1.1 Where a product is required to have a surface
with low flame-spread characteristics, the product shall comply with
this part.
1.2 Where the primary deck coverings are required
to be not readily ignitable, they shall comply with this part.
1.3 Where a product of surface material is approved
based on a test of a specimen applied on a non-combustible and non-metallic
substrate, that product shall be approved for application to any non-combustible
and non-metallic substrate with similar or higher density (similar
density may be defined as a density equal to or greater than 0.75
times 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 a test result obtained after application
on a metallic substrate (e.g., thin film of paints or plastic films
on steel plates), such a product shall be approved for application
to any metallic base of similar or higher thickness (similar thickness
is obtained as a thickness equal to or greater than 0.75 times the
thickness of metallic substrate used during testing).