No evidence that either of the above products is suitable for filling around metallic pipes, I'm afraid! In my experience, once you do any digging these foams are almost always tested in narrow, deep gaps in masonrywork - sometimes with a rockwool backing; not a very challenging application from a fire resistance point of view! As I said, hot metal tends to degrade the foam and reduce its fire resistance significantly.
I'd want to see positive evidence of fire resistance (see Clause 1, Appendix A in the England & Wales Approved Document B for the sort of evidence we should be looking for - basically fire test reports or independent assessments). Manufacturer's data sheets are routinely either incomplete or very misleading about things like fire resistance performance. I well remember a "4 hour" fire-resisting mastic that I discovered was actually tested applied over a gap that had been completely stuffed with compressed ceramic fibre (the stuff they line furnaces with). Frankly, chewing gum would have been no less effective!
