The following content will explain the flame retardant fire test standard BS 476-7 for building materials:--- CE certification agency
Ä BS476-7 Fire retardancy test for building materials - Standard name:
ü BS476-7: Fire Tests on Building materials and structures – Method of test to determine the classification of the surface spread of flame of products
ü BS476-7: Fire resistance test for building materials and building elements – Determination of the degree of surface burning of the product
Ä BS476-7 Fire retardancy test for building materials - Standard overview:
BS 476-7 is used to determine the lateral extension of a sample surface and to determine the burning grade based on the velocity and extension length. BS 476-7 is primarily used to determine the flame extension on exposed surfaces of walls and ceilings.
Ä BS476-7 Fire retardancy test for building materials - Standard application scope:
ü Exposed surface of wall material
ü Exposed surface of insulation material
ü Exposed surface of ceiling material
Ä BS 476-7 Fire retardancy test for building materials - Standard analysis:
This method is used to determine the spread of flames along the surface of vertical plate-shaped specimens. The measured results are suitable for comparing the fire resistance of exposed surfaces of walls or ceilings. The test device is shown in the figure. This method also ignites the specimen in a combustion box, and the ignition source is a gas radiation panel and a medium-sized gas blowtorch.
According to the test results, the tested materials are divided into 4 levels according to the table. Grade 4 materials have a high fire hazard and are not allowed to be used as building materials.
|
level
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Flame propagation degree at 1.5min test
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Flame spread at the end of the test
|
|
Limit value
mm
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Allowable deviation value
mm
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Limit value
mm
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Permissible deviation of a specimen
mm
|
|
1
|
165
|
25
|
165
|
25
|
|
2
|
215
|
25
|
455
|
45
|
|
3
|
265
|
25
|
710
|
75
|
|
4
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Values exceeding level 3
|
Ä Other relevant test standards
ü BS 476: Fire tests on building materials and structures
ü BS 476-3: Fire tests on building materials and components - Fire tests on exposed roof parts
ü BS 476-4: Fire tests on building materials and structures - Tests on the non-combustibility of materials
ü BS 476-5: Test methods for ignition properties of building materials
ü BS 476-6: Fire tests on building materials and elements. Part 6: Test method for the spread of fire in products
ü BS 476-7: Fire tests on building materials and elements. Part 7: Test methods for determining the surface spread of flame of products
ü BS 476-11: Fire tests on building materials and elements. Part 11: Methods for determining the thermal radiation of building materials
ü BS 476-12: Fire tests on building materials and elements. Part 12: Test methods for the ignitability of products in direct contact with flames
ü BS 476-13: Fire tests on building materials and elements Part 13: Test methods for the flammability of radiant heat products
ü BS 476-15: Fire tests on building materials and structures - Test method for heat release rate of products
ü BS 476-20: Fire tests on building materials and elements. Part 20: Test methods for fire resistance of building elements (general principles)
ü BS 476-21: Fire tests on building materials and elements. Part 21: Test methods for fire resistance of load-bearing elements
ü BS 476-22: Methods of fire test for non-load bearing building elements
ü BS 476-23: Fire tests on building materials and components. Part 23: Test method for the contribution of components to the fire resistance of components
ü BS 476-24: Fire tests on building materials and elements. Part 24: Test methods for fire resistance of ventilation ducts
ü BS 476-31.1: Fire tests on building materials and components - Method for measuring the penetration of smoke through window and door assemblies. Method for measuring at room temperature
ü BS 476-33: Fire tests on building materials and structures - Physical indoor tests on surface products
