The following equipment and material are necessary for the
test:
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.1 The test rig for support of the specimen is
shown in Figure 1. The stand
is made of angle iron with nominal dimensions 25 mm x 25 mm x 3 mm.
On top of the stand is a platform of wire mesh with openings of nominal
dimensions 100 mm x 50 mm.
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.2 Mineral wool with a nominal density of 60 kg/m3 and with dimensions 450 mm x 350 mm x 50 mm.
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.3 Stop clock.
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.4 Test enclosure, being either a room with a
volume greater than 20 m3 (which contains adequate oxygen
for testing), or a smaller enclosure with a through flow of air. Inlet
and extraction systems providing air speed of 0.02 m/s to 0.2 m/s
in the locality of the rig provide adequate oxygen without disturbing
the burning behaviour.
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.5 Ignition sources. The sequent ignition sources
used are a smouldering cigarette covered with a cotton wool pad and
an open flame.
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.6 Cigarettes. For the tests, cigarettes with
the following specifications should be used:
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Length:
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70 ± 4 mm
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Diameter:
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8 ± 0.5 mm
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Weight:
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1 ± 0.1 g
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Smouldering rate:
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12 ± 3 min/50
mm
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Figure 1 Test Rig
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The smouldering rate shall be verified for every carton
of 200 cigarettes as follows:
The cigarettes are conditioned as described below under 5.4.
One cigarette is marked at distances 5 mm and 55 mm from one end.
The cigarette is ignited at the end with the 5 mm distance marking,
and the air is drawn through the cigarette until a clear glow is observed,
but not further than on to the 5 mm marking, whereafter the cigarette
is impaled horizontally on a wire spike inserted not more than 13
mm into the unlit end. The time is recorded for the smouldering from
the 5 mm to the 55 mm marks.
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.7 Cotton wool pad. The cigarette should be covered
with a pad of cotton wool of nominal dimensions 150 mm x 150 mm x
25 mm and of weight 20 ± 6.5 g. The cotton wool should consist
of new, undyed and soft fibres without any admixtures or artificial
fibres, and it should be free from thread, leaf and shell fibre dusts.
A suitable material for this purpose is packaged in the form of rolls
for surgical use. The piece should be unwrapped from the roll as a
single layer 25 mm to 30 mm thick, cut to plan size, then reduced
to the correct mass and thickness by removal of loose fibres from
the top.
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.8 Flame. The burner is a tube of stainless steel
with internal diameter 6.5 ± 0.1 mm, outside diameter 8 ±
0.1 mm and length 200 mm. The fuel may be butane or propane gas. Fuel
supply rate: 6.38 ± O.25 g/h at 20°C.