Where a product is approved based on a test of a specimen
applied on a non-combustible substrate, that product should be approved
for application to any non-combustible substrate with similar or higher
density (similar density may be defined as a density ≥ 0.75 x the
density used during testing) or with a greater thickness if the density
is more than 400 kg/m3. Where a product is approved on
the basis of test result obtained after application on a metallic
substrate (e.g. thin film of paints or plastic films on steel plates),
such a product should be approved for application to any metallic
base of similar or higher thickness (similar thickness is obtained
as a thickness ≥ 0.75 x the thickness of metallic substrate used
during testing).
In the first line of the first sentence, the word “or"
should read “of".
Qsb means an average of three values of average
heat for sustained burning, as defined in paragraph 9.3.