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Reference
Endpoint:
explosive properties of explosives
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Study starting date: 2017-09-14; Experimental starting date: 2017-09-21; Experimental completion date: 2018-01-19
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
UN Manual of Tests and Criteria: Part I: Classification procedures, test methods and criteria relating to explosives of Class 1
Qualifier:
according to
Guideline:
other: OECD 113 (1981) Screening Test for Thermal Stability and Stability in Air
GLP compliance:
yes (incl. certificate)
Key result
Parameter:
other: energy (J/g) thermal stability by differential scanning calorimetry
Value:
-440
Key result
Test series:
UN Test series 1
Method:
UN Test 1 (b): Koenen test
Parameter:
limiting diameter (mm)
Value:
1
Result:
negative, no explosion
Remarks on result:
no ignition, explosion, self-heating or visible decomposition

The DSC runs PN14350, PN14357 and PN14423 in a closed glass or gold-plated stainless steel crucible are shown in the table below.

In the measurements using a glass crucible no significant thermal effects could be observed due to the strong noise of the DSC signal. For this reason an additional measurement in a gold plated stainless steel crucible up to a temperature of 500 °C was performed. Starting at a temperature of 350 °C anexothermic effect with a decomposition energy of >-440 J/g was observed. Because of the test end at 500 °C the exothermic effect was not fully recorded and the associated energy release cannot be fully quantified. Because of the shape of the signal an energy release of >-500 J/g has to be assumed.

The results of the DSC-measurements are summarized in Table 1.

Table1:    Results of the DSC-measurements

No.

Crucible
material

Sample weight / mg

Start of effect / °C

Energy / J/g

PN14350

Glass

6.66

-

-

PN14357

Glass

7.99

-

-

PN14423

Gold

4.94

350

>-440 (exothermic)

Due to the fact that the decomposition energy is above the threshold of -500 J/g the Koenen- and the Time-Pressure-Test had to be performed.

Three tests with a 1.0 mm diameter orifice plate were performed.

Table2:    Results of the Koenen-Test

No.

Sample weight / g

Diameter orifice plate / mm

Reaction time t1 / s

Reaction time t2 / s

Reaction

Appearance of tube

1

27.52

1

 

> 300

t1: sparks

Unchanged

2

27.50

1

 

> 300

t1: sparks

Unchanged

3

27.52

1

 

> 300

t1: sparks

Unchanged

t1: time to first reaction: sparks
t2: time to main reaction: no reaction

Due to the fact that the test series with a1.0 mm diameter orifice plate showed no explosionthe UN-Transport Regulation Test 1(b) and Test 2(b) deemed to be “–“.

Table3 summarizes the results of the three tests.

Table3:    Results of the Time-Pressure-Test

 

Test 1

Test 2

Test 3

Time [s] at 690 kPa

Not reached

Not reached

Not reached

Time [s] at 2,070 kPa

Not reached

Not reached

Not reached

Time for pressure rise [s]

-/-

-/-

-/-

Due to the fact that the test item did not reach a pressure of 2070 kPa,the UN-Transport Regulation Test 1(c) and 2(c) deemed to be “-“.

Interpretation of results:
other: non-explosive
Conclusions:
In the DSC-measurement the energy of the exothermic decomposition of the test item was potentially above the threshold of -500 J/g. Therefore, further tests for explosive properties had to be performed.

In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2, the test item showed no explosive properties.
Executive summary:

In the DSC-measurement the energy of the exothermic decomposition of the test item was potentially above the threshold of -500 J/g. Therefore, further tests for explosive properties had to be performed.

In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2, the test item showed no explosive properties.

According to the results of the test on thermal stability and explosive properties, the test item is classified as following:

UN Transport Regulation: The test item does not have to be classified as explosive substance in class 1 according to the UN Transport Regulation.

GHS (CLP Regulation EC 1272/2008: Annex 1: 2.1): The test item does not have to be classified as explosive substance according to GHS or CLP Regulation EC 1272/2008 Annex 1: 2.1, respectively.

This study was GLP compliant and followed UN Recommendations on the Transport of Dangerous Goods:
Manual of Tests and Criteria, Rev. 6 (2015) andUN-Model Regulations, Rev. 20 (2017)
. The study was given a reliability rating of 1 (reliable without restrictions).

Description of key information

In the DSC-measurement the energy of the exothermic decomposition of the test item was potentially above the threshold of -500 J/g. Therefore, further tests for explosive properties had to be performed.

In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2, the test item showed no explosive properties.

Key value for chemical safety assessment

Explosiveness:
non explosive

Additional information

This study was GLP compliant and followed UN Recommendations on the Transport of Dangerous Goods:
Manual of Tests and Criteria, Rev. 6 (2015) and UN-Model Regulations, Rev. 20 (2017)
. The study was given a reliability rating of 1 (reliable without restrictions).

Justification for classification or non-classification

In the DSC-measurement the energy of the exothermic decomposition of the test item was potentially above the threshold of -500 J/g. Therefore, further tests for explosive properties had to be performed. In the test on explosive properties according to UN Transport Regulation, Test series 1 and 2, the test item showed no explosive properties.

This study was GLP compliant and given a reliability rating of 1 (reliable without restrictions).