BS 05852:2006 pdf download
BS 05852:2006 pdf download.Methods of test forassessment of theignitability of
upholstered seating bysmouldering and flamingignition sources.
4.Z.1 upnoistery composites
For the purposes of testing the ignitability of upholstery composites (see Clause 11), all the following types of behaviour shall be deemed to be flaming ignition:
a) any test specimen that displays escalating flaming combustion behaviour so that it is unsafe to continue the test and forcible extinction 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 part of the test specimen, or passes through the full thickness of the specimen within the duration of the test (but see Note 1);
NOTE I It is recommended tha.t composites which fail criterion c), e.g. because the full thickness is penetrated. by molten material rather than by flames, are tested as a complete item offurniture (see Clause 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 burner tube 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 mill after ignition of the crib;
0 for flaming ignition sources 6 and 7: any test specimen that continues to flame for more than 13 mm after ignition of the crib; NOTE 2 The times cjuoted in items e) an.dJ) are essentially 2 mi’n greater than the upper 95% probable extinction times of wooden cribs determined by interlaboratory testing.
g) for all sources: any test specimen from which flaming debris causes an isolated floor fire that continues to flame for longer than the time given in d), e) or .
4.2.2 Complete items of furniture
For the purposes of testing the ignitability of complete items of furniture (see Clause 12), all the following types of behaviour shall be deemed to be progressive smouldering ignition:
a) those given in 4.2.1 items a), b), d), e), f) and g), but including source 1 for item 4.2.ld);
b) any test specimen on which any flame front reaches the extremities of the specimen other than the top of the vertical part of the test specimen, within the duration of the test;
c) for source 0 (cigarette): the occurrence of any visible flaming within 60 mm of placement of the cigarette.
5 Principle
A test specimen is subjected to a series of ignition sources.
NOTE The series is designed to represent a range qf actual intensities that. iniqht be accidentally encountered in various end—use envzronments.
In Clause 11 the test rig stylizes the critical geometry of vertical/horizontal junctions typically found in furniture, but tests a single cover/filling combination. In Clause 12 the test specimen consists of a complete item of furniture.
6 Health and safety of operators
WARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage.
NOTE 1 Suitable precautions might include the provision qf breathing apparatus and protective clothing.
NOTE 2 Attention is drawn to the Health.. and Sqfètj at Work etc. Act 1974 /5] in respect ofsafety precautions.
6.1 Test enclosure
The tests shall be conducted in a suitable fume cupboard or purpose-built room so that individuals are not exposed to fumes (see 7.4).
6.2 Extinguishers
Readily accessible means of extinguishing the test specimens shall beprovided.For the purposes of testing the ignitability of complete itemsof furniture (Clause 12), the extinguishing system shall be of sufficientcapacity to deal with a fully developed fire.
