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BS 476-21: load bearing for fire resistance
BS 476-21 Fire test on building materials and structures-Part 21: Method for Determination of the fire resistance of load bearing elements of construction.
This part, together with BS 476: Parts 20, 22, 23 and supersedes BS 476: Part 8:1972, which is withdrawn. However, the latter will still be made available on request, since it is referred to in the building regulations and other legislative documents.
BS 476-21Focus on
Determination of the fire resistance of beams
Determination of the fire resistance of columns
Determination of the fire resistance of floors and flat roofs
Determination of the fire resistance of walls
The sample exposed to high temperature and pressure conditions, the test samples within the specified time bearing weight, integrity and insulation.
BS 476-21 fire resistance test time
30 minute
60 minute
90 minute
120 minute
150 minute
180 minute
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BS 476 reference standard
BS 476 Fire tests on building materials and structures.
BS 476-3:2004 external fire exposure roof test
BS 476-4:1970 Non-combustibility test for materials
BS 476-5:1979 Method of test of ignitability
BS476-6:1989 Method of test for propagation for materials
BS 476-7:1997 Surface spread of flame test for material
BS 476-11:1982 Method for assessing the heat emission from building materials
BS 476-12:1991 Ignitability of products by direct flame impingement
BS 476-15:1992 Method for measuring heat release of products-cone calorimeter
BS 476-20:1987 Method for determination of the fire resistance of elements of construction (general principles)
BS 476-21:1987 Methods for determination of the fire resistance of loadbearing elements of construction
BS 476-22:1987 Methods for determination of the fire resistance of non-loadbearing elements of construction
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Testing to：
Fire standard
