Hydroxylammonium chloride

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:

04 Mar - 12 Apr 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.14 (Explosive properties)

Qualifier:

according to guideline

Guideline:

other: OECD 113 Screening test for thermal stability and stability in air

GLP compliance:

no

Specific details on test material used for the study:

Storage conditions: ambient temperature (10 – 30 °C), dry

Parameter:

other: Thermal stability (DSC)

Remarks on result:

other: Maximum energy release was 2313 J/g and test item is inorganic, therefore main test on explosive properties was carried out.

Parameter:

sensitiveness to friction: friction load (N)

Remarks on result:

not sensitive to friction using a friction load of 360 N

Parameter:

other: mechanical sensitivity (shock)

Remarks on result:

other: not sensitive to shock using a mass of 10 Kg falling from 0.4 m

Parameter:

thermal sensitivity - Koenen test: diameter of the orifice plate

Remarks:

6 mm diameter nozzle

Remarks on result:

not thermal sensitive if heated under defined confinement

Remarks:

tube unchanged

Parameter:

thermal sensitivity - Koenen test: diameter of the orifice plate

Remarks:

2 mm diameter nozzle

Remarks on result:

other: bottom of tube bulged out

Results
Thermal Stability
Two DSC measurements in closed high pressure glass crucibles with the test item showed an endothermal effect starting at 130 °C, directly followed by an exothermal effect in the temperature range of 160 to 240 °C with a maximum energy release of 2313 J/g.

Table 1 – Thermal Stability (DSC measurements)

Weight [mg]	Final temperature [°C]	Temperature range [°C]	Type of effect	Energy [J/g]
9.41	500	130 – 160 160 – 240	endothermal exothermal	n.r. 2313
9.85		150 – 170 170 – 235	endothermal exothermal	n.r. 1933

n.r.: not relevant

Explosive Properties
The test item is mainly inorganic compounds, therefore the main test on explosive properties had to be performed.

Mechanical Stability (friction): Test item was sieved before measurement. No explosion occurred within 6 tests using a pinload of 360 N, only a discoloration of the test item was seen in 3 tests.

Mechanical Sensitivity (schock): Test item was sieved before measurement, no explosion within 6 tests using a mass of 10 Kg falling from a height of 0.4 m was seen.

Thermal Sensitivity: 3 tests were done with a circular nozzle plate with a hole of 2 mm diameter and 3 were 3 were done with one of 6 mm diameter. No explosion was seen.

 

Table 2 – Thermal sensitivity results

Test no.	Test item weight [g]	Nozzle width [mm]	t1[s]	t2[s]	Reaction	Appearance; number of fragments
1	26.1	2.0	26	>300	flame	A
2			27
3			26
4		6.0	17			O
5			16
6			16

t₁: time to any reaction, e.g. whistle or flame
t₂: time to main reaction, e.g. rupture of tube or flashing
A: bottom of tube bulged out
O: tube unchanged

Conclusion: The test item had no explosive properties.

Description of key information

Not explosive (EU Method A.14., Thermal Stability)

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

Substance was previously classified as Explosive R2 according to 67/548/EEC or 1999/45/EC.

According to Regulation (EC) 1272/2008 the substance is not classified as explosive.

Justification for classification or non-classification

The available data on explosive properties of the test substance do not meet the criteria for classification according to Regulation (EC) 1272/2008, and are therefore conclusive but not sufficient for classification: Main test on explosive properties showed no explosion.