GB/T 21622-2008 English PDF (GBT21622-2008)

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GB/T 21622-2008: Dangerous goods -- Test method for corrosion to metals
GB/T 21622-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.300
A 80
Dangerous goods - Sustained combustibility test for
flammable liquids
ISSUED ON: APRIL 01, 2008
IMPLEMENTED ON: SEPTEMBER 01, 2008
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Method principle ... 4
3 Equipment ... 4
4 Operating procedure ... 5
5 Evaluation of results ... 5
Appendix A (Informative) Sustained combustibility test device ... 6
Dangerous goods - Sustained combustibility test for
flammable liquids
1 Scope
This Standard specifies the equipment, operating procedure and evaluation of results of
the sustained combustibility test for dangerous flammable liquids.
This Standard applies to dangerous liquids whose flash point is not higher than 60.5 °C
in the closed cup test or not higher than 65.5 °C in the open cup test. This Standard also
applies to liquids submitted for transport in the condition where the temperature is equal
to or higher than their flash point AND substances – transported or submitted for
transport in a liquid state – which emit flammable vapors at a temperature equal to or
lower than the maximum transport temperature.
2 Method principle
2.1 Heat the sample tank to the specified temperature; put a specified amount of test
substance into the sample tank; apply a standard flame under the specified conditions;
then, remove it; observe whether there is sustained combustibility for the test substance.
2.2 Sustained combustibility: If any of the following conditions occurs in any one of
the two heating times or at one of the two heating temperatures, it shall be considered
as sustained combustibility:
a) When the test flame is in the “off” position, the sample is ignited and continues to
burn;
b) When the test flame stays in the test position for 15 s, the sample is ignited and
continues to burn for more than 15 s after the test flame returns to the “off”
position. Intermittent sparking shall not be interpreted as sustained combustibility.
Usually by the time 15 s is up, combustion has either visibly ceased or sustains.
If in doubt, the substance shall be regarded as sustained combustibility.
3 Equipment
a) Sustained combustibility test device (see Appendix A).
b) Syringe, 5 mL, minimum scale 0.1 mL.
c) Stopwatch, accuracy 0.5 s.
4 Operating procedure
4.1 Turn on the heating device of the sustained combustibility tester, heat the sample
tank to the test temperature (60.5 °C ± 1 °C or 75 °C ± 1 °C); keep the test temperature
constant for 5 minutes. If the atmospheric pressure during the test is different from the
standard atmospheric pressure, the test temperature shall be adjusted as follows: every
time the pressure is 4 KPa higher or lower, the test temperature shall be raised or
lowered by 1.0 °C.
4.2 When the gas nozzle leaves the test position (that is, it is in the “off” position), ignite
the butane. Adjust the size of the flame so that its length is 8 mm ~ 9 mm and its width
is about 5 mm.
4.3 Stir the sample to make it evenly mixed. Use a syringe to draw 2 mL ± 0.1 mL of
sample; quickly move the sample into the sample tank; immediately start the timing
device.
4.4 After the heating time reaches 60 s, if the sample does not ignite, turn the butane
flame to the test position, and keep the flame at this position for 15 s; remove it (that is,
turn to the “off” position); observe the sample state. The test flame shall remain lit
throughout the process.
4.5 The test shall be carried out three times, each of which shall be observed and
recorded:
4.5.1 Before the butane flame is moved to the test position, whether the sample ignites
and sustains burning, or sparks, or neither;
4.5.2 Whether the sample ignites while the butane flame is in the test position, and if
so, how long does the burning last after the test flame is removed.
4.6 If sustained combustibility is not observed, use a new sample to repeat the procedure,
but change the heating time to 30 s.
4.7 If sustained combustibility is not observed at the test temperature of 60.5 °C, repeat
the entire procedure with a new sample at the test temperature of 75 °C.
5 Evaluation of results
Depending on the observed phenomena and the associated definitions, classify the
substance as either non-sustained combustibility or sustained combustibility.