group-number
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Group number
NCC
means the number of one of 4 groups of materials used in the regulation of
fire hazard properties
and applied to materials used as a finish, surface, lining, or
attachment to a wall or ceiling.
Standards
a measure of the ignitability and heat release rate of a material, expressed as a number from 1 to 4
Source - AS 5637.1:2015: Determination of fire hazard properties
HB50
means the number of one of 4 groups of materials used in the regulation of fire hazard properties and applied to materials used as a finish, surface, lining, or attachment to a wall or ceiling
Source - BCA Vol 1 terminology