|the recognition of the burning behaviour of materials and their ability to extinguish if ignited. Materials are classified as in the definitions in this standard, when tested in accordance with IEC 60695-11-10, IEC 60695-11-20, ISO 9772 or ISO 9773|
NOTE 1 When applying the requirements in this standard, HF-1 class foamed materials are regarded as better than those of class HF-2, and HF-2 better than HBF.
NOTE 2 Similarly, other materials, including rigid (engineering structural) foam of class 5VA are regarded as better than those of class 5VB, 5VB better than V-0, V-0 better than V-1, V-1 better than V-2, V-2 better than HB40 and HB40 better than HB75.
NOTE 3 Similarly, other materials of class VTM-0 are regarded as better than those of class VTM-1 and VTM-1 better than VTM-2.
NOTE 4 Materials of flammability classes VTM-0, VTM-1 and VTM-2 are considered to be equivalent to materials of flammability classes V-0, V-1 and V-2, respectively, but only for their flammability properties. Their electrical and mechanical properties are not necessarily equivalent.