I was on a building site recently (not in NZ) which was using ACP for parts of the cladding. The panel had no markings that would allow me to trace back to what it should be. I asked for test certificates and a letter from the supplier stating that what they had supplied matched the test reports.
No letter or test report has been forthcoming. The client side project manager undertook an adhoc test on a panel off-cut and this was the result in the photo below. What do you think it indicates bearing in mind this is not a controlled test to any particular test standard? Prior to doing this test he took a cigarette lighter to an exposed edge of an offcut and it caught fire.
In contrast in NZ a contractor wanted to convince me of the safety of an FR core panel and took a blow torch to the panel. He succeeded to burn a hole in the panel where the flame impinged but did not get a lot of combustion beyond the direct flame area.