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BS 476-7: Surface Flammability test to Building Material

Zoom  Zoom Issue Date:2011-07-15   Source:Firetc   Browse:14225
BS 476 part 7 specifies a method of test for measuring the lateral spread of flame along the surface of a specimen of a product orientated in the vertical position under opposed flow conditions, and a classification system based on the rate and extent of

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BS 476-7 surface flammability test to Building Material – Standard
> BS 476-7: Fire Tests on Building materials and structures – Method of test to determine the classification of the surface spread of flame of products

BS 476-7 surface flammability test to Building Material – Brief
This Part of BS 476 specifies a method of test for measuring the lateral spread of flame along the surface of a specimen of a product orientated in the vertical position under opposed flow conditions, and a classification system based on the rate and extent of the spread of flame. It provides data suitable for comparing the end-use performances of essentially flat materials, composites or assemblies, which are used primarily as the exposed surfaces of walls or ceilings.

BS 476-7 surface flammability test to Building Material – Test Procedure

BS 476-7

Ignite the pilot flame.
Remove a specimen construction, including any backing boards, spacers and filler pieces, from the conditioning atmosphere, and within 5 min insert it into the specimen holder in its standby position at 90Ê or more from the test position.
Within 5 s swing the specimen holder and specimen into the test position, and immediately start the timing mechanism, i.e. start the test.
Extinguish the pilot flame 1 min after the start of the test.
Terminate the test when the flame front reaches the 825 mm reference line, or after 10 min has elapsed, whichever is the shorter.
Swing the specimen holder into its standby position and remove the remains of the specimen construction. Clean any debris from the holder.
Repeat the procedures given in a) to f) above for each of the remaining specimen constructions.
Classification
Spread of flame at 1.5 min
Final Spread of flame
Limited
(mm)
Limit for one specimen in sample (mm)
Limit
(mm)
Limit for one specimen in sample (mm)
1
165
25
165
25
2
215
25
455
45
3
265
25
710
75
4
Exceeding the limits for class 3

BS 476-7 surface flammability test to Building Material – Reference Standard
> BS 476Fire tests on building materials and structures
> BS 476-3Fire tests on building materials and structures. Classification and method of test for external fire exposure to roofs
> BS 476-4Fire tests on building materials and structures - Part 4: Non-combustibility test for materials
> BS 476-5Fire Tests on Building Materials and Structures Part 5: Method of Test for Ignitability
> BS 476-6Fire tests on building materials and structures - Part 6: Method of test for fire propagation for products
> BS 476-7Fire Tests on Building Materials and Structures - Part 7: Method of Test to Determine the Classification of the Surface Spread of Flame of Products
> BS 476-11Fire tests on building materials and structures - Part 11: Method for assessing the heat emission from building materials
> BS 476-12Fire tests on building materials and structures - Part 12: Method of test for ignitability of products by direct flame impingement
> BS 476-13Fire Tests on Building Materials and Structures - Part 13: Method of Measuring the Ignitability of Products Subjected to Thermal Irradiance
> BS 476-15Fire Tests on Building Materials and Structures - Part 15: Method of Measuring the Rate of Heat Release of Products
> BS 476-20Fire Tests on Building Materials and Structures - Part 20: Method for Determination of the Fire Resistance of Elements of Construction (General Principles)
> BS 476-21Fire Tests on Building Materials and Structures - Part 21: Methods for Determination of the Fire Resistance of Load bearing Elements of Construction
> BS 476-22Fire Tests on Building Materials and Structures - Part 22: Methods for Determination of the Fire Resistance of Non- Load bearing Elements of Construction
> BS 476-23Fire Tests on Building Materials and Structures - Part 23: Methods for Determination of the Contribution of Components to the Fire Resistance of a Structure
> BS 476-24Fire Tests on Building Materials and Structures - Part 24: Method for Determination of the Fire Resistance of Ventilation Ducts

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