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Diss Factsheets

Physical & Chemical properties

Explosiveness

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Reference
Endpoint:
explosiveness
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Justification for type of information:
Target and source substances are highly similar, both structurally and chemically.
Reason / purpose for cross-reference:
read-across source
Qualifier:
according to guideline
Guideline:
EU Method A.14 (Explosive properties)
Deviations:
no
GLP compliance:
no
Parameter:
other: More sensitive to shock than m-dinitrobenzene
Remarks:
migrated information
Remarks on result:
not measured/tested
Parameter:
other: More sensitive to friction than m-dinitrobenzene
Remarks:
migrated information
Remarks on result:
not measured/tested
Parameter:
other: Explosive under influence of flame
Remarks:
migrated information
Remarks on result:
negative (not further specified)
Parameter:
other: Explosive (not specified)
Remarks:
migrated information
Remarks on result:
negative (not further specified)

The DSC-measurement is a closed glass crucible with the test item showed an exothermal effect in the temperature range 120 – 195 °C with an energy of 504 J/g.

 

Due to the decomposition energy which was found in the DSC measurements in closed crucibles of > 500 J/g, the main test on explosion properties was performed:

a)      Mechanical sensitivity (shock): no explosion within 6 tests using a mass of 10 kg falling from a height 0.4 m was observed.

b)      Thermal sensitivity: the test on thermal sensitivity carried out with a nozzle with a diameter of 2.0 mm showed no explosion. Compared to the nozzle with a diameter of 6.0 mm the venting area of the nozzle with 2.0 mm is smaller by an order of magnitude. Additionally the physical state of the test substance excludes the enrichment of high-energy components caused by evaporation of volatile solvents. Due to these facts an explosion with a nozzle width of 6.0 mm is excluded.

c)      Mechanical sensitivity (friction): as a test of mechanical sensitivity with respect to friction is not required for liquids, the mechanical friction test was not performed.

Table 1: thermal sensitivity

Test No.

Weight of test item (g)

Nozzle width (mm)

t1 (s)

t2 (s)

Reaction

Appearance, number of fragments

1

40.0

2.0

25

> 300

Flame

none

2

39.5

2.0

25

> 300

Flame

none

3

40.0

2.0

25

> 300

Flame

none

t1: time to any reaction, e.g. whistle or flame

t2: time to main reaction, e.g. rupture of tube or flashing

Interpretation of results:
non explosive
Conclusions:
The test item Urea sulphate LOWER-7 has no explosive properties according to EU criteria.
Executive summary:

The explosive properties of Uronium hydrogen Sulphate were tested according to EU guideline A.14.

according to the test results, Uronium hydrogen sulphate has no explosive properties according to EU criteria.

Description of key information

Uronium hydrogen sulphate has no explosive properties according to EU criteria.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification

Data are conclusive for explosiveness, but not sufficient for classification according to CLP criteria (Regulation (EC) No 1272/2008).

No classification is proposed for explosiveness according to CLP.