Registration Dossier

Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
other: Dust flammability, explosibility and thermal instability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
May 1995
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1995

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
other: ISO 6184/1 (1985) -- Determination of Explosion Indices of Combustible Dusts in Air.
Qualifier:
equivalent or similar to guideline
Guideline:
other: BS 6713: Part 1: 1986 Explosion Protection systems.
Qualifier:
equivalent or similar to guideline
Guideline:
other: ASTM Standard E1226-88.
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
5,5'-dithiodi-1,3,4-thiadiazole-2(3H)-thione
EC Number:
276-763-0
EC Name:
5,5'-dithiodi-1,3,4-thiadiazole-2(3H)-thione
Cas Number:
72676-55-2
Molecular formula:
C4-H2-N4-S6
IUPAC Name:
5-[(5-sulfanylidene-4,5-dihydro-1,3,4-thiadiazol-2-yl)disulfanyl]-2,3-dihydro-1,3,4-thiadiazole-2-thione
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder

Results and discussion

Results:
Max explosion pressure (bar): 9.4

Max rate of pressure rise (bar/s): 1183

Kst value (bar.m/s): 321

Any other information on results incl. tables

During testing of powders in the 201 sphere test to BS6713 and ISO6184/1 1985 approximately seven different concentrations are tested. The mean values are given for each of the concentrations tested. The final quoted valued for pressure, rate of pressure rise and concentration are calculated from the mean of the maximum values during test series 1, 2, &3 in accordance with the 201 sphere test protocol.

Maximum values are not quoted. The average result over the three series is given. This is because slight variations in turbulence or chemical ignitor energy may marginally effect the results.

The standard test does not provide the maximum rate of pressure rise; a decrease in ignition delay will give higher maximum rate of pressure rise data. The turbulence level is selected to correlate with data from l arge (industrial scale) vessels. The cube root Law on which the 201 sphere test is based, assumes that on plant scale, the dust suspension is quiescent (i.e., negligible turbulence).

Applicant's summary and conclusion

Conclusions:
The Kst (bar.m/s) value is 321.
Executive summary:

The Kst (bar.m/s) value is 321. According to the relationship between the Kst value and the physical severity of dust explosion a value greater than 300 indicates very strong explosion.