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Diss Factsheets

Administrative data

Endpoint:
explosiveness, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
01/02/2011 Operator : P. Bremble
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
The test was performed using a 20 litre sphere apparatus and KSEP software manufactured by Adolf Kuhner AG. The test is based on EN 14034 – Parts 1&2.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report date:
2011

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
20 Litre Sphere - (Explosion Severity): Explosion severity is a measure of the maximum pressure (Pmax) and the rate of pressure increase (dP/dtmax) generated by an exploding dust cloud determined in what is known as the ‘20 litre sphere’ apparatus. Additional information obtained from the studies include the Kst value and St class which may be used to ‘group’ powders as to their explosion severity.
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
2,2-dimethylpropanethioamide
EC Number:
677-829-5
Cas Number:
630-22-8
Molecular formula:
C5H11NS
IUPAC Name:
2,2-dimethylpropanethioamide
Test material form:
solid: crystalline
Details on test material:
Purity or Composition 100.0 %

Results and discussion

Small-scale preliminary tests
Key result
Parameter:
other: 20L Sphere System 2
Value:
2

Applicant's summary and conclusion

Interpretation of results:
other:
Conclusions:
 Dust cloud ignition produces a strong dust explosion (St 2; Kst = 248 bar.m/s).
 Dust cloud explosions will produce high maximum pressure (Pmax = 8.3 bar).
 Dust clouds are very sensitive to ignition from electrostatic discharges (15 - 17 mJ).
 Dust clouds are of low sensitivity to ignition from hot surfaces (340°C).
 No ignition or exotherm of powder layers observed up to 400°C.