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Explosiveness

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

explosive properties of explosives

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because there are no chemical groups present in the molecule which are associated with explosive properties

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
According to REACh Annex VII / column 2, the study does not need to be conducted if there are no chemical groups associated with explosive properties present in the molecule.
According to Regulation (EC) N°1272/2008 (CLP) criteria and screening procedure (as listed in appendix 6 to the UN Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria (6th revised edition, 2015) or in the ECHA endpoint specific guidance on information requirements (R.7a, v6.0, July 2017, §R.7.1.11), NO REACTIVE GROUP was identified in the chemical structure.
Then explosive properties are not anticipated, and the acceptance procedure for Class 1 explosives shall not apply, no further testing is required.

Reference 2

Endpoint:

explosive properties of explosives

Type of information:

experimental study

Adequacy of study:

supporting study

Study period:

07-12 December 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study was conducted according to an internationally recognised method, and under GLP. The substance is adequately identified. Therefore full validation applies.

Qualifier:

according to guideline

Guideline:

EU Method A.14 (Explosive properties)

Deviations:

no

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Remarks:

11 April 2011

Specific details on test material used for the study:

- Appearance: White powder
- Storage conditions: The test item was stored in a closed vessel at room temperature away from light and humidity.

Key result

Parameter:

thermal sensitivity - Koenen test: limiting diameter (mm)

Remarks:

6 mm

Remarks on result:

not thermal sensitive if heated under defined confinement

Key result

Parameter:

thermal sensitivity - Koenen test: limiting diameter (mm)

Remarks:

2 mm

Remarks on result:

not thermal sensitive if heated under defined confinement

Key result

Parameter:

sensitiveness to impact: impact energy (J)

Remarks:

40 J

Remarks on result:

not sensitive to impact using an impact energy of 40 J

Key result

Parameter:

sensitiveness to friction: friction load (N)

Remarks:

360N

Remarks on result:

not sensitive to friction using a friction load of 360 N

Table 4.14/1: Observations

 

Method	Number of conducts	Loading	Number of positive reactions	Result
Thermal Sensitivity	3 with 2 mm 3 with 6 mm	Approx 19 g	0	not explosive
Mechanical Sensitivity (shock)	6 with 40 J	40 mm^3	0	not explosive
Mechanical Sensitivity (friction)	6 with 360 N	10 mm^3	0	not explosive

 

In the test for thermal sensitivity, the test item burned with a heavily sooting and sparking flame in the test using an orifice of 6 mm after 3 min. In the test with an orifice of 2 mm the test item began to burn after 2 min 30 s. Additionally, a flame fountain was observed.

The test for mechanical sensitivity (friction) yielded a weak greyish line on the porcelain peg in every experiment. According to the national reference institute (BAM, Bundesanstalt für Materialprüfung), this observation is no sign of explosive properties.

The test for mechanical sensitivity (shock) showed no reaction which gave a sign of explosive properties.

 

Discussion

No signs of an explosive reaction could be observed in any of the tests.

Therefore, the test item is considered as “not explosive under the conditions of guideline EU A.14”.

The guideline does not cover the explosive properties of dust consisting of test item (resp. mixtures of dust and air). Therefore, the result is stated as “under the conditions of guideline EU A.14”.

Interpretation of results:

study cannot be used for classification

Conclusions:

The substance is NOT classified as explosive according to Directive 67/548/EEC (DSD) criteria, i.e. under the conditions of guideline EU A.14.
The test is inconclusive according to Regulation (EC) N°1272/2008 (CLP) criteria.

Executive summary:

The explosive properties of test item were tested under GLP, according to EU A.14 guideline.

 

In the test for thermal sensitivity (Koenen tube), the item burned but no explosion was observed with an orifice of 6 or 2 mm.

In the test for mechanical sensitivity (shock), no explosion was observed using an impact energy of 40 J.

In the test for mechanical sensitivity (friction), no reaction was observed using a load of 360 N.

 

The test item can be considered as “not explosive under the conditions of guideline EU A.14”.

Description of key information

Testing not required, based on chemical structure.

Not explosive with regard to heat sensitivity (experimental).

Key value for chemical safety assessment

Explosiveness:

non explosive

Additional information

According to the screening procedure described in Regulation (EC) N°1272/2008 (CLP), the structure of the substance does not contain any chemical group associated with explosive properties.

Therefore, no further testing is required.

Moreover, a supporting experimental study for the determination of explosive properties, with regard to sensitivity towards heat, shock and friction is available. All tests were found negative, but the method (EU A14) was conducted according to previous Directive 67/548/EEC (DSD) classification criteria, so the conclusion cannot be extrapolated to CLP criteria, as the testing strategy and study design differ significantly. Nevertheless the Koenen tube test is common, and the negative result confirms that the substance is not sensitive to heat.

Justification for classification or non-classification

The substance is NOT classified as explosive according to CLP, based on the structural formula, that fulfills the screening procedure criteria.