2024-03-14

British Standard: BS476-7 – Flame retardant testing of building materials, fire testing

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The following content will explain the flame retardant and fire test standard BS 476-7 for building materials:

BS476-7 Fire retardant testing of building materials – Standard name:

BS476-7: Fire Tests on Building materials and structures – Method of test to determine the classification of the surface spread of flame of products
BS476-7: Flame retardant and fire protection test of building materials and building components – Determination of product flame surface burning level

BS476-7 Fire retardant testing of building materials – Overview of the standard:

BS476-7 is used to determine the lateral extension of a sample surface and determine the combustion rating based on speed and extension length. BS 476-7 is mainly used to determine the flame spread on exposed surfaces of walls and ceilings.

BS476-7 Flame retardant and fire protection test of building materials - Scope of application of the standard:

surface of wall material
Exposed surface of insulation material
Exposed surface of ceiling material

BS 476-7 Fire retardant testing of building materials – Standard analysis:

This method is used to measure the propagation of flame along the surface of a vertical plate specimen, and the measured results are suitable for comparing the fire performance of exposed surfaces of walls or ceilings. The test device is shown in the figure. This method also ignites the sample in the combustion box, and the ignition source is a gas radiant panel and a medium-sized gas blowtorch.

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According to the test results, the tested materials are divided into 4 levels according to the table. Class 4 materials have a high fire risk and are not allowed to be used as building materials.

level	Flame propagation degree during test 1.5 minutes		Degree of flame spread at the end of the test
level	limit value mm	Allowable deviation value mm	limit value mm	Allowable deviation value of a test piece mm
1	165	25	165	25
2	215	25	455	45
3	265	25	710	75
4	Values exceeding level 3

Relevant test standards

BS 476 : Fire testing of building materials and structures
BS 476-3 : Fire test of building materials and components - Fire test of exposed parts of roof
BS 476-4 : Fire testing of building materials and structures - Material non-flammability testing
BS 476-5 : Test method for flammability of building materials
BS 476-6 : Fire testing of building materials and components. Part 6: Test methods for fire spread of products
BS 476-7 : Fire testing of building materials and components. Part 7: Test methods for determining the surface spread classification of product flames
BS 476-11 : Fire test of building materials and components. Part 11: Determination method of thermal radiation of building materials
BS 476-12 : Fire test of building materials and components. Part 12: Test method for flammability of products in direct contact with flames
BS 476-13 : Fire test of building materials and components Part 13: Test method for flammability of products exposed to thermal radiation
BS 476-15 : Fire testing of building materials and structures - Test method for product heat release rate
BS 476-20 : Fire resistance testing of building materials and components. Part 20: Test methods for fire resistance of building components (general principles)
BS 476-21 : Fire resistance testing of building materials and components. Part 21: Test methods for fire resistance of load-bearing components
BS 476-22 : Fire test method for non-loaded building elements
BS 476-23 : Fire test of building materials and components. Part 23: Test method for the contribution of components to the fire resistance of components
BS 476-24 : Fire testing of building materials and components. Part 24: Test methods for fire resistance of ventilation ducts
BS 476-31.1 : Fire testing of building materials and components - Method of measurement of smoke penetration through door and window assemblies. Measurement method at room temperature
BS 476-33 : Fire testing of building materials and structures - Physical indoor testing of surface products

Tag: British Standard: BS476-7 – Flame retardant testing of building materials fire testing

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