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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This part, together with BS 476: Parts 20, 22, 23 and supersedes BS 476: Part 8:1972, which is withdrawn.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 476-21 Focus 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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Testing to：
Fire standard
