BS 476-7:1997 Classification of spread of flame

BS 476-7:1997 Classification of spread of flame

Fire tests on building materials and structures-Part 7 method of test to determine the classification of the surface spread of flame of products.

The specimen is mounted in a water-cooled holder and is exposed to a radiant panel over a ten minute test duration. In addition, a pilot flame is applied to the bottom corner of the specimen during the first minute of test. The time required for the flame front to reach reference marks on the specimen is noted, together with the extent of flame spread at one minute thirty seconds test duration and at the end of the test. Observations are also made of the burning behaviour.

Materials are classified according to test performance as shown in the table below. Class 1 is the best classification that can be achieved during this test alone and Class 4 is the worst classification that can be achieved on this test. Class 4 materials are considered high risk.

Evaluate BS 476-7 classification of spread of flame

BS 476 reference standard

BS 476 Fire tests on building materials and structures.

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BS 476-7:1997 Surface spread of flame test for material

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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)

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BS 476-22:1987 Methods for determination of the fire resistance of non-loadbearing elements of construction

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