Registration Dossier

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
explosiveness
Type of information:
other: expert statement
Adequacy of study:
key study
Study period:
June 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Expert statement
Justification for type of information:
None
Qualifier:
according to
Guideline:
other: As per the screening evaluation recommnded in CLP, UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria as well as REACH
Version / remarks:
The screening procedure as described in:
- CLP, Annex I, Part 2, paragraphs 2.1.4.2 and 2.1.4.3
- Appendix 6 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria
- Technical Guidance Document on the Information Requirements for REACH, Part 2 EWG 1-7, REACH Implementation Project (RIP) 3.3 Phase 2, chapter 7.1.11.3
Deviations:
not applicable
Principles of method if other than guideline:
Screening Evaluation
GLP compliance:
no
Specific details on test material used for the study:
None
Key result
Parameter:
other: More sensitive to shock than m-dinitrobenzene
Remarks on result:
other: not tested, expert statement
Key result
Parameter:
other: More sensitive to friction than m-dinitrobenzene
Remarks on result:
other: not tested, expert statement
Key result
Parameter:
other: Explosive under influence of flame
Remarks on result:
other: Not tested, expert statement
Key result
Parameter:
other: Explosive
Remarks on result:
other: Not tested, expert statement

Screening evaluation

No experimental test data according to EU Method A.14 or comparable methods for FAT 93589 are available. From literature Ammonium fluorosilicate is known to be noncombustible, but it will still release dangerous fumes in a fire, including hydrogen fluoride, silicon tetrafluoride, and nitrogen oxides1. When heating up, the substance is known to decompose starting at about 140-150 °C emitting very toxic fumes of hydrogen fluoride, ammonia, and nitroxides2,3,4. No information on explosive properties are available in literature.

Considering that explosive properties are associated with the presence of certain chemical groups in the molecule, a screening evaluation can be conducted aimed to identify the presence of such reactive groups within the molecular structure harvesting the capability for a rapid high energy release.

According to CLP Regulation examples of groups which may indicate explosive properties are:

-       C-C unsaturation (e.g. acetylenes, acetylides, 1,2-dienes);

-       C-Metal, N-Metal (e.g. Grignard reagents, organo-lithium compounds);

-       Contiguous nitrogen atoms (e.g. azides, aliphatic azo compounds, diazonium salts, hydrazines, sulphonylhydrazides);

-       Contiguous oxygen atoms (e.g. peroxides, ozonides);

-       N-O (e.g. hydroxyl amines, nitrates, nitro compounds, nitroso compounds, N-oxides, 1,2-oxazoles);

-       N-halogen (e.g. chloramines, fluoroamines);

-       O-halogen (e.g. chlorates, perchlorates, iodosyl compounds).

Analysis of the above depicted molecular structure revealed, that no such chemical alert structures are present in the molecule.

Calculation of the oxygen balance was calculated to -26.94.

Determination of the exothermic decomposition energy

In order to assess if the substance FAT 93589 possesses the potential to rapidly release huge amounts of energy normally a thermal analysis (Differential Scanning Calorimetry) is normally performed at the Analytical Department Huntsman Textile Effects (Germany) GmbH. In this case this analysis is not possible since the substance composes at about 140-150 °C to release SiF4, HF and NH3. Heating up to 350 °C will not result in the release of high energy peaks. The only energy released corresponds with substance decomposition energy. Due to safety reasons because of HF formed this analysis has not been performed and it is referred to literature data at this point.

As a result the energy release is expected to be below a critical trigger level of 500 J/g with the onset of energy release being below 500 °C.

In addition the dissociation reaction of(NH4)2SiF6in SiF4, 2NH3and 2HFis endotherm (based on the thermodynamic calculation of the enthalpy of formation of the educts (compare data provided inCRC Handbook of Chemistry and Physics, 97th Edition5).

DMfproducts - ∑DMfeducts = -12946.24 kJ/kg – (-15051.39 kJ/kg) = -2105.15 kJ/kg (or -2681 kJ/mol).

Interpretation of results:
GHS criteria not met
Conclusions:
The substance is considered to be non-explosive.
Executive summary:

In summary, analysis of the chemical structure reveals no alerts for explosive properties. Also data available in various databases do not contain any information about explosive properties of the substance. The calculation of a chemical oxygen balance gave a value of -26.94. The substance has been demonstrate to decompose starting at about 100-140 °C with no release of explosive of combustible gases and theenergy release is expected to be below a critical trigger level of 500 J/g with the onset of energy release being below 500 °C since the enthalpy of formation is demonstrating the decomposition reaction to be endothermic. Therefore the substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008 and no further testing is required.

Description of key information

Analysis of the chemical structure reveals no alerts for explosive properties. Also data available in various databases do not contain any information about explosive properties of the substance. The calculation of a chemical oxygen balance gave a value of -26.94. The substance has been demonstrate to decompose starting at about 100-140 °C with no release of explosive of combustible gases and theenergy release is expected to be below a critical trigger level of 500 J/g with the onset of energy release being below 500 °C since the enthalpy of formation is demonstrating the decomposition reaction to be endothermic. Therefore the substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008 and no further testing is required.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

Justification for classification or non-classification

The substance is considered to be non-explosive according to Directive 67/548/EEC and Regulation (EC) 1272/2008 and no further testing is required.