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Home   Test method   BS 476-7:1997 Classification of spread of flame
 

BS 476-7:1997 Classification of spread of flame

BS 476-7:1997 Classification of spread of flame

BS 476-7 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

Classification of spread of flame

Classification

Spread of flame at 1.5 min

Final spread of flame (10 min)

Limit  (mm)

Limit for one specimen in sample   (mm)

Limit  (mm)

Limit for one specimen in sample  (mm)

Class 1

165

165+25

165

165+25

Class 2

215

215+25

455

455+45

Class 3

265

265+25

710

710+75

Class 4

Exceeding the limits for class 3

 

BS 476 reference standard

BS 476 Fire tests on building materials and structures.

BS 476-3:2004 external fire exposure roof test

BS 476-4:1970 Non-combustibility test for materials

BS 476-5:1979 Method of test of ignitability

BS476-6:1989 Method of test for propagation for materials

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

BS 476-11:1982 Method for assessing the heat emission from building materials

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)

BS 476-21:1987 Methods for determination of the fire resistance of loadbearing elements of construction

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

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 Source:防火网  Addtime:2010-7-29  Hits:7048

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