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This British Standard, a part of the BS 476 series, specifies a method of test, the result being expressed as a fire propagation index, that provides a comparative measure of the contribution to the growth of fire made by an essentially flat material, composite or assembly.

This edition of the standard was prepared in order to specify a replacement calibration sheet because of problems of availability of the sheet specified in the previous edition. Experience with a wide range of materials has indicated that the non-combustible material now specified should not produce test results which are more onerous.

In this method of test a specimenof the product (material, composite or assembly) is subjected to a specific heating regime. The test takes account of the combined effect of factors such as the ignition characteristics, the amount and the rate of heat release, and the thermal properties of the product in relation to their ability to accelerate the rate of fire growth.

This British Standard is primarily intended for the assessment of the performance of internal wall and ceiling linings.

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