AS 5113:2016 Fire propagation testing and classification of external walls of buildings
If the external wall system to be classified comprises an inner leaf having the fire resistance levels specified by the National Construction Code (NCC) (but not less than –/30/30) and satisfying all other NCC fire related criteria for external walls and the external cladding is either directly fixed or fixed by means of a supporting framework, the test shall be performed with the cladding fixed to a representative wall system.
NOTE: A lightweight partition system faced with two 13 mm fire-rated plasterboard sheets may be used to represent the non-combustible inner leaf.
Where the external wall relies on the cladding system to contribute to the performance of the wall system, the entire wall system shall be subject to test.
NOTE: In these circumstances the impact of combustible construction on internal fires and the structural elements lie outside the scope of this Standard.
5.4.3 Classification criteria for ISO 13785-2 tests
All of the following performance criteria shall be satisfied:
(a) Temperatures 4 m above the opening measured 10 mm from the exposed specimen face shall not exceed 600°C for a continuous period greater than 30 s.
(b) Temperatures at the mid-depth of each combustible layer or any cavity 4 m above the opening shall not exceed 250°C for a continuous period greater than 30 s.
(c) Where the system is attached to a wall that is not required to have an FRL of –/30/30 or 30/30/30 or more, the temperature on the unexposed face of the specimen 900 mm above the opening shall not exceed a 180 K rise. Five thermocouples equally spaced at 500 mm centres with insulating pads, fitted in accordance with the requirements of AS 1530.4 for the measurement of surface temperatures shall be used.
(d) Where the system is attached to wall that is not required to have an FRL of –/30/30 or 30/30/30 or more, flaming or the occurrence of openings in the unexposed face of the specimen above the opening shall not occur.
(e) Flame spread beyond the confines of the specimen in any direction, as determined during the post-test examination, shall not occur. The examination shall include flame damage such as melting, charring but not smoke discolouration or staining of the surface, any intermediate layers and the cavity.
(f) Continuous flaming on the ground for more than 20 seconds from any debris or molten material from the specimen shall not occur.
(g) The total mass of debris falling in front of the specimen shall not exceed 2 kg. (The mass may be measured within 10 min of the end of the test).