Tetrasodium 4-amino-5-hydroxy-6-[[2-methoxy-5-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]azo]-3-[[4-[[2-(sulphonatooxy)ethyl]sulphonyl]phenyl]azo]naphthalene-2,7-disulphonate

Explosiveness

Link to relevant study record(s)

Reference

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

key study

Study period:

February 27, 2015 - March 25, 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.14 (Explosive properties)

Deviations:

no

GLP compliance:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Parameter:

sensitiveness to impact: impact energy (J)

Remarks on result:

not sensitive to impact using an impact energy of 40 J

Remarks:

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion within 6 tests using a mass of 10 kg falling from a height of 0.4 m was observed.

Parameter:

sensitiveness to friction: friction load (N)

Remarks on result:

not sensitive to friction using a friction load of 360 N

Remarks:

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion occurred within 6 tests using a pinload of 360 N.

Parameter:

thermal sensitivity - Koenen test: limiting diameter (mm)

Remarks:

migrated information

Remarks on result:

not thermal sensitive if heated under defined confinement

Remarks:

Three tests were performed with a circular nozzle plate with a hole of 2 mm diameter. No explosion was observed.

 

Thermal stability

Two DSC-measurements in closed glass crucibles (in high pressure crucibles) with the test item showed a broad exothermal effect in the temperature range of 160 – 370 °C with an overall enthalpy of -760 J/g and -741 J/g. The measurement was terminated at 500 °C. The unsteady base line at higher measuring temperatures is supposed to result from a pressure build-up of the test item.

The results are summarised in Table 1.

 

Table 1: Thermal stability (DSC-measurements)

Ident-No.	Weight [mg]	Final temperature [°C]	Temperature range [°C]	Type of effect	Enthalpy [J/g]
34860	10.91	500	160 – 370	Exothermal	-760
34862	11.52	500	160 – 370	Exothermal	-741

 

Explosive properties

The median decomposition enthalpy was - 750 J/g. Therefore, the main test on explosive properties had to be performed.

Mechanical sensitivity (friction):

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion occurred within 6 tests using a pinload of 360 N.

Mechanical sensitivity (shock):

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion within 6 tests using a mass of 10 kg falling from a height of 0.4 m was observed.

Thermal sensitivity:

Three tests were performed with a circular nozzle plate with a hole of 2 mm diameter. No explosion was observed.Table 2 gives the results of the thermal sensitivity.

 

Table 2: Thermal sensitivity

Test no.	Weight of test item [g]	Nozzle width [mm]	t1 [s]	t2 [s]	Reaction	Appearance; Number of fragments
1	18.0	2.0	24	> 300	Flame	O
2	18.0	2.0	27	> 300	Flame	O
3	17.9	2.0	21	> 300	Flame	O

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

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

O: tube unchanged

 

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 item 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 was excluded.

Interpretation of results:

GHS criteria not met

Conclusions:

The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.

Executive summary:

Thermal stability

Two DSC-measurements in closed glass crucibles (in high pressure crucibles) with the test item showed a broad exothermal effect in the temperature range of 160 – 370 °C with an overall enthalpy of -760 J/g and -741 J/g. The measurement was terminated at 500 °C. The unsteady base line at higher measuring temperatures is supposed to result from a pressure build-up of the test item.

The results are summarised in Table 1.

 

Table 1: Thermal stability (DSC-measurements)

Ident-No.	Weight [mg]	Final temperature [°C]	Temperature range [°C]	Type of effect	Enthalpy [J/g]
34860	10.91	500	160 – 370	Exothermal	-760
34862	11.52	500	160 – 370	Exothermal	-741

 

Explosive properties

The median decomposition enthalpy was - 750 J/g. Therefore, the main test on explosive properties had to be performed.

Mechanical sensitivity (friction):

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion occurred within 6 tests using a pinload of 360 N.

Mechanical sensitivity (shock):

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion within 6 tests using a mass of 10 kg falling from a height of 0.4 m was observed.

Thermal sensitivity:

Three tests were performed with a circular nozzle plate with a hole of 2 mm diameter. No explosion was observed.Table 2 gives the results of the thermal sensitivity.

 

Table 2: Thermal sensitivity

Test no.	Weight of test item [g]	Nozzle width [mm]	t1 [s]	t2 [s]	Reaction	Appearance; Number of fragments
1	18.0	2.0	24	> 300	Flame	O
2	18.0	2.0	27	> 300	Flame	O
3	17.9	2.0	21	> 300	Flame	O

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

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

O: tube unchanged

 

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 item 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 was excluded.

The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.

Description of key information

The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

Two DSC-measurements in closed glass crucibles (in high pressure crucibles) with the test item showed a broad exothermal effect in the temperature range of 160 – 370 °C with an overall enthalpy of -760 J/g and -741 J/g. The measurement was terminated at 500 °C. The unsteady base line at higher measuring temperatures is supposed to result from a pressure build-up of the test item.

Thermal stability (DSC-measurements)

Ident-No.		Weight [mg]		Final temperature [°C]		Temperature range [°C]		Type of effect		Enthalpy [J/g]
34860		10.91		500		160 – 370		Exothermal		-760
34862		11.52		500		160 – 370		Exothermal		-741

Explosive properties

The median decomposition enthalpy was - 750 J/g. Therefore, the main test on explosive properties had to be performed.

Mechanical sensitivity (friction):

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion occurred within 6 tests using a pinload of 360 N.

Mechanical sensitivity (shock):

The test item was sieved (mesh size 0.5 mm) before the measurement. No explosion within 6 tests using a mass of 10 kg falling from a height of 0.4 m was observed.

Thermal sensitivity:

Three tests were performed with a circular nozzle plate with a hole of 2 mm diameter. No explosion was observed.Table 42gives the results of the thermal sensitivity.

Thermal sensitivity

Test no.		Weight of test item [g]		Nozzle width [mm]		t1[s]		t2[s]		Reaction		Appearance; Number of fragments
1		18.0		2.0		24		> 300		Flame		O
2		18.0		2.0		27		> 300		Flame		O
3		17.9		2.0		21		> 300		Flame		O

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

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

O: tube unchanged

 

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 item 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 was excluded.

The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.

Justification for classification or non-classification

The test item had no explosive properties in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.14.