Heat Resistant board

[seriph1]

I imagine stone would be the same along with tempered/heat proof/resistant glass if non-combustibility were the determining factor

[johnc]

No Seriph, been there done that. Tempered glass needs the fireproof backing if within 200mm, don't know about stone though.

John.

[totoblue]

I imagine stone would be the same along with tempered/heat proof/resistant glass if non-combustibility were the determining factor

I don't non-flammability is the sole determining factor. Insulation is also important. Steel or glass could theoretically transmit heat to flammable insulation in the wall cavity and set it on fire.

Stone *may* do the job but I doubt whether a natural and thus variable product can be tested to AS 5061.

The Energy Safe Victoria (and presumably equivalent in other states) website says what is ok.
http://tinyurl.com/gey6d
The only product listed, that doesn't have to comply with the standard, is ceramic tiles of a certain minimum thickness, or an unspecified method of mounting the glass that comes with documentation to the fact that it avoids the combustible surface reaching a certain temperature.