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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Reference:
Composition 0
Qualifier:
according to
Guideline:
UN Manual of Tests and Criteria: Part I: Classification procedures, test methods and criteria relating to explosives of Class 1
Deviations:
no
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Test material information:
Composition 1
Specific details on test material used for the study:
- Purity not specified
- Batch number: BXR5U4G
Key result
Parameter:
other: decomposition energy
Value:
920
Remarks on result:
thermal sensitive if heated under defined confinement
Remarks:
At a heating rate of 3 K/min, an exothermic reaction started at 183 °C with a heat release of about 920 kJ/kg
Key result
Test series:
UN Test series 1
Method:
other: Trautzl lead block test
Parameter:
other: explosive power
Remarks:
volume of the cavity in the lead block per 10 g of test item
Value:
0
Result:
positive, explosion
Remarks:
Under high confinement an explosive power is possible
Remarks on result:
other: The expansion of the lead block in one of two determinations was less than 25 ml but more than or equal to 10 ml per 10 g of sample
Remarks:
12.3 mL/9.9 g sample mass, 3.6 mL/10.4 g sample mass
Key result
Test series:
UN Test series 1
Method:
UN Test 2 (a): UN gap test
Parameter:
other: Sensitivity to shock
Value:
0
Result:
negative, not sensitive to detonative shock
Remarks:
witness plate and tube not damaged
Key result
Test series:
UN Test series 1
Method:
UN Test 1 (b): Koenen test
Parameter:
other: Orifice Diameter
Remarks:
1 mm
Value:
0
Result:
negative, no violent effect on heating under confinement
Remarks:
Time to beginning of reaction/burning: 49, 55 and 58 s
Key result
Test series:
UN Test series 1
Method:
UN Test 1 (c) (i): Time/pressure test
Parameter:
other: Maximum pressure
Remarks:
Time for Pressure Rise from 690 kPa to 2.070 kPa
Value:
0
Result:
negative, no ability to deflagrate
Remarks:
Maximum pressures: 594, 625 and 720 kPa
Remarks on result:
p < 2070 kPa

The result of investigations of explosive properties: The substance is not class 1.

Interpretation of results:
GHS criteria not met
Conclusions:
Imidoxim was not sensitive to detonative shock, did not show effects on heating under confinement and was also unable to deflagrate according to the acceptance procedure for "Class 1 explosives". Therefore Imidoxim has to be classified as not explosive.
Executive summary:

The Differential Thermal Analysis (DTA) measurement was carried out as stipulated in UN-MTC (Part III, sub-section 20.3.3.3 Thermal stability and exothermic decomposition energy). At a heating rate of 3 K/min, an exothermic reaction started at 183 °C with a heat release of about 920 kJ/kg. Based on this thermal behavior it was expected that the substance could be explosive. Because the oxygen balance was -195.5, testing according to UN-MTC test procedure was necessary. Investigations of explosive properties were performed according the UN-Standard ‚Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria‘ (Rev.6, 2015). In the Trautzl-test Imidoxim had an explosive power under high confinement. Therefore the acceptance procedure for “Class1 explosives” needed to be applied (UN GAP-, Koenen- and the Time/Pressure Test). Imidoxim was not sensitive to detonative shock or did show effects on heating under confinement. Imidoxim was also unable to deflagrate. The results lead to the conclusion that Imidoxim is not “Class 1 explosive” solid. Therefore Imidoxim has to be classified as not explosive.

Description of key information

Imidoxim was not sensitive to detonative shock, did not show effects on heating under confinement and was also unable to deflagrate according to the acceptance procedure for "Class 1 explosives". Therefore Imidoxim has to be classified as not explosive.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

At a heating rate of 3 K/min, an exothermic reaction started at 183 °C with a heat release of about 920 kJ/kg. Based on this thermal behavior it was expected that the substance could be explosive. Because the oxygen balance was -195.5, testing according to UN-MTC test procedure was necessary. Investigations of explosive properties were performed according the UN-Standard ‚Recommendations on the Transport of Dangerous Goods - Manual of Tests and Criteria‘ (Rev.6, 2015). In the Trautzl-test Imidoxim had an explosive power under high confinement. Therefore the acceptance procedure for “Class1 explosives” needed to be applied by UN GAP-, Koenen- and the Time/Pressure Test.

Justification for classification or non-classification

Imidoxim has to be classified as a non explosive solid.