Re: Polyurethane foam insulation
Fire retardant treatments for PU does exist, but usually only improve (slightly) the ignition and flame spread properties. Once involved in a fire it does little. Don't quote me on this since I haven't studied furniture fires in a little while, but as far as I know the improvements are pretty minor. The retardants used also contain bromines or other toxic chemicals so now the fire effluents are even worse (probably matters little since you'd likely be dead if you inhale significant smoke in a boat anyway). As you said polymers also release HCN gas which can increase CO uptake and knock you unconscious at low concentrations, much lower than for CO. Again if you breathe enough that this is an issue it might be too late anyway, though not always. In fire investigations we do look at HCN concentrations in victims.
Thank you Scandium, the foam used was Touch and Foam and is described as CCMC Listed, Class 1 fire resistance. Do you have information on its safety?