BS 5852:2006 pdf download

4.2 Flaming ignition
4.2.1 Upholstery composites

For the purposes of testing the ignitability of upholstery composites(see Clause 11), all the following types of behaviour shall be deemed tobe flaming ignition:

a) any test specimen that displays escalating flaming combustion

behaviour so that it is unsafe to continue the test and forcibleextinction is required;

b) any test specimen that burns until it is essentially consumed within

the test duration;

c) any test specimen on which any flame front reaches the

extremities of the specimen other than the top of the vertical partof the test specimen, or passes through the full thickness of thespecimen within the duration of the test (but see Note 1);

NOTE 1 lt is recomnended that composites wlich fail criterion c),e.g. because the full thickness is penetrated by mmolten material ratherthan by flames, are tested as a complete item of furniture (see Ciause 12).

d) for flaming ignition sources 2 and 3: any test specimen that

continues to flame for more than 120 s after removal of the burnertube or in which the flame front spreads past a vertical line

100 mm from the tip of the burner tube;

e) for flaming ignition sources 4 and 5: any test specimen that

continues to flame for more than 10 min after ignition of the crib;
f) for flaming ignition sources 6 and 7: any test specimen that

continues to flame for more than 13 min after ignition of the crib;NOTE 2The times quoted in items e) and f) are essentially 2 mingreater than the upper 95% probable extinction times of wooden cribsdetermined bgy interlaboratory testing.

g) for all sources: any test specimen from which flaming debris causes an isolated floor fire that continues to flame for longer thanthe time given in d), e) or f).